Another prop question, suggestion - The Hull Truth

nccoaster · 02-10-2005, 07:11 PM

Just pulled the prop off my Johnson OP 150. It is a 15 x17 aluminum prop. Hole shot is great, but I am looking for more top end. The motor is on a 20' Sea Hunt Escape. With 1/2 fuel (30 gals)and 2 people, she will do 38 (GPS) wot 5500, trimmed out. Seems slow to me. Any suggestions.

Posted this in the prop expert thread and it got lost.

nccoaster · 02-10-2005, 10:09 PM

.....chirp......chirp....chirp

gf · 02-10-2005, 11:03 PM

Quote:

With 1/2 fuel (30 gals)and 2 people, she will do 38 (GPS) wot 5500, trimmed out.

That does seem low.* My essentially similar McKee Craft will go 46 MPH and I'm spinning a 15.25" X 15 prop on my Yamaha 150.* Do you have a T-top?

Maybe try something like a*Bombardier Viper in a 14.75" X 19.* As long as you're above 5000 RPM at WOT with that prop you'll probably pick up some top end.

nccoaster · 02-11-2005, 08:57 AM

Don't have a t-top., thanks for the help. Really appreciated. THT is THE source for boating info.

thomby33 · 02-11-2005, 09:25 AM

Definitely not getting the speed you should. Are you trimming the motor up? What hole is your motor mounted on?.. your RPM is at the high end for a 2stroke, so I would have to guess your prop is not accurately pitched and is very passively cupped if at all. I have a Sea hunt 220 with a TTop, a F150 and even with 90 gls. of gas and 3 people I hit 42mph GPS. I have a 14.5 by 17p SS Silverado and am currently running a 4blade SS Typhoon and also hit 42 w/afull tank. My weight has to be @ 500lbs more than your setup.

Are you sure your speedo or GPS is not set at knots?

nccoaster · 02-11-2005, 10:55 AM

LOL, I did check the GPS, it is MPH.and by the way this was lake tested.(no tide)