"Wayne.B" wrote in message
...
On 10 Apr 2004 13:45:52 GMT, (JAXAshby) wrote:
It is, of course, though many ignorant people will claim they read it in
a
book, so it HAS to be true.
====================================
There are hull forms that are not bound by their own wave train, or
are bound to a lesser extent (such as long skinny hulls).
There are two primary sources of drag on a boat: Friction ( a function
of surface area and smoothness), and induced drag imparted from
converting motion into wave trains. At low speeds friction dominates
as the primary drag factor, and as speed increases wave making becomes
the dominant factor in a non-planing hull. For an average
displacement hull the tradional equation works fairly well at
identifying the approximate crossover point, where considerable extra
power is required to go any faster.
Thanks Wayne.
Mark Browne