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  15-footer, 40 to 50-HP

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Author Topic:   15-footer, 40 to 50-HP
Binkster posted 09-12-2014 12:07 PM ET (US)   Profile for Binkster   Send Email to Binkster  
On my 15-foot Whaler, what would you expect the performance difference to be running a 50-HP two-cycle outboard over a 40-HP four-cycle?


goldstem posted 09-12-2014 12:17 PM ET (US)     Profile for goldstem  Send Email to goldstem     
About 3- to 4-MPH, or 34 to 30.

Peter posted 09-12-2014 04:00 PM ET (US)     Profile for Peter  Send Email to Peter     
My 1987 15 SuperSport ran to a top speed of 36 MPH consistently with one person and one 6 gallon full gas tank with a 1988 Johnson 48 SPL mounted all the way down turning a 17 inch pitch aluminum OMC propeller. Same boat ran to a top speed of 42 MPH consistently under same setup with a 2003 Yamaha 70 turning 19 inch pitch aluminum Yamaha propeller.
jimh posted 09-12-2014 08:45 PM ET (US)     Profile for jimh  Send Email to jimh     
My 1976 SPORT 15 with 1976 Mercury 500 (50-HP powerhead rated) ran about 33 to 34-MPH top speed.

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