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Here's some data from Boat Test that I found. 280 Sundancer with similar weight but with a 350 MAG/300 hp and running same Bravo iii drive and 21" pitch props. This is what I want to mimic. If anyone else has similar issue I hope this helps. Thanks again to all. Test Results RPM MPH KNOTS GPH...

Yes I have the Merc 4x3 standard 16x20 front and 14.3x20 rear props. I'm roughly 6-7 seconds to plane and that not having to slam it full throttle. I talked to the folks at Hill and they did recommend their 4x4 20" pitch set that is precupped a little. What do you mean by "hull dependent"...

Yes, These are the same props that the 320 hp had and I re-powered due to high hours and oil leaks on the old engine. I'm probably thinking too much into this however, my slip at WOT is roughly 16% and at 4200 rpm my slip calculates out to 25%. I used the Theoretical speed vs Actual speed...

Thanks

Thanks I'll try them.

I'm trying to get just a little more cruise speed from my 270 Amberjack. I recently re-powered with a new 6.2 Horizon MPI 350 hp from an original 6.2 320 hp. My current prop is 16 x 20 4 blade front and a 14 3/8 x 20 3 blade rear. WOT is 5400 @39-40 mph I cruise @ 4200 rpm with 26-27 mph, I...

I'm getting ready to rebuild my 6.2 MPI Horizon engine with 1060 hours on it. I plan on beefing up the HP to 360-370 range and trying to get the torque up as well hopefully @ 450 ish. Currently with the stock 16 x 20 & 14 3/8 x 20 dual prop on a Bravo III with 2.20:1 gears i get the following...