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  17 Montauk, prop pitch, engine height?

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Author Topic:   17 Montauk, prop pitch, engine height?
Wild Turkey posted 03-01-2001 07:29 PM ET (US)   Profile for Wild Turkey   Send Email to Wild Turkey  
I need everyone's advice. I know this has been discussed in depth in the past. It would be a great if I could have some help with my specific situation:

I took the Wild Turkey out this weekend to stretch her legs... the performance details:

88-17' Montauk, 88 Evinrude 90HP, 19 pitch alum. prop., engine mounted on lowest hole

WOT upwind - 42.8 mph @ 4900 on GPS
WOT downwind - 44.1 mph @ 5100

I think I need to raise the motor 2 notches, right? (OMC specs WOT 5500 rpm) and add a Doel-Fin.

What about a SS 19 pitch prop. Would that reduce rpm too much? (someone told me that a SS prop can be cupped more than alum, more bite, lower rpm)

Thanks in advance for the professional help. I don't know what I would do without this forum. Thanks jimh

Dick posted 03-01-2001 08:21 PM ET (US)     Profile for Dick  Send Email to Dick     
My 1999 rigging spec sheets show a Merc 90 installed one hole up. We did find that with some heavier motors one more hole up was necessary.
I am running a Merc 50 4 stroke on my Montauk and when I switched to a SS prop I lost a little hole shot put picked up a couple mph on the top end.
I may break down and try a Doel Fin this spring, have allways been against them but all the talk here is on the plus side.
compounder posted 03-01-2001 10:16 PM ET (US)     Profile for compounder  Send Email to compounder     
jimh, you don't state clearly what the problem is you are trying to solve, but if it is the low rpm's, I think I would try a 17in. prop. This seems to be the most popular pitch prop for Montauks and it should raise your rpms's at least 2-300.
Tom W Clark posted 03-01-2001 10:30 PM ET (US)     Profile for Tom W Clark  Send Email to Tom W Clark     
Wild Turkey,
I agree with compounder. A 17" pitch prop is what you need. If you get a stainless 17", so much the better. You are correct that the cupped edges effectively increase the pitch, but only very slightly. The biggest performance advantage to stainless is that its thinner blades result in less drag wich means less resistance for the motor and more speed. You may be able to raise your motor one notch, but watch out for ventilation. That's always the trade off: top speed vs ventilation or cavitation.
Wild Turkey posted 03-02-2001 10:06 AM ET (US)     Profile for Wild Turkey  Send Email to Wild Turkey     
Sorry... I didn't mean to sign my post- jimh. I was just thanking jimh for the forum.

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