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I entirely agree with you. For the purposes of my question, if I were interested in other aspects I would have mentioned them :)

Thanks David - that's the response I thought but you have written well: there's no simple, universal curve. Damn :rolleyes:...

Ad Hoc is of course right - have to scale the displacement and WSA for greater/lesser LB ratio. And thank you for associating directly that my factor of fuel consumption (my measure) is more accurately discussed by talking resistance. I was wondering (perhaps not loud enough ;)) whether...

Sorry about that - I hadn’t been pinged for any new reply so hadn’t returned! The boat length is irrelevant unless you can support that there is something in the relationship that breaks down at a certain length (high or low). Otherwise why would we have ready reckoning formulae that have no...

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...

How about twin stub masts, say 20', half way down each side of the boat that run a square headsail (astern or at 45 degrees astern) or twin triangular "jibs" side-by-side up from 45 astern to near abeam? May be easier than a kite. BTW, were their "real figures" better or worse than implied?

Hi Rylo, we’re the owners of bluenomads and the cat, Blu Emu. One of the factors of a mono is definitely felt at anchor. Even Dashew has active roll control on their power monos for a reason, and they are purposely (like you) narrow and long. Wider monos would roll less, but there’s few that...

The only CC24 I've seen pictures of was more of a motor-sailer than sailing machine. Have a look in the pictures in the Yahoo! Groups area on the jarcat mailing list (that I look after :cool:). The CC29 was a good sailer that I was on a few times in Morton Bay and did a trip with Ross Turner...

Thanks for that - I'd read it years ago but forgot. I think Malcolm has answered me: (my emphasis) and he also explains a little why boat length (size) makes a difference. I was thinking of around 28-35' boat size originally, but I didn't think it mattered for the principle (I was wrong)...

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...