Re: 20SF with a 150 ETEC numbers
The Viper is actually the old OMC RAKER propeller revisited, with greater rake progression, more efficient cupping geometry, and more aggressive initial angle of attack on each leading edge. It's a pretty good propeller, but not really a sternlifter. It's more of a bow-lifter, with slightly increased rake progression to provide more whole-hull lift.
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Common Sense is learning from your mistakes. Wisdom is learning from the other guy's mistakes.
Fr. Frank says:
Jesus liked fishing, too. He even walked on water to get to the boat!
Currently without a SeaCraft 
(2) Pompano 12' fishing kayaks
'73 Cobia 18' prototype "Casting Skiff", 70hp Mercury
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