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Wanting to swap stainless steel props with someone

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skronkman
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Wanting to swap stainless steel props with someone

Postby skronkman Sat Jul 11, 2015 3:42 pm

After taking out my new boat and messing about in it on the water I have discovered that I am way over pitched on my propeller. I have a Mercury Vengence Stainless steel 13x18P (might be 13.5x18P) model number 48-16988 18P perfect condition. It fits many outboard makes and models but it's on my '09 Mercury 115HP 4 stroke. I want to swap with someone who might be under pitched on a similar quality propeller (Quicksilver,Mercury,Solas,etc) I believe I need a 13 to 14 inch propeller with a pitch of 15 to 16 inches. So call it a 13x16P to a 14x15P. If you are interested in a swap or have one you want to sell please get in touch with me.

Cheers,
Mick


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mrfisho
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Re: Wanting to swap stainless steel props with someone

Postby mrfisho Sat Jul 11, 2015 4:59 pm

What do you mean by over pitched ? What is it doing ? Cavitating ? or no guts ?

cheers
Mick


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AlphaPrime
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Re: Wanting to swap stainless steel props with someone

Postby AlphaPrime Sat Jul 11, 2015 5:26 pm

probably not getting maximum revs.. is this the case skronkman?


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Re: Wanting to swap stainless steel props with someone

Postby AlphaPrime Sat Jul 11, 2015 5:31 pm

What rpm are you getting at WOT?


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bigissmall
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Re: Wanting to swap stainless steel props with someone

Postby bigissmall Sat Jul 11, 2015 6:19 pm

Don't you just LOVE BOATS :)


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skronkman
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Re: Wanting to swap stainless steel props with someone

Postby skronkman Sat Jul 11, 2015 6:29 pm

Yeah, not revving out. Max rpm on the motor is 6400 but at WOT I only get 5300. I haven't checked if the leg is too low yet but I think the cav plate lines up with the bottom of the hull. I could try raising it an inch but I don't think that will make up the extra 700-1000 rpm I want to achieve.
Thanks for the input.


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bigissmall
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Re: Wanting to swap stainless steel props with someone

Postby bigissmall Sat Jul 11, 2015 7:22 pm

Why do you want to ring its neck? i have two yamaha 70s and can not get near the max rev's but cruise along at 20knots in the bay and out the front and 30 at a push.


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skronkman
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Re: Wanting to swap stainless steel props with someone

Postby skronkman Sat Jul 11, 2015 7:36 pm

I don't won't to wring its neck :) I believe that you are suppose to select a prop that will allow you to get close to the max RPM at WOT for the best performance and least strain on the outboard. Being over pitched on your prop is like driving up a hill in too high of a gear in your car. It's not good for the motor or gearbox.


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AlphaPrime
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Re: Wanting to swap stainless steel props with someone

Postby AlphaPrime Sat Jul 11, 2015 7:39 pm

Its better and you should do it because its actually putting strain on the motor and not working as efficient as it should. So what i mean by that is if the prop pitch is too big the motor has to work harder to spin it. which will make your boat take longer to get up on plain, wont hit its true top speed and wont be as fuel efficient.

So in other words.. having a prop thats too big is actually ringing its neck.

Skronkman doesnt have to sit it at WOT 6500rpm at all ever.. but when he is three quarter throttle he will be sitting nicely at 4-5krpm not 2500-3000rpm..

Cheers, Anth


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AlphaPrime
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Re: Wanting to swap stainless steel props with someone

Postby AlphaPrime Sat Jul 11, 2015 7:41 pm

Here is a good little page that explains outboards and props.

http://www.yourboatguy.com/index_files/prop.htm


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