The 21in Viper was very slow out of the hole ... it sucked some air on tight corners even when the motor was trimmed all the way down.
Top end was great but the motor struggled. The 17in is much better right through the rev range.
It's a case of trial and more trial until you find what works best for you ... Good Luck Glehav 
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Cheers, Whitto.
Boats have been made out of Grass, Wood, Steel, Fiber-Glass, Carbon-Fiber, Rubber, Alloy and Concrete ... WHAT were they thinking ???
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