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JBoat

04-29-2008 11:53 AM

Prop Help

Guys trying to help a frend with a smaller boat, he has a 21 footer and is looking to upgrade his prop.

He currently has a 13.5 x 23 pitch prop and wants to go to a 14.5 or 15 diameter but needs to know where that would be as an equivelent pitch.

His hope is the bigger diameter will help on the bottom end with out loosing top speed. Its a 3400 lb boat with a merc 5.7 ( 210 HP) and Alpha 1 drive. He it running aboiut 52-53 MPH at 5500 RPM now.

BY U BOY

04-29-2008 11:59 AM

21P is what most 5.7L 21' boats run.

JBoat

04-29-2008 01:13 PM

21P by what diameter ? If you know off hand.

throttleup

04-29-2008 05:33 PM

I would say max of 14.25" on a 21 ft. boat.

Julie

Griff

04-29-2008 07:34 PM

I don't think he can run that much diameter on an Alpha drive.

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