[Public-List] Prop Question

[RogerW]

Hey Richard, I've just last week finished installing a Yanmar 3YM20 (22 
HP @ 3600 rpm) with 2.62 (Forward) transmission for John Scott, #26 
Wooshkeetaan. We ended up with a three blade 13 X 12 prop as suggested 
by Kastel's Prop Shop, and seemed in line with the PropCalc computer 
program. (Barney Kastel would have liked it if we had the 1:2.2 ratio 
gear. We could have used less pitch) This left about 0.75 inch (I think) 
between  blade and hull at upper side of aperature. I've only idled her 
around the slip area and moved her to a mooring. He ran her for about 
2.5 hrs last Thursday, says all was well. Soon I will try her at various 
speeds and check for cavitation and vibration. I'll let you know. RogerW

richard.hazlegrove at wachovia.com wrote:
> Yesterday I asked if anybody could give me some advice for a friend 
> regarding prop size on his new Yanmar 3 YM20 which I believe is pretty 
> close to the prior model 3GM.  I mistakenly indicated a 2.0x transmission 
> reduction gear.  It is in fact a 2.21x reduction.  I also neglected to 
> mention that he is looking for advice regarding a three blade prop.  The 
> engine by the way is rated at 22 hp at 3,600 rpm.  Thanks
>
> Richard Hazlegrove
> Quest 433
> Mobjack Bay, VA. 
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