Displacement or plane hull? - Page 4 - SailNet Community
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post #31 of 35 Old 02-09-2009
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fast or slower?

As an example , take a look at these two similar displacement boats:
Santa Cruz 40 - from the stable started by Bill Lee who coined the phrase "Fast Is Fun"
40' loa
36' lwl
12' beam
7' draft
10,500 disp
5,000 ballast
760 sq ft sail area

and contrast this with:
Cape Dory 30
30'2" loa
22'10" lwl
10,000 disp
4,000 ballast
4'2" draft

Last edited by mitiempo; 05-29-2009 at 02:51 AM.
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post #32 of 35 Old 02-09-2009
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continued...

As you can see, the Santa Cruz 40 has every spare ounce pared from her construction - this requires very good engineering - no extra weight anywhere - the bulkheads are 3/8" ply without edge trim. It's the price you pay for travelling faster. The Cape Dory 30 (sorry no picture, but easy to find)
is much more traditional and an extra pound here or there is much less of an issue. Space is larger below on the Santa Cruz, you just can't fill it up and have the same performance. As boats get larger, it's easier to have speed and more amenities.
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post #33 of 35 Old 02-10-2009
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A couple things that may be a little misleading in the Santa Cruz vs Cape Dory discussion is that the Santa Cruz is a much earlier generation semi-displacement design, and the newer semi-displacement designs are much more tollerant of weight and are constructed with more modern interior components that look a lot more finished than the 'scan' interiors of the 1970's. It is also my sense is that the Santa Cruz would actually tollerate more payload weight than the Cape Dory as a percentage of their displacement. What is often forgotten is that a boat like the SC40 would be raced with a crew of 8 or 10 in the Transpac race and that this represents as much as 3,000- 4000 lb of crew, gear, and consumables. I have a tough time thinking of a Cape Dory 30 carrying anything like that.

Jeff


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post #34 of 35 Old 02-10-2009
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Jeff...while you know I will always be of the BIG and HEAVY and Heavily built persuasion for cruising...thanks for an excellent few posts. Most interesting to read and understand.

No longer posting. Reach me by PM!

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post #35 of 35 Old 02-11-2009
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George,

Thanks for your kind words.

Jeff


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