SailNet Community - View Single Post - Displacement or plane hull?
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post #6 of Old 12-30-2008 Thread Starter
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The displacement is just a first-order swag based on some similar light-weight designs. The original sketches where around 19000 displacement when I stumbled across an article about the Didi 38 which apparently uses something close to a semi-displacement hull. It supposedly achieved some pretty decent speed. Personally, I am really not all that interested in getting beat up by my boat or have to continually chase the helm, so I'll probably go back to a regular round bottom. I just wanted to explore all my options.

I would love to find some good books on practical design. But the local book stores don't stock any boating books beyond some picture albums. I found several interesting books on Amazon which I'll order in the near future.

I'm not worried about the software. Hydrostatics is rather straight-forward. I verified it using known hull shapes to check to see that the results matched. I'll continue to crosscheck it along the way. Hydrodynamics on the other hand is a little tougher.

Yes, I know I'm a newb to this at this stage, but I don't go into something like this without a lot of research before becoming committed. It's all on paper at this stage. FYI: You want pucker factor? Try test flying something you built.

Question: Is beam normally measured at the waterline? 99% of the definitions I've read state that beam is measured at the widest part of the boat's structure. The waterline beam measure makes much more engineering sense. Which is correct?
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