www.iFourWinns.com

I have a friend that has a 1986 Four Winns 16' Freedom it has a 3.0 GM I/O w/ alpha one 140 lower unit. It has a 3 blade 19.4 aluminium prop that he is looking to upgrade to a SS prop. It comes up on plane real quick now and cruises great about 30 mph w/5 people in the boat.

What would be some good alternative sizes for him to use for a more top speed?

Your buddy would want to go with a 21 pitch prop. This will increase the rpm and top speed but hinder the hole shot. Here's a link that may help...It has been posted here many times by Walt.

http://www.go-fast.com/Prop_Slip_Calculator.htm

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Marc, Kathlin & Nathalie


'89 Chaparral Laser 32

'93 Vista 245, 5.8L w/ King Cobra

Former Boats
'01 H260, 7.4 VP Duoprop
'98 H200, 5.0 GL w/VP SX drive

Howdy,

That prop slip calculator is a great tool,


But there's really no way to determine what might be a "better" prop or correct pitch without knowing an accurate (WOT) speed (GPS), accurate RPM (from a verified tach) at that speed and the drive ratio. THEN you can use the Prop Slip calculator to determine which way to go with a prop.






Regards,

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1987 Four Winns Liberator 211, formerly OMC 460 King Kobra powered, replaced in 2006 by a 1997 Mercruiser 454/Bravo III

Where is the best place online to buy a prop?

What are some good brands and brands to avoid?

There are many good prop shops. I can personally recommend Midwest Propeller. http://www.midwestpropeller.com. It's a small shop run by a guy and his son, located in the middle of Nowhere, Kansas (about 5 miles from me), and they work on props sent in from marinas all over the world. There is nothing they can't do where props are concerned.

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Mike
2005 Four Winns 230/240
VP 5.7GXi/DP
1998 F-150 XLT
Boat Pic