Supra SL Prop RPMs and GPH

[Gearhead]

950 is a 15x13.

[Gearhead]

The OJ 951 was a failure. 15x14. It lowered rpm a lot!! I though I had a winner. Cruising was killer. 31 mph at 3500. Ballasted up. Wouldn’t get above 9 mph ��. I’m not sure what to try next. As for now I’m gonna keep the OJ950 I like it a tad better then the acme 2775.

[dakota4ce]

The OJ 951 was a failure. 15x14. It lowered rpm a lot!! I though I had a winner. Cruising was killer. 31 mph at 3500. Ballasted up. Wouldn’t get above 9 mph ��. I’m not sure what to try next. As for now I’m gonna keep the OJ950 I like it a tad better then the acme 2775.

Maybe add cup to a 2775—?


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[Ryann]

I've contacted OJ and they said the 950 is what they recommend. Not sure if my spare will be a 2775, 950 or something else.

[Gearhead]

The 950 works. But it runs same rpm as the 2775.

There is the acme 2773 which could work.

I might try and add some cup to one of my props and see if rpms come down at all.

It’s a shame that the motor has to run at 3800-4000 rpms to surf.

They will drop some if you run lower bow pitch, but then you loose some wave quality.

[dakota4ce]

I added cup to a 15x11 and it made a wonderful difference (can’t recall the prop number). It was for my MB Tomcat—about 1.5 years ago.

I was skeptical, but it was better for sure.


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[Gearhead]

I think this is my next move.

I guess I could ditch the lead too...... but who wants to do that!

[shockthis]

I am running 900lbs over stock and had 3 adults and 3 kids in the boat at 11.6( at 12.1 mph we run 3500-3600 rpm) mph and we running 3400-3500 rpms. I have a 2775 with a 450.
I have noticed that as soon as you change from a pitch of 8.5 to 9.5 the rpms climb from 3400 rpms to 3900 rpms. Maybe lower your pitch a bit and your motor will love you.

[dakota4ce]

Exactly this ^^

Seems like an SL450 reaches its limit with 1000+ added weight and 10+ degrees of pitch?

Maybe there’s a sweet spot prop yet?


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[Gearhead]

I am aware of the pitch and rpm issue. The wave is killer at a Pitch of 10. I can’t seem to hit anything lower then 10 with out using a ton of smart plate.