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  Prop Help 1988 15'CC with 1988 Mercury 70 ELPTO

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Author Topic:   Prop Help 1988 15'CC with 1988 Mercury 70 ELPTO
Lil Whaler Lover posted 08-09-2004 09:56 PM ET (US)   Profile for Lil Whaler Lover   Send Email to Lil Whaler Lover  
I finally got the tach put on the 15" Center Console and got some performance numbers. The prop is a Mercury Laser II 13.5 X 22" pitch. The motor has a gear ratio of 2.3 and shoud run between 4,750 and 5,250 rpm. All speeds are Garmin GPS. The boat was lightly loaded, 175 pound driver, 6 gallons of gas and minimal gear. The engine is mounted in the second hole. It takes 3.5 seconds to come on to a full plane.
It is on plane at 2500 rpm and 19.5 mph. The top speed is 43.2 mph at 4800 rpm. While this calculates to almost 100% efficiency the boat is chine walking like crazy and is a real handful, only controllable due to the power trim.

Any suggestions would be appreciated.

Peter posted 08-10-2004 06:23 AM ET (US)     Profile for Peter  Send Email to Peter     
Drop down to a 20 inch pitch. Your pitch is too high. Chine walking begins to happens at speeds over approximately 38 MPH. There is nothing you can do about it other than be careful.
Clark Roberts posted 08-10-2004 07:55 AM ET (US)     Profile for Clark Roberts  Send Email to Clark Roberts     
I second Peter's advice! Clark... Spruce Creek Navy

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