Re: Small sailing ship help

On Tue, 20 Nov 2007 11:09:35 -0800, David Friedman wrote:

In article <JrtIMw.Hr8@xxxxxxxxxxx>,
djheydt@xxxxxxxxxxx (Dorothy J Heydt) wrote:

Speed (in knots) = 1.4 * sqrt waterline length.

You don't have to work out the math on this; just keep in mind
that the longer the ship, the faster it'll go, and, conveniently,
the more linear space you have between the bow and the stern,
with room for some of your passengers to be out of earshot of the
others.

Did sailing ships typically move fast enough for this constraint to
become binding?

The square root makes the numbers rather small. The numbers given by the
formula are approximate, of course -- a tubby coaster and a lean fishing
vessel of the same length won't go the same speed. Some:

LOA ft Meters Hull Speed (Knots)
20 6.1 6.3
25 7.6 7.0
30 9.1 7.7
40 12.2 8.9
50 15.2 9.9 (biggest thing I've ever handled)
75 22.9 12.1 (about the max for a single-mast plan)
100 30.5 14.0 (Good-sized ship for Jonathan's era, I think)
280 85.3 23.4 (Cutty Sark, which reportedly achieved 22 kt)

So yes, given the size and speed of a typical sailing ship, hull speed
is extremely important.

Regards,
Ric

--
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