Lost in prop land
 

Deal is 04 27ft Fever turning a 28pitch bravo to 5100RPM using a 1.65 drive and only running 60mph. Speed is GPS and I have checked it by handheld. Thats like 27% prop slip? Any help would be great. And 496HO if that makes any difference.

prop could be out of wack.

a 28 on a 1:50 std length drive behind a hp 500 at 5200 ran 84 mph. this was on a 27 kryptonite single step. 5000 lbs. f 1 boat

Prop is perfect, I checked it first

27 % slip seems to indicate something out of whack. i would have prop checked by a second source.12- 15% is normal for a 4 bld sometimes less.

Actually with that propeller you are closer to 25% slip if the prop is stock. Has the propeller ever been repaired?

Before I get started, I know these hull have been around the block many times. Most run in the 12% (on Average Labbed prop range). I've had a few that are really tough to dial. Check the bottom. Make sure it is true. CG, drive height, what are we missing?

Thanks for the replies, I have check the bottom with a 4ft strait edge and found that its pretty tight to the bottom maybe a 1/16 gap in a couple spots at most so is that acceptable? When checking CG I believe you are talking about center of gravity I know how to check it on an airplane but have no idea how to on a boat. Last, when I measure my X dimension is it from center of prop shaft to pad bottom?

Thanks in advance......J

And the prop has the vent holes in it and looks perfect with no dings what so ever and the local prop guys say its fine. I dont know if its ever been repaired or not it came with the boat

somethings causing 25% slip. try another prop just for kicks. see if it makes a difference.

Do you have drive showers? I would think that potentially the cup may have been washed out of the
28P, possibly. Addtionally check you drive heigth may be condusive to a 5B.

Julie

This weekend I have a 26P bravo, 25 QIV, 24P Mach. Which one should I spin first?

Julie, I dont have a drive shower and I will measure my drive height this weekend from prop shaft center to keel.