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The J/70 designed by Alan Johnstone and built by C&C Composites in Bristol, RI is a fast 22-foot fractional sloop rig keel boat that is trailerable and boat ramp launchable.
The deck-stepped mast and rigging can be set by two people.
This is the perfect one-design or club race boat. Fast and exciting to sail, yet stable and roomy enough for the whole family in the 11-foot cockpit with a small cabin to change in, get out of the weather, or for storage.
Whether you enjoy light day sailing or planning downwind with the large asymmetrical spinnaker deployed on the retractable bow sprit this boat is all about fun.
This J/70 comes with the class-specified 2.5 Hp Suzuki outboard.
The triad trailer is purpose-built for this boat and has a large storage box. Due to the light weight a large tow vehicle is not required.
The boat/trailer fits through most garage doors!
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
A more accurate formula devised by Dave Gerr in The Propeller Handbook replaces the Speed/Length ratio constant of 1.34 with a calculation based on the Displacement/Length ratio.
Max Speed/Length ratio = 8.26 ÷ Displacement/Length ratio.311
Hull Speed = Max Speed/Length ratio x √LWL
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
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
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
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 Beam1.33)
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)
This listing is presented by PopYachts.com. Visit their website for more information or to contact the seller.
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