Join Date: Nov 2007
Location: East Providence, R.I.
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Originally Posted by ekenna
The boat docs mention these props with these engines
atomic 4: 14 X 6 RH
volvo 7a: 14 X 9 LH
yanmar YS 12: 14 X 10 RH
yanmar QM 15: 14 X 14 RH
(Question is the 14 in "14 X 6" 14 inches? if so maybe I just have the wrong prosize because the prior owner say it was a 12 inch prop)
Alignment wouldn't slow you down unless the shaft is rubbing so hard on the tube or cutlass that it would actually grind through it.
Props are easy to understand (sometimes)
1st number is the diameter in inches.
2nd number is how far the prop "should" drive the boat under ideal conditions in inches w/ 1 revolution of the shaft. (i.e. only in clay would this actually work)
a 14 x 6 would theoretically be 2/3's as fast as a 14" x 9" at the same RPM's on the same boat.
Too big of a prop, like 14 x 16", would just bog the engine right down.
Ken, East Prov., R.I. Bootlegger, PY26 Paceship
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Last edited by MacGyverRI; 10-28-2010 at 01:40 AM.