"CaveLamb" wrote in message
...
Vic Smith wrote:
On Tue, 29 Mar 2011 05:04:01 -0500, Richard Casady
wrote:

On Mon, 28 Mar 2011 22:16:58 -0500, CaveLamb
wrote:

Three inches is 1/4 of a foot.
So..

1.33 * sqrt (.25) = ?
1.33 * .5 = .665 knots difference In theory, at least.
27^.5=5.2 27.25^.5=5.22. Three hundredths of a knot difference.

Casady


Hmmm. HP calculator?

--Vic


Sorry guys
Just late and not paying attention to the numbers.

Half a knot for 3 inches does seem a little funny, doesn't it...



Since the fudge factor is multiplied by the square root of the LWL, the LWL
must be significantly longer than a few inches for the theoretical speed to
go up much. But, every little bit counts. Even a clean bottom makes a huge
difference and many sailors go around with a fouled bottom not realizing how
badly it slows them down. Same goes for those dumb, big, three-bladed fixed
props. What a DRAG!


Wilbur Hubbard