Posts: 433
Location: Cedarburg, Wisconsin | I'd definitely get the motor heigth right first, or as right as possible with that prop. Then when you change props you'll see some predictable difference. If you are dragging the anticavitation plate, you're just wasting hp and the speed will remain pretty constant even with the rpms going up and down. Judging from what I saw on my rig when I tried a Trophy Plus, it definitely gets a better bite than my three blade prop and needs more venting on the holeshot (Take out some PVS plugs). I'd keep raising the height until your water pressure drops too far or until you start to blow out when the boat breaks onto plane.
When changing props the diameter can have a pretty big effect even if the pitch stays the same if your present prop has double digit slip or practically none at all. I went from a 23" Solas to a 23" Tempest Plus and it was 100 less rpms and 4 mph faster results, just from running with less slip do to the increased diameter and maybe blade geometry.
I'd think a 17 pitch Trophy would be in the ballpark when the motor is raised. It gives you some nice lift and you don't have that nasty motor torque driving the left side of the boat down at low trim levels you get with the Tempest.
Edited by Almost-B-Good 5/24/2010 2:43 PM
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