Draft Depth Response

[robherc]

Originally Posted by daiquiri

Hi Robherc,
Just one consideration/question - if your cat is not intended for speed, then why did you choose to give it wet transoms? It will add resistance in displacement speed range. Or was it just a necessity to add volume aft and keep the draft as shoal as possible, for a given weight?
Cheers.

Actually, the transoms are wet because it was a 2 hour redesign from a canoe stern that just didn't have the properties I wanted. I'm not completely done fiddling with it yet, and I'm probably going to raise the transoms another few inches. I'll likely end up leaving 1"-2" (2.5-5cm) of the transoms wet for extra aft buoyancy as you guessed, but I think I can trim it down more than I already have.

[robherc]

...I just looked at that linesplan again....it looks like I posted the WRONG PLAN...the posted plan shows an 18" draft, 30' LOA cat (that I designed in 15 minutes, for a diff. thread), my boat will be 9" draft and 22'6" LOA...here is the correct linesplan (with MUCH less wetted surface on the transoms).

[Fanie]

Originally Posted by sigurd

I found it in his folder at proa_file yahoo group.
There are other spreadsheets there to look at as well.

Thanks Sigurd, I'll have a play with the spreadsheet.