30'
40'
4.00
4.47
5.48
6.32
12.00
13.42
16.43
18.97
*SLR = speed (in knots) divided by the square root of Waterline Length (ft)
So, below the speed given for SLR=1 and above the speed given for SLR=3.0, the majority of resistance would be directly affected by the roughly 20% increase in the wetted surface for the Vee (or 15% for the Box shape) and if we add in the 5% weight penalty, this could go to about 24%. ( While these percentages might also apply for speeds well under SLR of 0.5 or over 3.5, they would in fact be somewhat less than that at the SLRs listed, as not all the resistance would be due to surface friction )
But between the two values listed, wave resistance grows to a peak at around SLR=2 (for the average multihull) and at this point, the narrower beam of the Vee hulls could lower wave resistance enough to offset the frictional resistance and therefore be quite efficient in the range between the two speeds listed above for each length. The box or Vee'd shape would also offer less leeway and that will also help to compensate.
If we widen the hull at the bottom, the sides can become more vertical and this more box-like section can further lower the wave-making compared to the Vee-section we started out with, as it disturbs the passing waves even less.
Of course, there are other aspects to consider too—like having less interior space at the waterline with the V-hull and also, that the V-hull would initially sink about 15% more for each 100 lbs of extra weight loaded on. The extra draft of a Vee hull is sometimes used as a longitudinal keel to resist lateral drift and that 'might' annul the need for a dagger board or centerboard, although deep fins are clearly more efficient for sailing upwind.
But if you're content to sail in the speed range indicated by the table, which is surprisingly broad, and can accept the other compromises, there's definitely a case for using the box hulls and keeping it simple. Outside of that, expect speeds at around 10% slower at the low end and similar at the much higher end beyond SLR of 3.5.
Of course, even 'ideal hulls' are seldom perfectly semi-circular and the total resistance also depends on many other things, such as the hull ends and even air resistance etc., but this gives a general idea of speed performance for such differing hull shapes, assuming all other factors are alike and comparable. On another aspect, the deeper V-hulls will also have more directional stability but in turn, be harder to tack—helpful for long trips but not for short tacking.
True V-hulls are seldom used for the center hull of a trimaran as they offer so little space. However, they have been used for easy-to-build catamarans and trimaran amas, for owners ready to accept the performance sacrifices noted above. However, the more box-hull can be justified for the sake of easy building. and at least offers more foot space than the narrow Vee'd for a main hull. [Deep, near vertical flat-sided hulls are also drier than Vee'd hulls and have more recently proven to have less wave drag].
Recent tests (2009) on a small prototype trimaran with this Box-hull form and flat bottom, demonstrated that performance can be surprisingly good and some of what is lost through increased wetted surface is indeed made up by the slimmer form. While this may not be true at low speeds (below say 4 kt), the flat of bottom may give enough dynamic lift over at least part of the hull length to offset the theoretically greater surface, and show that the higher speeds of a light trimaran will not be as adversely affected by this box form as one might first think.
Editors Note: For this reason, this simple-to-build form was chosen for the new W17 that has since proven to perform very well indeed. The added resistance at the very low end (say under 4 k) will still be there and will need some imaginative boat trimming and added light-wind sail area to overcome. But for a significant speed range above that, this boat, especially when built to design weight, is proving that the flat underbody surface can indeed offer a very clean running hull with some dynamic lift at higher speeds that some W17 owners are calling 'oiling', as it reportedly feels 'like the boat is running on oil'. Even with the very moderate cruising rig, a speed of 14.9 k has already been recorded (by GPS) in this mode, so this is impressive and promises to offer lots of fun. So for this particular design at least, the high end restriction of a boxy hard chine hull has been overcome by the relatively narrow hull, the flat of bottom and its low-rocker design profile. Compared to a round bilge, the box-hull also offers additional lateral resistance, so the dagger board wetted surface can be slightly reduced for another small speed gain.
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The investigators searching for answers about the shipwreck, leaving seven dead, face questions about extreme weather and possible human error or problems with the yacht itself.
By Alan Yuhas
More than 180 feet long, with a mast towering about 240 feet and a keel that could be lowered for greater stability, the Bayesian luxury yacht did not, in the eyes of its maker, have the vulnerabilities of a ship that would easily sink.
“It drives me insane,” Giovanni Costantino, the chief executive of the Italian Sea Group, which in 2022 bought the company that made the ship, said after its wreck last week. “Following all the proper procedures, that boat is unsinkable.”
But the $40 million sailing yacht sank within minutes and with fatal results: seven dead, including the British technology billionaire Michael Lynch, his teenage daughter, four of Mr. Lynch’s friends and a member of the crew. Fifteen people, including the captain, escaped on a lifeboat.
Mr. Lynch had invited family, friends and part of his legal team on a cruise in the Mediterranean to celebrate his acquittal in June of fraud charges tied to the sale of his company to the tech giant Hewlett-Packard.
The Italian authorities have opened a manslaughter investigation, searching for answers from the survivors, the manufacturer and the wreck itself. They face a range of questions and possible factors.
When the Bayesian sank around 4 a.m. on Aug. 19, the waters in its area, about half a mile off the Sicilian port of Porticello, were transformed by an extremely sudden and violent storm, according to fishermen, a captain in the area and meteorologists.
But what kind of storm is still a mystery, compounded by the fact that a sailing schooner anchored nearby did not have its own disaster. Also unclear is whether the crew was aware that the Italian authorities had issued general warnings about bad weather the night before.
Karsten Börner, the captain of the nearby passenger ship, said he’d had to steady his ship during “really violent” winds . During the storm, he said, the Bayesian seemed to disappear behind his ship.
Severe lightning and strong gusts were registered by the Italian Air Force’s Center for Aerospace Meteorology and Climatology, according to Attilio Di Diodato, its director. “It was very intense and brief in duration,” he said.
The yacht, he said, had most likely been hit by a fierce downburst — a blast of powerful wind surging down during a thunderstorm. His agency put out rough-sea warnings the previous evening, alerting sailors about possible storms.
Locals have said the winds “felt like an earthquake.” A fisherman in Porticello said that he had seen a flare go off in the early-morning hours. His brother ventured to the site once the weather had calmed about 20 minutes later, he said, finding only floating cushions.
The Italian authorities have so far declined to say whether investigators had seen any structural damage to the hull or other parts of the ship.
The boat executive, Mr. Costantino, has argued that the Bayesian was an extremely safe vessel that could list even to 75 degrees without capsizing. His company, the Italian Sea Group, in 2022 bought the yacht’s manufacturer, Perini Navi, which launched the ship in 2008.
Mr. Costantino said that if some of the hatches on the side and in the stern, or some of the deck doors, had been open, the boat could have taken on water and sunk. Standard procedure in such storms, he said, would be to switch on the engine, lift the anchor and turn the boat into the wind, lowering the keel for extra stability, closing doors and gathering the guests in the main hall inside the deck.
At a news conference on Saturday, almost a week after the sinking, investigators said the yacht had sunk at an angle , with its stern — where the heavy engine was — having gone down first. The wreck was found lying on its right side at the bottom of a bay, about 165 feet deep.
12 guests occupied the yacht’s six cabins. There were also 10 crew members.
Open hatches, doors and cabin windows could have let in water during a storm, according to the manufacturer.
Open hatches, doors and
cabin windows could
have let in water
during a storm,
according to the
manufacturer.
Source: Superyacht Times, YachtCharterFleet, MarineTraffic
By Veronica Penney
Water pouring into open hatches or doors could have contributed to the sinking, experts say, but that on its own may not account for the speed at which such a large boat vanished underwater.
Asked about the hatches at the news conference, the authorities declined to comment on whether they had been found open at the wreck.
The authorities have also not specified whether the boat had been anchored, whether it was under power at the time or whether its sails had been unfurled.
The Bayesian had a keel — the fin-like structure beneath a boat that can help stabilize it — that could be retracted or extended, according to its manufacturer. On some yachts, keels can be raised to let the large vessel dock in shallower water, and extended downward to help keep a boat level.
But like the hatches, the status of the keel alone may not explain why a large ship sank with such precipitous speed. Investigators have not disclosed what divers may have seen at the wreck, aside from saying divers had faced obstacles like furnishings and electrical wiring in tight quarters. Officials want to raise the wreck to better examine it, a process that may take weeks.
Ambrogio Cartosio, the prosecutor in charge of the case, said at the news conference that it was “plausible” crimes had been committed, but that investigators had not zeroed in on any potential suspects.
“There could be responsibilities of the captain only,” he said. “There could be responsibilities of the whole crew. There could be responsibilities of the boat makers. Or there could be responsibilities of those who were in charge of surveilling the boat.”
It remains unclear what kind of emergency training or preparation took place before the disaster, or what kind of coordination there was during it. So far, none of the surviving crew members have made a public statement about what happened the night the ship sank.
Prosecutors said they want to ask more questions of the captain and crew, who have been in a Sicilian hotel with other survivors. They said that neither alcohol nor drug tests had been performed on crew members, and that they have been allowed to leave Italy.
Prosecutors also said they were also investigating why the captain, an experienced sailor, left the sinking boat while some passengers were still on board.
Besides possible manslaughter charges, the authorities are investigating the possibility of a negligently caused shipwreck.
The bodies of five passengers were found in one cabin, on the left side of the yacht, the authorities said. The five were most likely trying to flee to the higher side of the boat and were probably sleeping when the boat started to sink, they said.
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The central hull is just over 59 feet long with amas (or outer hulls) on either side that make the total beam nearly 39 feet. It's like a nearly-square speed demon with training wheels. Above: The Rapido 60 Trimaran Sailing Yacht's hull is sleek and sporty design for performance while still being a comfortable long range bluewater cruiser.
Now i know why, but what i didn't know was that trimarans are even faster! Actually, the world record for circumnavigating the world is set on a trimaran. so why is it that trimarans are faster than both catamarans and monohulls. ... Average speed circumnavigating the world: Highest speed recorded* Type of boat: Monohull: 74 Days: 12.16 Knots ...
Trimarans are a little easier, with a single central daggerboard to act as a pivot, and one or other of the floats will generally be clear of the water. On the downside, light displacement means that there isn't much momentum to keep you going through the turn and plenty of windage to stop you. Speed is your friend.
The surprising truth is that a fast cruising trimaran, like the Neel 43 could be the ideal solution ... On turning downwind our speed initially dropped to 6-7 knots at a true wind angle of 150 ...
The word "trimaran" is a portmanteau of "tri" and "(cata)maran", [3] a term that is thought to have been coined by Victor Tchetchet, a pioneering, Ukrainian-born modern multihull designer. [4] Trimarans consist of a main hull connected to outrigger floats on either side by a crossbeam, wing, or other form of superstructure—the traditional Polynesian terms for the hull, each float and ...
NEEL trimarans are built for fast cruising with an average cruising speed of about 10 knots, and are even configured to facilitate that sustained speed under motor propulsion. The NEEL 45 was notably named Cruising World's Most Innovative Vessel in 2013, and by all accounts is an easy-to-sail, high performance boat that is just plain fun.
Speed: Trimarans are known for being faster than cats and single-hull boats. They can easily reach high speeds and are great for racing or long-distance cruising. Stability: Trimarans are more stable than catamarans due to their three hulls. Space: Trimarans are wide, but the interior is less spacious than catamarans.
Considering that trimarans are more stable, you may be better off with one if you're looking to have some fun as you perfect your helming skills. Speed. Speed is another area where trimarans outperform their twin-hulled counterparts. Typically lighter than catamarans, trimarans need less sail distance to hit double-digit speed averages.
The Astus 20.5 has less accommodation than a monohull of similar size. Then there's the speed. No matter whether or not you're in a hurry to get anywhere, it's easier to slow down in a fast boat than to speed up in a slow one. Speed is fun in itself, and it's hard not to enjoy sailing straight past a monohull more than twice your length.
Trimaran vs. Catamaran Speed. In the trimaran vs. catamaran speed debate, the trimaran is the clear winner. For long offshore races, trimarans have become the preferred vessels, and boaters piloting trimarans have won the Jules Verne Trophy in every race held since 2010. This is because of their unique design, which has speed and safety ...
The fastest cruising trimaran to this day is the Maxi trimaran IDEC SPORT. This vessel is both wind or mechanically powered and has completed a voyage around the world in 40 days 23 hours 30 minutes 30 seconds. The Maxi trimaran IDEC SPORT can reach an average speed of 26.85 knots or 30.71 MPH. In addition, this boat has covered a distance of ...
Runner-up: Rapido Trimarans 40. The Rapido 40 is a high tech, all-carbon, performance cruiser with a self-tacking jib, carbon spreaderless mast and an option for a roller furling boom. Walter Cooper. The design brief for the Rapido 40 is straightforward: fast cruising and racing for a couple or crew; ocean-ready but able to sail and moor in ...
Trimaran: The Cost of Speed. For all their advantages in terms of performance, the hardware required for the central hull subtracts substantially from the accommodations that are available for a cat of the same size. New trimarans, like the Neel 51 which made waves back in 2017, are pushing back against this perceived comfort gap, the large ...
The F-22 is one of the smaller trimarans in the market. Developed in New Zealand, the F-22 is a folding trimaran built for speed. The hulls are made from narrow fiberglass tied together using fiberglass beams and aluminum, minimizing bulk while optimizing speed. The F-22 is roomy and is not as pricey as other models in the market.
Billed as the World's Ultimate Ocean Cruising Trimaran, the Rapido 60 really is the Queen of the Oceans. It offers speed, safety, performance - and luxury. The inspiration behind the Rapido 60 comes from Paul Koch (co founder of Rapido Trimarans), arguably, the man who has built more production trimarans than anyone else on the planet.
Trimarans tend to be more performance oriented than catamarans. In part, this is because it's easier to design a folding trimaran, and as a result Farrier, Corsair, and Dragonfly trimarans had a disproportionate share of the market. ... Speed-limiting drogues are often used by delivery skippers simply to ease the motion and take some work off ...
Max speed Neel 43. The maximum speed of the Neel 43 trimaran depends on various factors such as wind conditions, sea state, sail configuration, and the weight of the vessel, crew, and equipment. However, the manufacturer states that the Neel 43 has a maximum speed of around 20 knots (23 mph or 37 km/h) under ideal conditions.
With over 1,300 gallons of fuel, the LEEN 56 can cross the Atlantic, so it can basically travel from France to Boston at nine knots. Drop that down a knot and the range extends to a mind-blowing 4,000 nautical miles. In electric mode only with generator assist - you might eek out nearly 4,200 miles albeit at a very slow speed.
Farrier, who passed away in 2017, created the F-22 as a kind of culmination of all he'd continued to learn about small, trailerable multihulls in the years since he penned the F-27 trimaran, a true trail-blazer and now part of the "Sailboat Hall of Fame.". Another F-22 sidles up alongside a pier in Malta with amas folded in.
With its racy, modern silhouette, elaborately designed hull and sleek lines, the NEEL 52 exudes power, speed, and elegance. Moving inside and on the deck is smooth and safe. The NEEL 65 EVOLUTION, the flagship of the fleet, offers unequalled comfort and navigation in "Sport-Chic" mode. NEEL-TRIMARANS is the worldwide leader designing and ...
MULTIHULL of the YEAR 2022! „MARLIN 33" By MARLIN TRIMARANS. JUERGEN TERIETE. light speed marine is run by Juergen Teriete, sailing enthusiast and "everything-sailor" from childhood with 40 years sailing experience and enthusiasm. Starting with regatta sailing on the 420, through numerous racing dinghies and F18 catamarans to countless holiday trips on cruising yachts and catamarans of ...
*SLR = speed (in knots) divided by the square root of Waterline Length (ft). So, below the speed given for SLR=1 and above the speed given for SLR=3.0, the majority of resistance would be directly affected by the roughly 20% increase in the wetted surface for the Vee (or 15% for the Box shape) and if we add in the 5% weight penalty, this could go to about 24%.
The NEEL 47 seduces by its exceptional sailing qualities, it allows to taste the sensations of speed while keeping a feeling of comfort and balance. More pictures. More pictures. NEEL 47 interior. The layout of the boat is designed to optimise user-friendliness on board. The layout of the floats, each with its own independant access ensures ...
Mr Lynch had brought together family, friends and colleagues for an idyllic holiday on his luxury boat: a sumptuous 56-metre (184ft) sailing yacht that won design awards and had the world's ...
Authorities in Italy have opened a manslaughter investigation into the sinking of superyacht, the Bayesian, which killed seven people off the coast of Sicily earlier this week.
More than 180 feet long, with a mast towering about 240 feet and a keel that could be lowered for greater stability, the Bayesian luxury yacht did not, in the eyes of its maker, have the ...