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Built between 1975 and 1979 with roughly 750 built, the HOBIE 3.5 is based on the HOBIE 14 but designed for kids weighing less than 140 lbs. The hulls appear to be the same as the HOBIE 14, with other parts shared with the MONOCAT 12, including rudders, mast and mast step. The boat had wooden rudders with a different rudder casting locking system. It was also considerably narrower which, in theory, allowed easier righting after a capsize. They are so narrow that you can actually tuck one in under a 16 on a trailer.This particular boat spent all of its life along the Gulf Coast of FL. The mast, rudders, tramp and rigging are in good shape but the hulls are totally delaminated and unusable as they sit. This would be a great boat for parts or a project if you are really, really good at fiberglass work. Picts available upon request.
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)
The HOBIE 3.5 is based on the HOBIE 14 but designed for kids weighing less than 140 lbs. The hulls appear to be the same as the HOBIE 14, with other parts shared with the MONOCAT 12, including rudders, mast and mast step. The boat had wooden rudders with a different rudder casting locking system. It was also considerably narrower which, in theory, allowed easier righting after a capsize.
This listing is presented by TheBeachCats.com. Visit their website for more information or to contact the seller.
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