In article ,
says...

wrote in message
...
On Fri, 16 Apr 2010 21:01:09 -0700, "nom=de=plume"
wrote:

.. wouldn't a newer boat in the
size I mentioned from a reputable US manufacturer be powered properly?

This is what Froggy is saying "properly" depends on which side of the
compromise you want to come down on. You can have a fast power boat
with sails or a fast sailboat with a motor but both at the same time
is hard to do.


My understanding is that the engine on a cruising type boat would be able to
bring the boat to "hull" speed. You can't really go faster than that, so I
suppose the appropriate engine would be one that could do that (or nearly
so)? 1.34 x sq. rt of water line? So, assuming there's overhang on a 42'
boat, say the water line is 40' the max speed would be about 8.5. Of course,
if it were not pushing all the water, skimming, then you could go faster.

They call "skimming" "planing" here.
And you are correct. But many hull types are incapable of planing.

Peter