"Larry" wrote in message
...
nom=de=plume wrote:
wrote in message
...
On Apr 17, 8:05 am, "Peter (Yes, that
wrote:

In ,
says...






wrote in message
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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

Displacement hull sailboats cannot plane which is why they need so
little power. Manufacturers generally use an engine just big enough
to get to hull speed. I do not think that is enough for a real
cruising boat because a real cruising boat will spend far more of its
time under power than people realize AND because sometimes it will be
used in conditions when a lot of power is needed for safety. For the
size boat Nom is considering, a 4 cylinder diesel would be good and
they normally have sufficient power. The problems come in with
smaller boats when it is a compromise between a 1 or 2 cylinder or a
slighter larger boat betwen a 2 and 3 cylinder. She prob does not
need to worry about the engine.


Reply: I would never worry about the engine. That's someone else's area.


Yet you are dwelling on it here.


You're a troll. You're not too bright. Did I mention you're stupid?

--
Nom=de=Plume