Moderated Discussion Areas
ContinuousWave: Whaler Performance
Prop Pitch Question
|Author||Topic: Prop Pitch Question|
posted 06-30-2003 08:01 PM ET (US)
When I bought my 1983 22' Revenge Cuddy it came with an Evinrude 225 and three props. The owner said his prop of preference was pitched at 20 (and cupped), but he also had the motor sitting high and had a hydrofoil on the motor. Last summer I had my mechanic remove the hydrofoil and set the motor down as low as it would go, after experiencing some control problems offshore. Question is, what prop pitch would be right here? I'm thinking about getting one of the spare props re-pitched to 17 to see if that would make a difference. I'm getting about 1 gal./hr. running offshore at aroune 4000 rpms, and I rarely run offshore at more than 20 knots/hr. But the boat still feels a little goosey, and I get some overrev when hitting chop. What difference would a lower prop pitch make? Does anyone have a similar setup who can advise?
posted 06-30-2003 11:26 PM ET (US)
Well, you don't mention max rpms & thats what counts.
I certainly have huge doubts that the engine is able to twist a cupped 20p prop to it's max rpms.
My guess is it maxed out around 4,800 rpms.
OMC props are not noted for hanging on real well while trimmed out or in sloppy water.
I'v always said OMC props belong on electric motors in the bedroom on a hot night.
I would most certainly go to a 3 blade Stiletto 14.25 x 17.
I feel this prop is the best bang for the buck & hangs on far better then the stock props.
I'v experienced omc pro[ps blowing out in rough water & while trimmed high then switched to a performance prop From Stiletto & the whole picture changed for the better,....turned into a completely different boat.
posted 06-30-2003 11:30 PM ET (US)
As far as fuel economy, those 225s don't understand that the price of fuel went through the roof.
The best you will get is "MAYBE" 1-1/2 mpg, they are gas hogs from the day they were born.
Nothing seems to quench their thirst for fuel at alarming rates.
posted 07-01-2003 10:39 AM ET (US)
Thanks, Sal. I'm going to get one of the OMC props pitched to 17 just to see what happens. If my rpms improve, I'll consider a Stiletto.
posted 07-02-2003 11:17 AM ET (US)
On my 1990 Revenge 22 WT, I used a 14.25x17 stainless on my old 1989 Johnson 225 (rest in peace). Would get 5600 RPMs and 38 knots. I always tried to convince myself that I got 2 mpg. Cruising at 4000 RPM was about 23 knots.
posted 07-02-2003 02:49 PM ET (US)
My 225 gets about 2.5mpg at cruise(32mph @12-13gph). My Montauk on the other hand gets aout 10mpg.....gotta love 4 strokes and 70hp.
posted 07-02-2003 04:22 PM ET (US)
I checked it out this a.m. on the old prop. Moderate load, 5000 rpm at WOT. About 33 (nautical) mph on the GPS. I'll compare with the repitched spare prop when I pick it up tomorrow.
Purchase our Licensed Version- which adds many more features!
© Infopop Corporation (formerly Madrona Park, Inc.), 1998 - 2000.