11 Sep 95, Dan Ceppa writes to Ed Debee:
 DC> @TID: WILDMAIL!/WC v4.12  92-0416
 ->> On 09-09-95  10:18, Ed Debee got back to All
 ED>> of 1.34 times square root of waterline length is only an average.  For
 ED>> instance, my Precision is a semi-flat bottomed hull with shoal draft
 ED>> keel.  Computed hull speed is 5.95 knots.  However, if the heel is
 ED>> kept at 15 deg. and the wind is on some part of the beam, I can
 ED>> usually hold 6.2 knots.  This is due to the hull starting to rise up
 ED>> in the water,
 DC> Ed, that's part of it.  However, the effective water line length
 DC> is raised as well because of the heeling.  There have been a
 DC> few "rules breakers" build with very long overhangs both
 DC> forward and astern that used that technique.
I know what you mean.  In this years Turnback Canyon Regatta, (TCR is a 2 day 
long distance regatta.  First day is 17 miles up river, and return on 2nd 
day, after big overnight party) we were in contention with a boat that had a 
higher PHRF handicap but had a longer LWL when heeled.  So under meduim 
winds, he would eat our lunch.  Under light or heavy winds, he would fall 
behind. Because of the mix of winds on both days, he took 1st and we 2nd.  He 
chuckled about the RC not catching the long overhanging bow and stern 
changing the handicap when heeled.  A big lesson for me, but a good battle, 
none of the other boats were near us in line postion or corrected time.
 ED>> reducing the wetted surface drag. Downwind, with gusts and surfing, we
 ED>> have seen 9.2 knots.  But this skipper doesn't like the feel of the
 ED>> helm.  Tricky.
 DC> The surfing aspect is not taken into consideration at that point.
 DC> That ability is partially a function of displacement.  For our
 DC> last weekend regatta, the A fleet was broken into 2 divisions:
 DC> Heavy and Light.  It was a great move, as the air was light and
 DC> the smaller light displacement boats would have eaten the
 DC> heavier big boys alive.  It turned out that each division was
 DC> close in itself, adding to the enjoyment of the event.
I wish they would break us out like that.  We do surf well, but those 
conditions on our narrow lake/river are rare.  It is a hoot when the knot 
meter jumps up above 7 knots however.
Another good example of the 1.34 rule violation are the hulls of catamarans. 
While they don't plane, the narrowness allows them to overcome the standard 
displacement rule.
Fair Sailing,
Ed
--- GoldED 2.40
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