On 4/2/10 6:30 PM, hk wrote:
On 4/2/10 6:13 PM, Wayne.B wrote:
On Fri, 2 Apr 2010 14:28:48 -0700 (PDT), Frogwatch
wrote:

Something I noticed on this leg of my cruise is the radical diff tween
the wakes of mono and catamaran hulls for power boats. The monos have
huge wakes while the cats have very small wakes. This should give
better fuel economy. Does it?

It absolutely does. The less water you push aside the better from
the standpoint of efficiency. One of the big cruising trends we are
seeing this year is the increase in multi-hull sailboats. There are
hundreds of them just here in Martinique and it looks like they will
be in the majority sooner or later.

Sorta depends upon the boats, their designs, their weights, and how they
are used. For example, a 32' WorldCat, with two F250 Yamahas, weighs
about 8000 pounds and at 4000 rpm produces 26.4 mph and burns 26.4 gph.
A Scout with the same engines that weighs nearly a ton more burns about
the same gph and produces a few more mph for the same fuel burn.

Of course, the question was about mono and cat hulls for power boats,
not "multi-hull sailboats," eh?





Err, make that about 16.1 gph for the fuel burn on both boats...

--
http://tinyurl.com/ykxp2ym