"Wildest Dream" wrote in message
et...
technically your both right in some aspect the trim tabs that are
adjustable
are retracted once on plane creating less drag, there still is some due to
the added wetting surface but it is minimal, but some boats need tabs to
get
up, w/out them it would not plane and it would than be a semi-displacement
boat and be very inefficient at high rpm's. it matters the application.


Of course they will not be efficient on every boat, nor at every speed, but
my contention is that they *can* reduce drag when used correctly on a
planing hull. Basskisser's contention is that they *can't* reduce drag since
they create some drag themselves. I have been very careful to always state
that to increase efficiency the tabs be used "properly" or "correctly" and
have provided real world scenario's, but he still argues that they can not
increase efficiency due to their drag. He is dead wrong.

All *planning hulls* will see *some* improvement in efficiency at various
speeds. This improvement will mostly be realized in slow to midrange speeds.