Update- the 13 x 15 4 blade pulls to redline, and when trimmed the same (nearly blowing out in turns) is a few tenths of a knot faster before redline. Top speed is really splitting hairs. But it gets there a lot faster and it is a little less trim sensitive. I love the holeshot. Trolling is a little more adjustable, too.
9% slip calculated for this 13 x 15" pitch four blade prop at 6000 RPM at 29.3 knots over ground
15% slip for the 12.75 x 17" pitch 4 blade prop turning 5600 RPM at 29.1 knots over ground
Quote:
Originally Posted by FishStretcher
Raising the motor one hole got me a little. Maybe a knot of speed, but only if I trim the motor to a point where it starts to ventilate a bit, I think. When I did that, I could jump on the throttle and slip or ventilate to get to 5900 RPM occasionally.
But the extra speed came at the same 5600 RPMs, steady state, withou crazy trim- so that's good. And the cable steering is better (lighter). But I need a hydraulic helm.
I will check throttle adjustment tomorrow. If that is correct then I will bolt on the 15 pitch. If not, then I will adjust it then try a top speed run again.
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