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Author	Topic:   15-footer 70 Johnson
FrankHgh	posted 08-11-2014 10:06 PM ET (US)         Between a 13-1/4 x 21 stainless steel propeller and a 13-1/4 x 17 aluminum propeller, which is the better propeller for a Boston Whaler 15-foot boat with a Johnson 70 outboard engine?
dg22	posted 08-13-2014 10:13 AM ET (US)             The lower pitch one (13 1/4 X 17) would be better for when you have the boat fully loaded or when pulling skiers, etc.. and the higher pitch one would be better for lighter loads. So your low pitch prop would be your work prop and the high pitch would be your speed prop.
dgoodhue	posted 08-14-2014 10:54 AM ET (US)             What kind of propellers are they? The aluminum propeller will over-rev the motor at full throttle but would be useful for watersports. A 13-1/4 x 17 Stiletto stainless steel or a 13 x 19 OMC SST propeller would be good propellers for your boat with the [70 Johnson] engine on the transom, assuming the motor is not mounted too low.
jimh	posted 08-18-2014 12:17 PM ET (US)             If you already have both propellers, just put them on the propeller shaft and go for a test run.

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