[Rhodes22-list] Rob - don't forget the prop

[Michael Meltzer]

that is only a iaasue for powerboats and "get out of the hole", the issues for sailboats is prop size and grear reduction, we want a
large slow turning prop, the problem for us is more of the marine engines are made for hight speeed powerboats, which use smaller
faster turning props.

MJM
----- Original Message ----- 
From: "Robert Dilk" <Robert.Dilk at TRW.COM>
To: <pthorn at nc.rr.com>; <rhodes22-list at rhodes22.org>
Sent: Saturday, February 14, 2004 1:47 PM
Subject: Re: [Rhodes22-list] Rob - don't forget the prop


I thought 4 cycle had better low end??
2 cycle made more HP per pound, but due to the reeds (vs valves), had a smaller power band in the higher rpm range??


Bob
S/V Knot Necessary

>>> pthorn at nc.rr.com 02/13/04 05:31PM >>>
Rob,

While you're evaluating outboard motors, don't forget to consider the propeller.  A sailboat needs good low speed torque ( 2 cycle
is better for this, although 2 cycle does seem to be on the way out) and a low pitch prop - around 6" per revolution or so.  This
will enable you to get a good "bite" at low rpm and move along nicely at speeds less than full throttle.  Also will help going
against waves/wind.  High end speed is not really a factor in pushing a sailboat because of hull speed limits.

If you get a good deal on a motor, but find out later you need to buy a new prop - might not be such a good deal.

Fair winds,

PT

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