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This boat was 2nd in 4.7 North Americans and 3rd at National 4.7’s in 2023. It is ready to race. It has a few stress cracks but is solid and we haven’t had any issues.
Originally known as the Laser, the ILCA dinghy is a single-handed racing dinghy. The biggest attraction of the ILCA dinghy is that it is protected by strict one-design class rules, which means that no changes are allowed to the boat unless they are specifically permitted in the rules. The result is that all ILCA boats are virtually identical, whether they are brand-new or 10 years old, making it the sailor that wins the race not the boat. The ILCA dinghy is a challenging boat that rewards athleticism, subtle steering, and trimming techniques, as well as tactical excellence. It is a single-handed Olympic-class boat for both men and women and is sailed at club, national, and international levels. With over 225,000 boats in 140 countries, it is the worlds most popular adult and youth racing sailboat.
One of the reasons the ILCA dinghy is so popular is the boats sheer simplicity. The two-part free-standing mast and sleeved sail make the boat easy to rig, and its lightweight hull makes it easy to carry and cartop.
A boat for life.
The ILCA formula combines one hull with three different rigs: ILCA 4, ILCA 6, and ILCA 7. Young sailors starting out in the ILCA 4 can move up in rig sizes as they grow physically and develop tactically without the need to buy a complete new boat every few years. The one-design protection also means that your boat will never be outdated, which explains why ILCA dinghies have such high resale values.
Finally, a strong class association that actively promotes and drives forward sailing around the globe makes mass production of the ILCA dinghy viable, keeping the cost of the boats and spares relatively low.
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)
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