|
Theoretical hull speed is rarely
exactly calculated, as there are factors in play besides just
length of waterline. Length of water line is just the most
prominent factor. Beam relative to length, wetted surface, etc,
all play minor roles. That said, hull speed is really just a
"sweet spot" where the effiency of a displacement hull has reached
it's maximum potential. To get any additional speed, you need a
LOT more power. Dubling you power applied will not give you very
much additional speed. I can get my boat to it's hull speed under
power at about 1/4 throttle. To go noticeably (a little) faster, I
have to go almost to full throttle. That is in flat water with
relatively no current. The place where a bigger engine, or more
throttle, makes a difference in a displacement hull is the better
acceleration (up to hull speed) that gives you quicker recovery
after being hit by waves head-on. Also be aware that hull speed
is speed through the water, not speed over ground. The direction
of the current counts! Your GPS may say you are doing 8 knots, but
2 of that may be the outgoing tide that is adding to your speed
over ground, but not your speed through the water. I'm using
motoring in my examples because it is a little simpler to explain
and understand without all the added information as to point of
sail, windspeed, sails being flown, etc.
Bill Bina On 5/19/2013 7:41 PM, sam.c.sal...@gmail.com wrote:
|
_______________________________________________ This List is provided by the C&C Photo Album http://www.cncphotoalbum.com CnC-List@cnc-list.com
