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Let's say a powercat has 12:1 L:B ratio, and with a certain weight and prismatic and design and engines...and... it makes for a certain fuel efficiency at 12-15knots (which is higher than "hull speed" (1.34x)). Would a higher L:B improve the fuel efficiency (almost certainly yes?), and by how...

I've read before about how a powercat has a very different hull shape to a sailing cat (ignoring tris). I can understand that truth if you are planning on flying around at 20+ knots (on either design!). However, say you were designing for cruising (not gulping fuel); why *must* the powercat...