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- Sailboat Guide
Cooper 416 is a 41 ′ 6 ″ / 12.7 m monohull sailboat designed by Stan Huntingford and built by Cooper Enterprises Inc. starting in 1978.
Rig and Sails
Auxilary power, accomodations, calculations.
The theoretical maximum speed that a displacement hull can move efficiently through the water is determined by it's waterline length and displacement. It may be unable to reach this speed if the boat is underpowered or heavily loaded, though it may exceed this speed given enough power. Read more.
Classic hull speed formula:
Hull Speed = 1.34 x √LWL
Max Speed/Length ratio = 8.26 ÷ Displacement/Length ratio .311 Hull Speed = Max Speed/Length ratio x √LWL
Sail Area / Displacement Ratio
A measure of the power of the sails relative to the weight of the boat. The higher the number, the higher the performance, but the harder the boat will be to handle. This ratio is a "non-dimensional" value that facilitates comparisons between boats of different types and sizes. Read more.
SA/D = SA ÷ (D ÷ 64) 2/3
- SA : Sail area in square feet, derived by adding the mainsail area to 100% of the foretriangle area (the lateral area above the deck between the mast and the forestay).
- D : Displacement in pounds.
Ballast / Displacement Ratio
A measure of the stability of a boat's hull that suggests how well a monohull will stand up to its sails. The ballast displacement ratio indicates how much of the weight of a boat is placed for maximum stability against capsizing and is an indicator of stiffness and resistance to capsize.
Ballast / Displacement * 100
Displacement / Length Ratio
A measure of the weight of the boat relative to it's length at the waterline. The higher a boat’s D/L ratio, the more easily it will carry a load and the more comfortable its motion will be. The lower a boat's ratio is, the less power it takes to drive the boat to its nominal hull speed or beyond. Read more.
D/L = (D ÷ 2240) ÷ (0.01 x LWL)³
- D: Displacement of the boat in pounds.
- LWL: Waterline length in feet
Comfort Ratio
This ratio assess how quickly and abruptly a boat’s hull reacts to waves in a significant seaway, these being the elements of a boat’s motion most likely to cause seasickness. Read more.
Comfort ratio = D ÷ (.65 x (.7 LWL + .3 LOA) x Beam 1.33 )
- D: Displacement of the boat in pounds
- LOA: Length overall in feet
- Beam: Width of boat at the widest point in feet
Capsize Screening Formula
This formula attempts to indicate whether a given boat might be too wide and light to readily right itself after being overturned in extreme conditions. Read more.
CSV = Beam ÷ ³√(D / 64)
Molds were later acquired by Bayliner/US Yachts where it became the US 42.
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Review of cooper 416
Basic specs..
The hull is made of fibreglass. Generally, a hull made of fibreglass requires only a minimum of maintenance during the sailing season.
The boat equipped with a masthead rig. The advantage of a masthead rig is its simplicity and the fact that a given sail area - compared with a fractional rig - can be carried lower and thus with less heeling moment.
The cooper 416 is equipped with a fin keel. A boat with a fin keel is more manoeuvrable but has less directional stability than a similar boat with a full keel.
The keel is made of lead. Compared with iron, lead has the advantage of being 44% heavier, which allows a smaller keel and hence less water resistance and higher speed.
The boat can only enter major marinas as the draft is about 2.01 - 2.11 meter (6.59 - 6.89 ft) dependent on the load. See immersion rate below.
The boat is typically equipped with an inboard Perkins 4.108 FWC diesel engine at 48 hp (35 kW). Calculated max speed is about 6.0 knots
Sailing characteristics
This section covers widely used rules of thumb to describe the sailing characteristics. Please note that even though the calculations are correct, the interpretation of the results might not be valid for extreme boats.
What is Capsize Screening Formula (CSF)?
The capsize screening value for cooper 416 is 1.94, indicating that this boat could - if evaluated by this formula alone - be accepted to participate in ocean races.
What is Theoretical Maximum Hull Speed?
The theoretical maximal speed of a displacement boat of this length is 7.6 knots. The term "Theoretical Maximum Hull Speed" is widely used even though a boat can sail faster. The term shall be interpreted as above the theoretical speed a great additional power is necessary for a small gain in speed.
The immersion rate is defined as the weight required to sink the boat a certain level. The immersion rate for cooper 416 is about 283 kg/cm, alternatively 1587 lbs/inch. Meaning: if you load 283 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 1587 lbs cargo on the boat it will sink 1 inch.
Sailing statistics
This section is statistical comparison with similar boats of the same category. The basis of the following statistical computations is our unique database with more than 26,000 different boat types and 350,000 data points.
What is Motion Comfort Ratio (MCR)?
What is L/B (Length Beam Ratio)?
What is a Ballast Ratio?
What is Displacement Length Ratio?
What is SA/D (Sail Area Displacement ratio)?
Maintenance
When buying anti-fouling bottom paint, it's nice to know how much to buy. The surface of the wet bottom is about 47m 2 (505 ft 2 ). Based on this, your favourite maritime shop can tell you the quantity you need.
Are your sails worn out? You might find your next sail here: Sails for Sale
If you need to renew parts of your running rig and is not quite sure of the dimensions, you may find the estimates computed below useful.
| Usage | Length | Diameter | ||
| Mainsail halyard | 35.6 m | (116.8 feet) | 12 mm | (1/2 inch) |
| Jib/genoa halyard | 35.6 m | (116.8 feet) | 12 mm | (1/2 inch) |
| Spinnaker halyard | 35.6 m | (116.8 feet) | 12 mm | (1/2 inch) |
| Jib sheet | 12.7 m | (41.5 feet) | 14 mm | (0.55 inch) |
| Genoa sheet | 12.7 m | (41.5 feet) | 14 mm | (0.55 inch) |
| Mainsheet | 31.6 m | (103.8 feet) | 14 mm | (0.55 inch) |
| Spinnaker sheet | 27.8 m | (91.3 feet) | 14 mm | (0.55 inch) |
| Cunningham | 3.7 m | (12.0 feet) | 12 mm | (1/2 inch) |
| Kickingstrap | 7.3 m | (24.0 feet) | 12 mm | (1/2 inch) |
| Clew-outhaul | 7.3 m | (24.0 feet) | 12 mm | (1/2 inch) |
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Designed to determine if a boat has blue water capability. The CSF compares beam with displacement since excess beam contributes to capsize and heavy displacement reduces capsize vulnerability. The boat is better suited for ocean passages (vs coastal cruising) if the result of the calculation is 2.0 or less. The lower the better.
The Cooper 416 is a Canadian sailboat that was designed by Stan Huntingford as a cruiser and first built in 1978. The design was developed into the US Yachts US 42 in 1982 when the moulds were sold to Bayliner.
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Cooper 416 is a 41′ 6″ / 12.7 m monohull sailboat designed by Stan Huntingford and built by Cooper Enterprises Inc. starting in 1978.
Cooper boats for sale on YachtWorld are available for a swath of prices from $25,000 on the relatively lower-priced models, with costs up to $999,000 for the most luxurious yachts. What Cooper model is the best? Some of the most widely-known Cooper models currently listed include: Prowler, 416, 416 Pilothouse, 60 and 800. Specialized yacht ...
The cooper 416 aka Us 42 is a large sailboat designed by the maritime architect Stan Huntingford in the late seventies. The cooper 416 is built by the Canadian yard Cooper Yachts Ltd..
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