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Author Topic:   15-footer 70 Johnson
FrankHgh posted 08-11-2014 10:06 PM ET (US)   Profile for FrankHgh   Send Email to FrankHgh  
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)     Profile for dg22  Send Email to dg22     
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)     Profile for dgoodhue  Send Email to dgoodhue     
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)     Profile for jimh  Send Email to jimh     
If you already have both propellers, just put them on the propeller shaft and go for a test run.

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