ric wrote:
Using a prop slip calculator.... it estimates the 8.1 prop pitch is 18 from the factory to do 44 mph @ 4500rpms.
The 5.7 has a top speed of 37mph @ 4500rpms. Inputting that data into the calculator with you the 8.1 gear ratio, it calculates a 15 pitch prop is needed to match the four winns specs.
I'm not sure of the actual pitch of the DP props though, and it seems to be nearly impossible to get that data. What is a fact though, you will need to step down a few sizes.
If I were to throw a dart on what prop you "might" need, I'd say F3. See if you can borrow a set from your mechanic. Somebody somewhere has to have a used set laying around that you could throw a deposit on, and get $$ back when returned.
On a duo-prop type drive, the props are in "sets"...these Sets are numbered in a fashion that reflects the "Set", not the pitch of 1 of the props...in reality, 1 actually has greater "bend" or twist than the other, but the "set" is given a value. So since you do not know the actual pitch of the front and rear prop on a Duo Prop drive, the prop slip calculator you used is worthless, as is your "calculated" information you have so graciously provided._________________
One of 4 Previous (Sold) Boats:2000 Four Winns 268 Vista
Current Boat: 2004 Chaparral
235 ssi cuddy
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