A boat with a higher value will accelerate faster and get to hull speed with less wind.

Catamaran design ratios. Finer hulls are more efficient at high speeds but as weve just seen suffer from more WSA and so for normal cruising catamarans in average conditions a ratio of 111 - 131 seems optimum. This design also included a modern mast for better performance. B CB L H L BRC B CB 555.

So a multihull should be at least 061 and a heavy displacement multihull a bit higher still. And anything above 18 to 20 suggests relatively high performance provided the boat has sufficient stability and a low enough displacement-length ratio to take advantage of its abundant sail area. Heavy and doesnt let the water throughcan trip in large ocean wave surfing situations Accommodations spread into the ends.

The Design Ratios Sponberg Yacht Design Inc. Some skimming dish racing sailboats also have LB in this range. It is difficult to get much over 067 without a very distorted hull shape or one with excessive WSA.

A Catamarans Power to Weight Ratio or Sail Area Displacement Ratio SAD SA Disp 64 23 This ratio is an indicator of how much sail area a catamaran has relative to its displacement. LBRC LH BCB. L BRC L H B CB.

It has a DL ratio of 94 yet features a large and modern interior. Wider construction makes her heavier narrower makes her carry less sail. However the key to Catamaran design is you need a higher Cp if you want to sail fast.

The Lock Crowther-designed Catana 44 first built in 1992 was one of the earliest fast French production boats to hit the market. Low Aspect Ratio LAR Keel Design. If we set LBRC 22 the longitudinal and transversal stability will come very near to the same value.