Boat Maintenance: Buying a new prop

Boat Maintenance: Buying a new prop - Need Help

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	Name:	MotorMan -
	Subject:	Buying a new prop - Need Help
	Date:	5/30/2005 4:04:26 PM

First try trimming up the out drive until you hit your max rpm. I have a 23" 3 blade you can try. It is for a Mercucy V-6 o/b, but I think they interchange. It is a "ventilated" prop. That means it allows some exhust gas to ventilate out causinng the prop to "slip" at low speed. The rpm's go up at low speed, allowing the engine to gain rpm into the power band. You get a better hole shot. The ventilating stops as boat speed increases. If you have a 21" and you are only hitting 5200 rpm, the 26" you mention will only bog down the engine.
Avoid 4 blade props. More wetted area means more friction loses. They are for pulling skiers.

You may already have more prop than you need. Ideally, You should hit max rpm with the correct prop. But if that is 5500, there is not much left. You are unlikly to hit 60mph with just a prop change. A very clean bottom is a must.
rule of thumb:
A boat that can hit 60 needs twice the hp to hit 80..
ken@alabamabass.com
What is the red line on this engine?
Ken

Other messages in this thread:

View Entire Thread

Buying a new prop - Need Help - Chevy4x4 - 5/22/2005 1:46:58 PM

Buying a new prop - Need Help - MotorMan - 5/30/2005 4:04:26 PM

Buying a new prop - Need Help - Chevy4x4 - 5/30/2005 11:07:05 PM

Buying a new prop - Need Help - MotorMan - 5/30/2005 11:53:00 PM

Buying a new prop - Need Help - MotorMan - 5/31/2005 1:08:29 PM

Buying a new prop - Need Help - Osms - 5/31/2005 10:43:07 AM

Buying a new prop - Need Help - Chevy4x4 - 5/31/2005 1:57:40 PM

Buying a new prop - Need Help - Osms - 6/1/2005 11:17:04 AM

Buying a new prop - Need Help - GoneFishin - 6/4/2005 2:11:48 PM

Buying a new prop - Need Help - ShoeFly - 6/7/2005 11:22:20 AM

Lake Martin Prop Shop - LifeTime Laker - 6/6/2005 9:16:03 AM

Lake Martin Prop Shop - SCARAB MAN - 9/14/2005 4:06:34 PM

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