plywood power catamaran

MIKE WALLER 

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The Skoota 28 is a 28 ft plywood demountable coastal cruising power catamaran for a couple. Ideal for the European canals, the PNW or the Great Loop. It will demount for transport on a flat bed lorry/truck or could even be towed by a large car but should not be considered “trailable”. When disassembled it does not need a “wide load permit” for transport

Design Specifications

Richard Woods of Woods Designs [email protected] www.sailingcatamarans.com

Foss Quay, Millbrook, Torpoint, Cornwall, PL10 1EN, UK

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Boat Profile

Eco 5 Power Cat

A catamaran for cozy cruising

From Issue   Small Boats Annual 2017 March 2016

W as it time for another boat? In the 1980s, it was a 16′ sailing dinghy that awakened my wife Barbara and me to the beach-cruising pleasures of the San Juan Islands in Washington’s Puget Sound. In the ’90s, it was a 19′ lug-rigged double-ender for oar, sail, and outboard that extended cruising to Desolation Sound. Then came a 20′ catamaran, sporting a wing mast with square-topped mainsail, that got us inside a comfortable cabin while offering exciting sailing in moderate conditions. But as years went by, sitting out in the weather and hauling sheets took its toll. Sailing was exciting when the wind was up, but boring in light summer winds. Why bother with sailing if we could motor at 10 knots? Was it time for a gasser?

And so it was, and we decided upon the Eco 5 Power Cat by Bernd Kohler in France. Its narrow hulls, wave-piercing bows, space-age profile, and three-tone color scheme really made it a looker. At 5.5 meters, it was about the same size and accommodation as our 6-meter sailing cat, and still trailerable behind our compact SUV. The twin 5-hp outboards specified in the plans were to drive the EcoCat at an economical 10 knots and spin it around in circles. Having them mounted on the transoms should eliminate weed pickup, as well as the between-hull wave buildup working against a centrally mounted outboard. I ordered plans, and the digital files came quickly via email.

The plywood-on-frame EcoCat is simply built, using chines sprung around widely spaced bulkheads. I opened the DXF files on an older Mac Cube still running Drawing Board CAD from Ashlar Vellum. With CAD, I made some design changes for a bit more cabin headroom, bigger windows, storage lockers forward, and extended cockpit sides complementing the cabin profile.

The Eco Cat rests comfortably on the cobbles between tides. There’s room aboard for an inflatable kayak when a dinghy is required if the Cat’s at anchor.

Once I had the design tuned to suit our needs, I nested parts for economical use of plywood sheets, created a tool path for the ShopBot CNC router I’d used for our rowing-shell kit business, and quickly cut out the parts from 6mm plywood. It sounds complicated, but it’s actually similar to laying out parts by hand—but with parts cut far more accurately, with beautiful, fair, and smooth curves everywhere. I milled clear Sitka spruce to dimension, scarfed it to full lengths, rounded edges, and precoated everything with epoxy. This self-made “kit” made for very fast building.

The building jig had only one temporary form; all other forms were bulkheads that remained with the hulls. The hulls were built upside down, planked, and even finish-coated with graphite-infused epoxy—later I’d paint above the waterline. The 6mm planking was patterned on the hull, as the actual faired shape may be a bit different from a CAD plate expansion, then glued in place and trimmed. The hull and side-panel sections were joined with butt blocks that added stiffness in way of the temporary bulkhead. After I flipped the hulls upright and aligned them, I fit the deck—scarfed 12mm plywood. The cabin sides and top were built up with two layers of 4mm ply. It took just four months for me to complete the construction of the hulls and cabin.

The partially finished boat looked great, and I decided to spend the big money for a two-part paint sprayed on by a professional, thinking it would be done quickly. Wrong. It was another six weeks before the boat was back for outfitting. The plans showed a windscreen here, a galley there, a steering wheel, and twin outboards—but no details. It was just another challenge to work through.

The two small outboards were a good fit for the twin hulls, but didn’t provide adequate power.

Remote steering and motor controls for twin outboards is very routine for a monohull, but not for tiny twin 5-hp outboards on a catamaran! Time to improvise. A tiller bar, supported on nylon bushings, was hidden in the cross beam with a mechanical steering cable connected to the dash-mounted steering wheel. What a challenge it was just to have twin motors on a little catamaran.

Another professional I hired designed an excellent canvas dodger, back panel, and semi-rigid windscreen that really complemented the design. Barbara and I could now cruise, completely protected from wind and rain, sitting in comfortable captain’s chairs. The 6′ x 8′ cockpit is our living room at anchor, doubling the EcoCat’s enclosed space. A Yeti cooler, good for five days, stays in the cockpit as a table or extra seat. An Origo two-burner alcohol stove eliminated complicated propane systems. We use a lightweight 32-amp-hour starting battery, not for the pull-cord-start outboards, but for powering LED lighting and an iPad for music and charts with the Navionics app. We only need the instruments powered up while we’re under way, so the outboards’ 6-amp charging outlets supply power directly to the instruments and charge the battery at the same time. No shore power is needed. Simple systems for a simple boat—its name, JUST ENUF, serves the cat well!

The Cat’s shallow draft and twin hulls open up options for anchoring in shallow coves. If the bottom is even and not too rocky, grounding out during a midnight low tide isn’t a problem.

D uring the boat’s first season we took a two-week cruise to British Columbia’s Broughton Islands. The cruise covered hundreds of miles, and we alternated between being the only boat in a secluded cove and being surrounded by the warm hospitality of wilderness float marinas. A comfortable 80-mile range and top speed of 10 knots allowed us to do plenty of exploring without concern for time or fuel. The EcoCat is comfortable in sea conditions of 2′ short, steep chop and can confidently deal with far rougher conditions.

Having the lines of the Eco Cat in CAD files simplifies making alterations like raising the cabin roof to provide standing headroom.

This 8′-wide catamaran offers the stability and seakeeping of a far larger boat. There’s never a problem grabbing for a hot pan when another boat, zipping by to look at JUST ENUF, leaves its wake for us. There is plenty of room with a hanging locker and two cuddies for each person. Sleeping bags with integrated mattresses make a very comfortable double. When bags are folded over during the day, the large padded bridge deck area is very comfortable for sitting, cooking, and just hanging out. The starboard hull has a cushioned canoe seat atop the porta-potti. Just forward is hull storage for an inflatable kayak or two folding bikes and other bulky gear. The port hull has standing headroom at the sink and sit-down room for meal preparation with a flip-down table for dining.

A single 20-hp outboard can outperform twin 5-hp outboards. Just behind the motor’s shaft you can see one of the extensions added to the hulls to improve the trim with the greater motor weight. The custom-made canopy doubles the Cat’s sheltered space.

The twin 5-hp outboards proved to be not enough power. They had no top-speed potential, pull-cord starting, and were noisy, especially with the steering linkage rattling between them. Worse, the tiny props had so little bite that docking maneuvers were a constant challenge. A repower with a single Yamaha 20-hp outboard yielded a 10-knot cruising speed, 15-knot top speed, and the same fuel economy as the twin 5s: 1 gallon per hour at any speed. Electric start, 6-amp charging capability, and a lightweight battery competed the package. A 1′ extension added to the stern of each hull helped offset the additional weight of the larger motor and its under-deck 12-gallon fuel tank. Docking was no longer embarrassing, and we could now talk while running 10 knots. The rougher the water got, the faster and smoother we would go. Life was good.

A hatch in the foredeck provides access to the bow for anchoring.

But as most of the weight was still aft with either engine arrangement, the EcoCat still squatted underway. One day, Mike Snook—experienced with super-large, high-speed Australian catamarans—suggested transom wedges and end plates as the cure. A 1″ x 4″ wedge was added like a trim tab to the each stern with skeg-like end plates added in line with the sides of the hull to contain the flow. The cat’s tracking was better, even with the previous centerline skegs removed. Trim was now level with clean entry and a very smooth exit. After a prop change, we had the same top speed with cruise speed reduced by 400 rpm for a noticeably quieter boat.

Outboards are designed to mount behind a transom with only the prop exposed below the hull. When centrally mounted on a catamaran, all of the lower unit below the bridge deck is exposed to bow wave convergence with lots of unwanted spray and, perhaps, added drag. We had tried several ideas on previous sailing catamaran but solved the problem on the EcoCat with a hull-mounted streamlined fairing that lets the motor think it’s on a transom.

The EcoCat is quite at home in the broad reaches of Puget Sound that lie in the shadow of Mount Baker.

T he 10-knot cruise speed for our typical three-day, 50-mile round-trips lets us enjoy island life and not lose one day getting somewhere and another getting back. That’s the advantage of a gasser. It’s all about the destination, hanging out, enjoying a nice hike, being in a special place, especially for my wife Barbara and me. My solo trips continue to range farther and wider in all weather conditions.

Ron Mueller continues to design and build small boats and still rows most days in Bellingham, Washington. He started whitewater kayaking in the late ’60s, sailing in mid ’80s, and rowing in the ’90s when he founded Wayland Marine. Ron designed and built the Merry Wherry kits and was the Northwest dealer for Alden Ocean Shells and Echo Rowing until retiring in 2010.

Eco Cat Particulars

LOA/ 18′ (5.50m) Beam/8′ 2.4″ (2.50m) Draft/8.7″ (0.22m) Weight/606 lbs (275 kg) Capacity/1350 lbs (620 kg) Power/15–20 hp Construction/Approx. 400 hours

Plans for the EcoCat , with a digital manual and 16 pages of drawings as BMP or DFX files, come from Bernd Kohler at K-designs . A kit is also available.

Is there a boat you’d like to know more about? Have you built one that you think other Small Boats Monthly readers would enjoy? Please email  us!

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Comments (27)

I would really like to see a drawing of the modifications mentioned in the text. It sounds like the end product was significantly different from the original design.

Tim, JUST ENUF is built exactly to the furnished plans. Obvious additions were the cockpit sides and transom extensions when repowering. Plans are furnished as DXF files which may be printed out for “manual parts layout” or modified in CAD for CNC cutting. I hope this helps.

Form definitely follows function on your well built boat. The 20-hp outboard was a great idea and so were all of the modifications to get everything right.

Pete, thanks for your kind thoughts. Looking forward to seeing you on a Salish Sea beach soon!

I really enjoyed the article in the March issue of Small Boats Monthly about Ron Mueller’s JUST ENUF. Ron’s boat never fails to draw all kinds of attention when he’s pulled out on the beach or running with a group of other boats up here in the north Puget Sound, and looking carefully at his superlative build, one can easily see why. Though I am somewhat of a “traditionalist” at present, this boat looks like it could very well be in my build list sooner rather than later!

I love seeing articles from other Salish Sea folk. The photo with Mount Baker (Komo Kulshan is the name given to it long ago by the Lummi people) in the background is part of my life.

Vince, twins seem desirable but two 8.5-hp motors would use noticeably more fuel then a single 17-hp motor. Remote control would lend itself to a autopilot but complicated. Remember that each catamaran hull has a different turning radius in a turn. My previous sailing Jarcat had rudders set up with Ackerman steering (like a car). That’s probably not really needed for outboards. Just a thought.

I like the look of this craft. What would be the result if you went to twin 8.5-hp outboards which have the electric start and hardware to do twin rigs with remote control? Still the design appears to have a lot going for it. Enjoy it!

I’m just wondering if the deadrise at the end of each original hull was maintained on the 1′ extensions and if so, how the trim tabs were installed.

Mike, deadrise was just flowed out. The trim tabs are a solid wedge at the end of the hull about 4″ long and 1″ thick. An end plate (in line with hull side) contains the water flow for greater effect. The end plate is a skeg-like shape about 12″ by 4″ that provides better tracking than the original skegs on the keel centerline.

Most of the changes Ron made to the design—the hull extensions and other modifications—are incorporated in the plans. There are many ECO’s sailing world wide and it is my policy to update the plans to improve my designs. That applies not only for my ECO line of boats, but the others as well. By the way, I leveled out the deadrise of the extension to 0°.

Do the plans show the unique assembly method in case a builder wanted to have the parts CNC cut? Is the interior of the cabin also coated with epoxy?

Most parts were pre-coated and sanded (at least one side) prior to assembly. The plans are DXF files for display and would need to be, at least, nested for a CNC tool path prior to cutting. After importing to a CAD program, I added an inch in cabin height. Enlarged the windows, laid out cubby holes in the forward bulkhead and designed the cockpit sides with the same curvature used for the cabin. This is a real timesaver and provides great accuracy when having symmetrical parts and provides very smooth curves. The planking and cabin top is best (and easily) laid out directly on existing structure rather then CNC cutting. The construction was completed in just four months while attending to my normal business of selling rowing shells and making kits of same. Painting and canvas was “sent out” and fitting out was, at least, another month.

Thank you very much.

What is the contraption mounted on the forward hatch?

It’s a Nicro Solar Vent Fan. It runs mostly 24/7 as long as its self-contained battery is charged. There is enough leakage through the companionway hatch to keep the cabin dry during winter storage and summer nights when we’re sleeping aboard. We usually slide the main hatch open an inch or two at night (the dodger protects it from rain), and latch the foredeck vent hatch open rather the use the fan. Although fans may be quiet at first, they do develop a bit of noise after a few years.

I did some measuring. I wouldn’t have the ceiling height to flip the hulls over. Is there a real problem building them separately?

Walter, good news, the hulls are built separately. While the hulls were still upside down, I coated them with three coats of epoxy mixed with graphite powder. Those are the black surfaces in the video. This graphite/epoxy mix becomes “bottom paint” and is quite UV resistant, and does not need further painting.

The hulls are then rotated upright, aligned, and a 1/2″ plywood deck is glued to join both hulls. Everything else is built up from this deck—no need to turn the boat over! All of the painting is done from the waterline up. You could paint the bridge deck underside and inner hull sides while the boat is on a trailer.

What brand of windlass was used on JUST ENUF?

An 11-pound Bruce anchor with 10′ of chain is quite easy to haul with an arm-power winch while standing in the forward hatch.

I was looking at the thing below the hatch. Again, thank you.

Appromately how many sheets of plywood were CNC cut?

CNC cutting was used for all bulkheads, frames, cabin sides, cockpit sides, and interior trim— perhaps 10 sheets. The advantage of CNC is symmetrical parts, identical parts for both hulls and very smooth curves and cutout radius. When I had it (now retired six years), my ShopBot was the power tool of choice. Whatever I drew, I could cut and it would fit! Really miss it for my infrequent annual boat building project.

PS: The “thingy” below the hatch was a simple anchor bow roller.

Thank you very much for the information. I have found a local shop that has two ShopBot machines with the capacity of 66″ x 122″.

Greetings Ron, and congratulations on a well built project with very intelligent, yet simple modifications. My question is: Why were not twin 10-hp outboards considered when the twin 5s were insufficient instead of the single 20? Weight, perhaps? And could not the weight vs performance equation also be solved with transom trim tab re-engineering or re-positioning of gas tanks, etc? Love this boat. I am in Biscayne Bay, Forida. We get a chop, we get wind, squalls, hurricanes, etc. It’s a very open bay, but then we get to cruise to the Keys, the Everglades archipelagos, and a million places to explore and gunkhole. I have owned several sailboats here, all with retractable keels—a must if you’re on the bay and want to get off the beaten path of all the Olympic and Biscayne Bay Yacht Racing Association regattas.

Twin 5’s were specified as it was to be a EcoCat. The Honda 9.9 weighs on or about 100 pounds. The Honda rep insists that a single outboard (equivalent in HP to two twins) will always be more economical. I’d suggest today’s best choice would be a Suzuki 25, about the weight of the Yamaha 15/20. It’s said to be more economical and quieter. They sell a 30 (same block size) in the US but it only comes with power trim/tilt so the bracket would be dragging in the water. I hope this helps.

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2023 Power Buyer’s Guide

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Dismantlable and transportable

A dismantlable powercat can be transported on a simple flatbed trailer... as long as it is of reasonable length and light in weight. Naval architect Richard Woods was able to test the validity of the concept with his own Skoota 28: the Aegean 30 is a development of the Skoota 28, still for building in plywood/epoxy and dismantlable. The objective was to increase the beam - now close to that of a sailing catamaran - and the headroom while offering two additional berths in the hulls. The outboard motors make beaching easier and safer - no rudders and engine legs. Two 40 to 60 HP engines guarantee a cruising speed of 10-12 knots (16-20 knots top speed).

Architect: Richard Woods Design  Material: Epoxy plywood Overall length: 30’2” (9.20m) Waterline length: 289’ (8.85 m) Beam: 16’5” (5.00 m) Draft: 14” (0.36 m) Headroom in nacelle: 6’3” (1.90 m) Light displacement: 5,500 lbs (2.5 t) Laden displacement: 7,000 lbs (3.2 t) Engines: 2 x 40 to 60 HP outboards  Cruising speed: 10/12 knots Max speed: 16/20 knots

L925 SEMI DISPLACEMENT POWER CAT

Amateur or professional construction in plywood/epoxy.

New Zealand-based naval architecture firm Dan Leech is offering a number of power multihulls from 25 to 60 feet (7.5 to 18 m) for amateur or professional construction. Among them, the L925 is the perfect choice for relaxed cruising for a couple. This model is built in ½” (12 mm) plywood - the panels can be digitally cut - with glass/epoxy reinforcements. Its limited beam will allow you access to a marina slip without any noticeable extra cost. On the other hand, the gain in habitability and stability is considerable compared to a single-hulled motorboat. This kind of construction is very accessible to an enlightened amateur (4,000 hours of work were counted for the first model) all the more so as having outboard motors for propulsion considerably simplifies the technical aspects. Despite its semi-displacement hulls, the L925 is capable of making more than 20 knots with two 90 hp engines.

Construction: Amateur or professional Architect: Dan Leech Naval Architect Length: 30’4” (9.25 m) Waterline length: 24’9” (7.55 m) Beam: 11’ (3.35 m) Draft: 19” (0.48 m) - engines up Recommended engines: 2 x 90 HP outboards Cruising speed: 17 knots Max speed: 22 knots Fuel: 79 US gal (300 l)

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The ArrowCat 320 is a successful model - now in its third generation. The smallest of the Arrowcat range, it features a luxurious finish - rare in compact powercats - such as a wooden steering wheel, or modern, full instrumentation on a carbon-look dashboard. Inside, the manufacturer has paid particular attention to the owner’s cabin. The 320 is powered by two outboard motors. The limited beam of 10 feet (3.05 m) allows the boat to be transported by road in certain countries such as the United ...

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PERFORMANCE MARINE CRAFT

• Semi-Foiling Power Cat

This is a plywood power cat for a client in Florida who wanted to build his own boat. He was keen to take advantage of Bieker Boats’ foil design experience to get better fuel economy and performance, and also wanted a boat that was distinctively styled.

We started with our little commuter cat  hulls as a template since it has performed so well, and added features suitable to warm weather boating in Florida, like a larger deck, minimal cuddy cabin, forward seating and a permanent hard top for shade and paddle board stowage.

The flip-up main foils combined with the “moustache” foils mounted to the motor drive legs should reduce displacement 40% or so giving faster cruising speed and better stability in a seaway.  The main foils are manually adjustable for trim over ±2 degrees.

Particulars

Construction Details

Primarily 6 and 9mm Okoume BS1088 plywood with West System Epoxy sheathed with E-glass.  The wet deck and hard top are 20mm thick PVC cored carbon composite. Structural reinforcing details in carbon composite.

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Friday, april 24, 2015, kit-build dix 470 plywood catamaran.

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The designs where there is a YELLOW BACKGROUND are the designs for which CUTTING FILES are available.         SEE STUDY PLANS FOR NEW LARGE FLYBRIDGE VERSION.                                                                      - for additional information   HOME / INDEX PAGE   Plans & Kits Plans by type Skoota 18 Power Cat Plans PDF Create New Wish List Description Additional information. About Woods Downloadable Plans Click HERE to download Free Study Plans LOA 5.6m 18ft 4in LWL 5.4m 17ft7in BOA 2.5m 8ft2in Empty weight 320kgs 700lbs Displacement to WL 700kgs 1500lbs Draft max 350mm 14in Outboard engine 9.9-20hp max The Skoota 18 is a simple to build and trail power catamaran. It is based on the Chat 18 sailing catamaran but with extra buoyancy aft to take a bigger engine, up to 20hp. This gives an economic cruising speed around 9-10 knots and top speed in the low teens. The small cuddy offers protection during the day while the boom tent and long cockpit seats mean you can camp on board for a night afloat The boat is built using conventional stitch and glue plywood, build time is estimated at 300 hours. Please email me for more details and basic studypack. Basic Materials List (approx, no allowance for waste or errors) 6mm ply 20 sheets 9mm ply 4 sheets Timber 2in x 1in 40m 3in x 1in 2m 2in x 2in 5m 1.5in x 1in 40m Beams 4in x 2in x 2.5m 5 off glass tape 150m 100mm (4in) wide Sheathing (optional) 60sqm 200g/sqm (4oz) epoxy 20kgs screws 1000 18mm (3/4in) x no6 200 25mm (1in) x no6 st steel cs paint, filler etc as required Related Products Skoota 20 Power Cat Plans Download Skoota 24 Power Cat Plans Download Mini-Cat Plans PDF MaXi The Cat Plans PDF 18' super pelican plans pdf. THE PRINCESS PASSPORT Email Newsletter Yacht Walkthroughs Destinations Electronics Boating Safety Ultimate Boating Giveaway Discover the Top Power Catamarans for 2024 By Yachting Staff Updated: September 10, 2024 Power catamarans have seen a surge in popularity, growing both in size and appeal. These cruise-focused yachts offer homelike comfort, fuel efficiency and user-friendly operation, making them a favorite among avid travelers. Their popularity extends to the bareboat charter market for the same reasons. In this article, we explore the world’s top power catamarans, ranging from a 36-footer ideal for a cruising couple to a 78-footer perfect for entertaining friends and family. The propulsion options are diverse, including outboards, diesel inboards, hybrids, and even all-solar setups. Top Luxury Power Catamarans The following power catamarans are all vessels we’ve reviewed. They are listed in no particular order. Fountaine Pajot MY44 : A family-oriented cat suitable for long-range cruising and aimed at owner-operators.  Silent Yachts 60 : This is a catamaran that can cruise comfortably for long distances using emissions-free solar-electric propulsion. Horizon PC74 : With interior and deck space like a much larger vessel, the PC74 is perfect for cruising the Bahamas and Caribbean. Aquila 36 : This beefy 36-footer is an outboard-powered, express-cruiser-style catamaran. Lagoon Seventy 8 Powercat : A spacious design, this vessel fits the volume of a 130-foot-long monohull into just 78 feet of length overall.  Horizon PC68 : This cat has a stable ride, long range, volume to spare and intriguing layout options. Two Oceans 555 : An elegantly simple yet luxurious 55-foot custom with the space and amenities of a much larger vessel. Lagoon 630 : From its open salon to its spacious decks, the Lagoon is a comfortable and luxurious platform. Fountaine Pajot MY5 : A midsize cruiser with serious big-boat space for family and friends.  Prestige Yachts M8 : The voluminous 65-footer lets owners customize onboard spaces. Aquila 47 Molokai : Calling all anglers: This cat has 60-plus-knot speed and is set up for serious bluewater adventure. Fountaine Pajot MY44 The  Fountaine Pajot MY44 , a creation of Italian architect Pierangelo Andreani and French designer Daniel Andrieu, has a main deck that’s open from the aft-deck seating all the way forward to the starboard helm station. The sense of spaciousness is significant, for several reasons. First, four glass panels aft can all slide to port, creating an indoor-outdoor space with the aft deck and salon. In the salon, 32-inch-high windows extend for 12 feet down the sides of the yacht, with three sections per side, bringing in natural light along with the three forward panes that comprise the windshield. Finally, 6-foot-6-inch headroom provides vertical clearance, with a 21-foot-7-inch beam that adds interior roominess while keeping the yacht stable. Quick Specifications 44’ 21’5” 530 gal. 184 gal. 6’6” 32,850 lb. Silent Yachts 60 Solar panels, ocean-crossing range and self-sufficiency define the electric Silent-Yachts 60 power catamaran. If there was any question that the “Tesla moment” has arrived in yachting, the Silent 60 clearly provides a positive response. Consider, for a moment, crossing oceans in silence at 5 to 6 knots without consuming a drop of fuel and never needing to plan your course between fuel stops. Imagine sitting at anchor and running the air conditioning all night, not to mention all the galley appliances plus the washer-dryer, without the hum or fumes from a genset. 62’ 29’6” 4’5” 68,000 lb. Horizon PC74 As founder and director of The Powercat Company, a Horizon Power Catamarans distributor, Stuart Hegerstrom had long believed that catamaran builders needed to design their yachts to more stylish standards. “The boats were very boxy,” he says, based on his years of experience with cats in the charter market. He and his partner, Richard Ford, asked Horizon to produce models that had high-end finishes and looked good inside and out. The Horizon team brought in mega-yacht designer JC Espinosa to work with its own craftsmen. The result aboard the  Horizon PC74  is a catamaran with exterior styling, layout and functionality that should appeal to private and charter owners alike. 73’9” 28’3” 2,000 gal. 400 gal. 6’ 163,140 lb. The Aquila 36  is a departure from her sisterships in that she is an outboard-powered, express-cruiser-style catamaran, but she also adheres to MarineMax’s philosophies. With a single main living level from bow to stern and a beam of 14 feet 7 inches, the Aquila 36 is like a bowrider on steroids. She has seating that can handle 20 adults for outings and barbecues, and there are two staterooms below, one in each hull, for family weekending. The staterooms have nearly queen-size berths, en suite heads, stowage and 6-foot-6-inch headroom. 36’ 14’7” 356 gal. 200 gal. 2’ (engines trimmed up) 21,572 lb. Lagoon Seventy 8 Powercat Lagoon is a division of Groupe Beneteau, the world’s largest builder of sailing yachts, and the  Lagoon Seventy 8 Powercat  is a developmental sistership of its Seventy 7 super sailing cat. The Seventy series yachts are built at Construction Navale Bordeaux in France, which had to add a new yard to construct these catamarans because they require separate stern molds for the power and sail versions. 78’1” 36’1” 2,246 gal. 422 gal. 4’2” 131,153 lb. Horizon PC68 Multihull yachts ride differently than monohulls, often counteracting the sea’s motion for a smoother, more stable ride. On the Horizon PC68 , sharp hull entries make head seas seem gentle, and a Humphree stabilization system with blades reduces roll. Horizon uses SCRIMP construction for resin saturation that maximizes strength with an 111,112-pound displacement. And with a 5-foot-4-inch draft, the PC68 invites island cruising. 60’9” 24’6” 1,000 gal. 250 gal. 4’9” 83,467 lb. Two Oceans 555 With 27-knot speed, house-like volume, an on-deck master and top-tier tech, the Two Oceans 555 is a formidable power catamaran. Dave Jirikovic of HMY Yachts was on a quest. The sales broker was looking for the meanest, nastiest patch of Gulf Stream he could find to show a potential client what the Two Oceans 555 power cat could handle. And just as he had intended to show us, the broad-shouldered power cat didn’t even notice. He even dropped the single-lever throttles back to idle and left the 25-foot-wide Two Oceans 555 beam-on to another set of square-edged seas. The 55-footer brushed that off too. Jirikovic tried quartering into the seas—never a happy angle for catamarans—and the yacht drowsed through them. 55’6” 25’ 750 gal. 200 gal. 49,600 lb. Fitted with the optional twin 300-horsepower Volvo Penta D4 diesels, the  Lagoon 630 MY  burns only 1.64 gph total at 6 knots, giving a theoretical range of 2,952 nautical miles with standard tankage of 793 gallons. Hull No. 1 had an optional 502-gallon tank, giving it transatlantic range. Luxury, stability and economy are all hallmarks of Lagoon’s return to luxury motor yachts. If you can take a ride, it will be worth your time. 64’ 32’10” 793 gal. 254 gal. 3’11” 70,097 lb. Fountaine Pajot MY5 The flybridge deck on the Fountaine Pajot MY5 is a standout feature, offering virtually unobstructed 360-degree ocean views and an elevated beach club vibe. Aft of the off-center starboard helm is a spacious area perfect for entertaining, complete with a wet bar, refrigeration center, and ample seating. It’s the most popular space aboard according to the builder. And if the weather turns for the worse, a second helm station in the saloon allows the skipper to pilot the MY5 in climate-controlled comfort. 42’4” 19’9” 372 gal. 112 gal. 3’7” 46,000 lb. Prestige Yachts M8 How fitting it was that Prestige Yachts introduced its new M-Line flagship, the M8 , at Portopiccolo, a picturesque yachting village outside Trieste, Italy. Formerly a quarry, the cliff-side area had been chiseled into a clean site rife with eye-catching vistas, much like the French builder’s 65-foot power catamaran and its nearly 3,000 square feet of usable real estate. 65’ 29’ 978 gal. 224 gal. 5’5” 98,379 lb. Aquila 47 Molokai With every boat, there’s an origin story. In the case of the Aquila 47 Molokai power catamaran, it starts with MarineMax, which saw people renting boats for bareboat charters. MarineMax Vacations was born. After experimenting with several production yachts, the company decided to build its own: the Aquila line, designed for charter as well as for sale to owner-operators. 49’4” 14’7” 1,048 gal. 2’2” (engines trimmed up) 22,818 lb. More: Aquila Boats , Fountaine Pajot , Horizon Power Catamarans , Lagoon , Lagoon Catamarans , Power Catamarans , Prestige Yachts , Silent-Yachts , Two Oceans , Yachts More Yachts Alia Yachts to Debut SAN Superyacht in Monaco Coming Next Year: Tiara Yachts 56 LS Top Nine Fishing Tenders For 2024 First Look: Meet the Apreamare 88 Motoryacht Flagship Top Bar Harbor Maine Sights For Visiting Cruisers Always In Style: Ocean Alexander 85E For Sale Spend Thanksgiving on a Yacht Digital Edition Customer Service Privacy Policy Terms of Use Email Newsletters Cruising World Sailing World Salt Water Sportsman Sport Fishing Wakeboarding Log in or Sign up You are using an out of date browser. It may not display this or other websites correctly. You should upgrade or use an alternative browser . Plywood Catamaran – Frames Discussion in ' Multihulls ' started by APP , Jun 13, 2012 . APP Junior Member Plywood Catamaran – Frames I am considering a Cat 8-9 m long to be made by plywood. I am searching a site with a construction description of such a Cat. Namely I would like to know: - Type of Plywood used - Thickness for underwater and above water plywood parts. - Kind of wood for the frames (Hull and Bridgedeck). Plywood or timber and what kind of timber. -Dimensions of the Frames in plywood or timber (spacing, thickness, web). -The total weight of the particular Cat. Am I asking too much? Thanks for any reply. APP   Mick@itc Junior Member Hi Try Dudley dix's site, he has designs and materials lists. Regards Mick   gonzo Senior Member You are asking for construction plans. You usually get partial information only for free. The plans are a small fraction of the total cost and the worst part to save money on.   ImaginaryNumber Imaginary Member APP said: ↑ Plywood Catamaran – Frames I am considering a Cat 8-9 m long to be made by plywood. I am searching a site with a construction description of such a Cat. Namely I would like to know: - Type of Plywood used - Thickness for underwater and above water plywood parts. - Kind of wood for the frames (Hull and Bridgedeck). Plywood or timber and what kind of timber. -Dimensions of the Frames in plywood or timber (spacing, thickness, web). -The total weight of the particular Cat. Am I asking too much? Thanks for any reply. APP Click to expand... upchurchmr Senior Member Gonzo hit it on the head. Buy a set of plans. Everything you asked for is the design of the boat. Pay money to get the knowledge of an expert, or even someone whos boat has held up. You can't really afford to go forward with less than complete information - it costs too much to fix something later. You save in the end. Richard Woods is a good place to start. Go to http://www.duckworksbbs.com/plans.htm for another selection of designers and boats.   yellowcat Junior Member i have ordered Kurt Hughes (google his name) vhs and now on dvd. although i suggest you copy the dvd on your hard drive before it shows defects ... i have to get my vhs out of the garage ... (i dont know if he can send it via email) . this will give you a good idea of the cylinder mold technique. Very informative, it will give you a feel for what you can and cant do. There are other videos on youtube. Erik Lerouge designs are also being praised by a boat builder who built a large cat in epoxy/ply. You may be suprised at the prices for okoume in china 3mm x1200 mm x 2400 mm BS stamped, but you need to buy a container, unless you find a cobuyer who is interest also. I am in the budgeting process for a 60 ft long catamaran (ply/epoxy) i will need aproximately 1000 sheets of ply , i would need to explain what i want to do but 3 x 3 mm is pretty much what i plan to do for the vertical walls (with bulkheads and stringers) and reinforcements at the in-water sections. Cyl Mold is a very fast way of bldg a multihull. For Motivation on wood boats , check multihull mag article (april/may no 152) on James Wharram. I have nearby access to Gurit products (check their web site) i would like to at least buy stuff from them as good neighbor friend, their epoxies , galls, carbons, corecell, etc products are well knowned. I am considering Awlgrip and Alexseal paint systems but the trendy vinyl wraps are getting my attention for outofwater surfaces. Kind of fun and easy to apply (check on youtube).   Gurit sells eglass, not galls ... !!! fingers tired.   Thanks for the replies. Well, I do not think that the thickness of the plywood used is a professional secret. In several cases, I have seen the most used plywood is okoume', For cats 8-14 m, the bottom thickness is usually 18 mm, hull sides 12 mm, walls deckhouse 9-12 mm, bridgedeck floors 12-18 mm. Frames (Hulls+Bridgedeck) either hardwood timber oak, beech, etc. up to 40-50 mm thick or plywood 18 mm using shorter spacings and depending on the structural strength study. In several circumstances plywwod thicknes is added, e.g. to get a 12 mm sheet you may add 2x6 mm sheets. If you find different thickness dimensions or disagree with the above, please post them here. It is good to collect a variety of opinions. Thanks Regards APP   Thanks for the inputs, depending on the scarph or not. If all edges are scarphed, it will behave like a one piece ply. Holes and openings will also dictate the reinforcements. Those thickenesses are also what i hear and heard sailing on ply cats. I would prefer 4 x 3 mm for a total 12 mm with stagered joints or even better some spiral depending on the shape of the hulls. Glass and carbon hybrid reinforcements can be a cost / strength ratio better deal. Elongation factors are to be considered in longer units. I find that if it is not for racing, but still give a good ride, light wood like okoume is interesting at 8 pounds per sheet ... i am inclined to build up a multiply beam rather than adding hard wood (another type of wood and wood behavior) , i have teak and ply on my sailboat but not for the same purpose. Okoume has a poor rot performance check on Noah's boat supplies , they have comparisons if i recall correctly. Noah's is in Canada but plys come from all over, you can consider Greece ply manufacturers heard good comments. Chinese plys are cheap but you may have to buy more for rejects and research for a better manufacturer. My design will be very different from the usual, i lean toward the lighter structures and use 32ft twin masts and kites which are in my opinion a good compromise power/weight/fun/cost/felxibility . Have you checked out Kurt Hughes web site ? It is a must in my opinion. I will build my cat in modules, it will fit in container(s) and can be stored in a 3mx12mx2,4 m garage, the demasting will not require a crane and furnitures will be built with okoume as spare parts for repairs. Most everything will have to have double use, the least amounts of sit and be heavy stuff onboard.   Samnz Senior Member APP said: ↑ Thanks for the replies. Well, I do not think that the thickness of the plywood used is a professional secret. In several cases, I have seen the most used plywood is okoume', For cats 8-14 m, the bottom thickness is usually 18 mm, hull sides 12 mm, walls deckhouse 9-12 mm, bridgedeck floors 12-18 mm. Frames (Hulls+Bridgedeck) either hardwood timber oak, beech, etc. up to 40-50 mm thick or plywood 18 mm using shorter spacings and depending on the structural strength study. In several circumstances plywwod thicknes is added, e.g. to get a 12 mm sheet you may add 2x6 mm sheets. Click to expand... PAR Yacht Designer/Builder APP, you've jumped to several assumptions and we all know what this usually turns out like. You can assume you observations are correct and have a pig or you can do the calculations and have a nice preforming craft that falls within the scope of your SOR. Judging by your questions, you haven't the foggiest idea about scantlings (hence the inquiries), nor the engineering and calculations necessary to extrapolate them, again within the realm of your SOR. Given this, you have three choices, guess and hope for the best (good luck with that) or buy a set of plans where the calculations have already been preformed or lastly, spend a few years studying structural engineering and hydrodynamics. If you elect to just "go for it" you'd be wise to fine tune you scantlings "observations" in regard to the craft you've looked at. Your remarks about "typical" multi hull scantlings aren't even close frankly, so it would be best to stay very closely to known build schedules. Buying plans would be the logical route.   sabahcat Senior Member APP said: ↑ Thanks for the replies. Well, I do not think that the thickness of the plywood used is a professional secret. In several cases, I have seen the most used plywood is okoume', For cats 8-14 m, the bottom thickness is usually 18 mm, hull sides 12 mm, walls deckhouse 9-12 mm, bridgedeck floors 12-18 mm. Frames (Hulls+Bridgedeck) either hardwood timber oak, beech, etc. up to 40-50 mm thick or plywood 18 mm using shorter spacings and depending on the structural strength study. In several circumstances plywwod thicknes is added, e.g. to get a 12 mm sheet you may add 2x6 mm sheets. If you find different thickness dimensions or disagree with the above, please post them here. It is good to collect a variety of opinions. Thanks Regards APP Click to expand... guzzis3 Senior Member http://sailingcatamarans.com/satmatlist.htm Mr Woods Saturn materials list. Freely available online. There you go. Several others in the same size range on his site. Those are typical for that size boat. Mr Hughes probably goes thinner because he uses cylinder moulding or tortured ply, unsheathed boats might go up a size. If your trying to design your own boat please be careful. Sailing is dangerous and it'd be a pity to kill yourself or people you care for. Mr Woods, Mr Waller and others offer good plans at good prices and excellant backup service while you build. Have fun.   guzzis3 said: ↑ http://sailingcatamarans.com/satmatlist.htm Mr Woods Saturn materials list. Freely available online. There you go. Several others in the same size range on his site. Those are typical for that size boat. Mr Hughes probably goes thinner because he uses cylinder moulding or tortured ply, unsheathed boats might go up a size. If your trying to design your own boat please be careful. Sailing is dangerous and it'd be a pity to kill yourself or people you care for. Mr Woods, Mr Waller and others offer good plans at good prices and excellant backup service while you build. Have fun. Click to expand... Advertisement: The problem you have is that you don't have enough knowledge of boat design to understand the answers we are giving you. The dimensions of the construction materials are called scantlings. They vary enormously depending on the structural design and the type of material. A pine frame needs to be larger than an oak one. However, it doesn't scale directly, but depends on the application. For example, holding power for fasteners may be important. If it is a local stiffener, like in a large deck panel, a soft wood may be more appropriate. Plywood planking will depend on the framing. A hull with light or no framing will need a thicker skin.   Use foam core and plywood in a catamaran hull Plywood Tornado US21 Hull Repair Crowther IMPALLA.... 38 footer epoxy-plywood... plywood racers Plywood boats, can't give them away.... Plywood epoxy Catarmaran Bouyancy need help with a assymetrical cat- plywood and other things RFQ - 6m catamaran hull shape Maxsurf Resistance Catamaran Floating island - Trimaran or Catamaran? No, create an account now. Yes, my password is: Forgot your password? Bear Cat Cuddy Create New Wish List Description Materials and Notes For a PDF study plan download, click HERE CATEGORY: Power Catamarans CONSTRUCTION: Sheet plywood/wood framing, or welded aluminum These longer, wider power cats allow greater displacement, tankage, storage, and load-carrying ability than our WILDCAT design.  Besides the extra room, the wider beam only improves upon the superior qualities of power cats, especially stability.  Based on v-bottom planing hulls, these boats can also absorb higher horsepower motors.  Twin outboards at the higher ratings can provide speed into the 50 MPH range.  Even at the minimum power ratings, planing speeds will range in the mid-to-upper 20's depending on all-up weight. Construction methods in sheet plywood or welded aluminum use amateur-proven techniques similar to our WILDCAT design, but with beefier scantlings in keeping with the boat's greater heft.   Full-size patterns are provided for all hull-forming backbone members and frame contours - lofting is not required.  Nor are any special or esoteric building techniques.  Instructions with hull material listings cover all aspects of the project, and include a fastening schedule with plywood hulls. BEAR-CAT CUDDY features a cabin with walk-around side decks and express-type windshield control station.  In the cabin is sitting headroom above the 6'9" x 4' double berth and space for a portable head. Plywood: FULL SIZE PATTERNS are provided for all hull-forming backbone members and frame contours; no lofting or any special or esoteric building techniques are required. Instructions with hull material listings cover all aspects of the project, and include a fastening schedule. Aluminum: FULL SIZE PATTERNS are provided for all hull-forming backbone members and frame contours; no lofting or any special or esoteric building techniques are required. Instructions with hull material listings cover all aspects of the project. NOTE: When you buy the cuddy version plans, you also receive a complete set of the Sport version plans as well. Aluminum Materials PDF Plywood Materials PDF Related Products Bear Cat Cuddy/Sport Fiberglass Kit Bear-Cat Cuddy Bronze Fastening Kit Bear-Cat Study Plans - PDF Version health related essay upsc business plan course work research paper 362 COMMENTS ECO 75 Power Cat Plans Description. Additional Information. The ECO 75 power cat is the big brother of the ECO power cat. Designed along the same lines and with the same philosophy. Easy to build boat by an amateur. Construction is the time proven plywood/glass fiber/Epoxy composite system. Nothing can match this system for weight, costs and easy of construction. ECO 55 Power Cat Plans ECO 55 Power Cat Plans. The ECO 55 power catamaran is an affordable DIY power catamaran. As the owner proved the boat is a capable coastal cruiser. The inside layout is the same as for the ECO55 sail version but the underwater shape is changed. The cockpit is wider and has a size of 1,45m x 2 m. With the bigger size normal deck chairs can be used. Building a Plywood Catamaran The build process of a 13 foot modular plywood motor catamaranCheck out the boat build project introduction: https://www.youtube.com/watch?v=2nKThZ_bdws-----... Plans For Catamarans And Monohulls Snail Mail: PO Box 900, Morayfield, Qld, 4510, Australia. Email: [email protected]. Mike Waller Yacht Design provides comprehensive boat plans for amateur boat builders. A range of stock plans are available for both monohulls and multihull vessels, constructed in plywood or timber / glass composite. Bear-Cat Sport CATEGORY: Power Catamarans CONSTRUCTION: Sheet plywood/wood framing, or welded aluminum. These longer, wider power cats allow greater displacement, tankage, storage, and load-carrying ability than our WILDCAT design. Besides the extra room, the wider beam only improves upon the superior qualities of power cats, especially stability. Skoota 28 Skoota 28. The Skoota 28 is a 28 ft plywood demountable coastal cruising power catamaran for a couple. Ideal for the European canals, the PNW or the Great Loop. It will demount for transport on a flat bed lorry/truck or could even be towed by a large car but should not be considered "trailable". When disassembled it does not need a "wide ... Building a Plywood Catamaran Building a 14ft plywood motor catamaran - An introduction to the project and showcase of the homemade boat. -----... Wildcat E_X_T Cuddy a 24' cuddy cabin power catamaran. CATEGORY: Power Catamarans CONSTRUCTION: Sheet plywood planking/wood framing or welded aluminum. Now the do-it-yourself boatbuilder can save a bundle and still take part in the revival of the proven power catamaran concept. Our trailerable WILDCAT "E-X-T" CUDDY design offers many benefits for the do-it ... Eco 5 Power Cat Ron Mueller. A single 20-hp outboard can outperform twin 5-hp outboards. Just behind the motor's shaft you can see one of the extensions added to the hulls to improve the trim with the greater motor weight. The custom-made canopy doubles the Cat's sheltered space. The twin 5-hp outboards proved to be not enough power. 2023 Power Buyer's Guide The outboard motors make beaching easier and safer - no rudders and engine legs. Two 40 to 60 HP engines guarantee a cruising speed of 10-12 knots (16-20 knots top speed). Architect: Richard Woods Design. Material: Epoxy plywood. Overall length: 30'2" (9.20m) Waterline length: 289' (8.85 m) Beam: 16'5" (5.00 m) Draft: 14" (0.36 m) Semi-Foiling Power Cat Semi-Foiling Power Cat. This is a plywood power cat for a client in Florida who wanted to build his own boat. He was keen to take advantage of Bieker Boats' foil design experience to get better fuel economy and performance, and also wanted a boat that was distinctively styled. We started with our little commuter cat hulls as a template since ... Kit-build Dix 470 Plywood Catamaran Assembly of the prototype Dix 470 plywood kit by Exocetus Yachts in UK is progressing nicely. This is the second hull, with improvements added into the kit since assembly of the first hull. These photos were sent to me by Exocetus. Exocetus is able to use more advanced methods than would be used by amateur builders but the kit is set up to ... Bruce Roberts, CATAMARAN boat plans, CATAMARAN boat building This CATAMARAN was designed to be built using the FIBERGLASS panel construction & special pre-scaled drawings are supplied for each hull panel making it simple for the builder to build all of the hull and superstructure as one complete unit. This is a POWER-SAILER CATAMARAN .. the bias is about 60% power and 40% sail ... Skoota 18 Power Cat Plans PDF Click HERE to download Free Study Plans. LOA 5.6m 18ft 4in. LWL 5.4m 17ft7in. BOA 2.5m 8ft2in. Empty weight 320kgs 700lbs. Displacement to WL 700kgs 1500lbs. Draft max 350mm 14in. Outboard engine 9.9-20hp max. The Skoota 18 is a simple to build and trail power catamaran. Discover the Top Power Catamarans for 2024 Top Luxury Power Catamarans. The following power catamarans are all vessels we've reviewed. They are listed in no particular order. Fountaine Pajot MY44: A family-oriented cat suitable for long-range cruising and aimed at owner-operators. Silent Yachts 60: This is a catamaran that can cruise comfortably for long distances using emissions-free ... Easy to build catamaran for amateur boat builders Easy to build catamaran ideal for inexperienced amateur boat builders. This easy to build catamaran is intended to allow anyone, no matter their background, to build a modern cruising multihull with a thrilling performance and an appealing design with a small budget. The Bora-Bora 28 has a very practical interior lay-out with accommodation ... Plywood Catamaran Plywood Catamaran - Frames I am considering a Cat 8-9 m long to be made by plywood. I am searching a site with a construction description of such a Cat. ... but depends on the application. For example, holding power for fasteners may be important. If it is a local stiffener, like in a large deck panel, a soft wood may be more appropriate ... Power Catamarans A Word About Power Catamarans. Our POWER CATAMARANS are hard to beat for speed with comfort. In a rough water chop, the air-cushion between the hulls really smooths out the ride. These boats carry heavier loads than other boats and are very stable, making them ideal family boats for fishing, skiing, or cruising. They turn flat with virtually no ... Bear Cat Cuddy CATEGORY: Power Catamarans CONSTRUCTION: Sheet plywood/wood framing, or welded aluminum. These longer, wider power cats allow greater displacement, tankage, storage, and load-carrying ability than our WILDCAT design. Besides the extra room, the wider beam only improves upon the superior qualities of power cats, especially stability. woods janus catamaran July / August Issue No. 299 Preview Now. Janus sailing catamaran. Janus is a 4 berth trailable sailing catamaran built in sheet plywood. However, don't be deceived by Janus' s Power catamaran Moscow Region Rent a Power catamaran in Moscow Region for a fantastic price ⛵ Choose among thousands of charter yachts available online and save money Summer 2021 - over 651 exclusive deals online Best prices - save on average CHF 848 on each booking catamaran gulet motorboat powerboat riverboat trimaran yacht