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Author Topic:   OMC Shooter Prop
Dauntless17 posted 03-27-2002 12:47 AM ET (US)   Profile for Dauntless17   Send Email to Dauntless17  
I currently have a SS 12X19 4-blade prop for my 17' Dauntless dual console. I get pretty good acceleration, but WOT hits about 6000 RPM. I've also noticed a throttle setting on the engine that is set at the lowest possible position for top end so as not to blow the powerhead.

I found a good deal on an OMC 12.5X21 SS Shooter 4-blade prop. Any feedback as to the quality and expected performance of this prop? Should I alter the setting for throttle top-end with the new prop? Based on what?

Thanks for your help,

-Warren

Bigshot posted 03-27-2002 10:26 AM ET (US)     Profile for Bigshot  Send Email to Bigshot     
Warren...what engine and what setting are you talking about? Outboards do not have switches to govern speed, it should run WOT hwen at WOT unless cables are not adjusted properly.
Bigshot posted 03-27-2002 10:30 AM ET (US)     Profile for Bigshot  Send Email to Bigshot     
Ok I see you have a 115 Johnson, have you tried a conventional 3 blade? I am not sold on 4 blades yet unless running a jackplate or in rough seas where cavitation is detrimental. Every prop shootout I have read always points to the 3 blade for all around use and performance. On your rig I would assume a 13x19ss 3 blade would do you justice. try one.
Dauntless17 posted 03-27-2002 10:35 AM ET (US)     Profile for Dauntless17  Send Email to Dauntless17     
On my engine, the throttle cable causes a roller to rotate. There is an arm that is pushed by the roller which in turn moves a linkage connecting all four carburators.

There is a setting to affect the max amount the arm can be pushed by the roller. Mine is currently set to allow the arm to be pushed the minimum amount, I would expect limiting the maximum WOT.

I wish I had my service manual so I could use the proper terminology. Maybe someone can help me out here...

-Warren

stagalv posted 03-27-2002 12:37 PM ET (US)     Profile for stagalv  Send Email to stagalv     
Can somebody enlighten me on the advantages and disadvantages of running a 4 blade vs. 3 blade stainless prop on a Montauk. Is there a performance difference? Rex
Bigshot posted 03-27-2002 01:40 PM ET (US)     Profile for Bigshot  Send Email to Bigshot     
That might be timing....be careful.
Cruiser posted 03-29-2002 10:52 AM ET (US)     Profile for Cruiser    
I am not sure myself but I wouldn't mind somebody letting me know as well. My saw one on ebay I was thinking about buying but would like to know more about it first.
Hank posted 03-29-2002 11:09 PM ET (US)     Profile for Hank  Send Email to Hank     
Warren,
My '84 90HP Evinrude has automatic spark advance. There is a stop which limits max spark advance. If this is what you're talking about don't fool with it. It is properly set at close to max RPM with a timing light. The best way to do this is with a special wheel in place of the prop, in water. You can overspeed your engine if not done properly.
Hank
OutrageMan posted 03-29-2002 11:29 PM ET (US)     Profile for OutrageMan  Send Email to OutrageMan     
Very simply stated the differences are this.

1) 4 blade has better hole shot than 3 blade

2) 3 blade has higher top speed

3) 4 blade runs with less vibration

4) 4 blade has better holding power in rough seas

5) 3 blade has better fuel effincy (in many cases but not all)

3) 3 blades are generally cheaper

Remember that if you switch from 3 to 4 blades that you will probably have to go down 2" in pitch to account for the heavier prop and more blade surface area (possibly even more if going from aluminum 3 blade to stainless 4).

There are probably more differences but these are the basics.

Brian

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