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Hobie 21 Special Edition is the biggest beachcat that the company every built. At 21 feet long and 10 feet wide before you count the wing seats, it can handle a good amount of people on it and still sail well. The wing seats make a great place to sit that are both comfortable and great for getting weight out over the side. Comes with main and roller furling job. Both in good shape. Trampolines are all in good shape as well. I have added a Spinnaker pole with a roller furling gennaker on it for going deeper down wind. Comes on a trailer setup with a powered winch to raise and lower the mast easily with an A frame gin pole as support. Comes with beach wheels the right width for this width of catamaran. A aluminum box on the trailer for holding gear and the winch and battery for the mast raising and lowering. Also includes a Cheata motor mount that has not been installed.
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)
Developed as a one-design for a professional racing circuit that came to fruition for a very short period in the late 1980’s.
Beam: retractable to 8’. 14’ with wings.
For a time, with built in storage, and a cooler, it was reissued as the HOBIE 21 SPORT CRUISER.
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