I own A Hammond challenger v2150
it does about 60 mph with an chevy 454 330hp
saw some threads with the same boat and smaller engine that was doing just about 70mph. dont really know what to do to pick up some speed. got an older version of the ASD6 drive unit (Borg Warner 1721). Anyway I,m looking for a new prop since i chrashed my last one A Rolla 3 blade chopper propeller with the short hub 4" 16x22 Someone who knows if i can pick up some speed with a different propeller? What would be the right model to go then?