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Phil that is what I thought (lots of weight difference) and as tedious said B-4, I too can very seldom run flat out as the water is never that smooth and I'm happy with my top speed I just want a better hole-shot although at 35mph(6000 rpm) my 3-bladed Vengiance (13-5/8 x 14) is hardly slipping.

We'll try some 4-bladed props next spring when the water is thawed. With 200 hrs on the Merc I can never convince the Admiral to change to an F70 although I would like to try that set up on a 150, maybe 10 years from now when it is time to re-power.