Catamaran Hull Width. While the lengthbeam ratio of catamaran LBRC is between 22 and 32 a catamaran can be certified to A category if SF 40 000 and to B category if SF 15 000. In the case of a catamaran which has no keel to weigh the boat down slimmer and more hydro dynamically optimized hulls this theoretical hull speed rarely applies.
Catamaran Sailboat Wide Bodied Hulls. That gives you a k factor of 33 - the k factor replaces the usual 135 that you multiply times the square root of the waterline length to get the hull speed. From the schematics at the top of page 117 one can easily see how the wetted surface of each type of hull section differs yet.
While the lengthbeam ratio of catamaran L BRC is between 22 and 32 a catamaran can be certified to A category if SF 40 000 and to B category if SF 15 000.
A word of caution. Typically cruising catamarans will have a beam to length ratio of roughly 50 meaning a 45 long cat will be about 22 wide. The engine power needed for the catamaran is typically 4 kWtonne and the motoring speed is near the hull speed. For this study the length of asymmetrical catamarans and regular catamaran was changed to 40m it was made sure that parameters such as displacement and draft amid ship were kept constant for fair comparison.
