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  A Summons to the Oracles of Props

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Author Topic:   A Summons to the Oracles of Props
BillB posted 06-23-2003 07:55 PM ET (US)   Profile for BillB   Send Email to BillB  
17 Montauk with fiberglass bow platform
'96 90 hp 60 degree Johnson Oceanrunner
Light to medium load (I usually run solo/18 gal. fuel)
Mostly running the bays with the odd foray around Montauk Point out into the Atlantic a few miles

I'd like to top out in the forties, cruise in the mid to upper thirties and have a little bite for holding swells offshore. Possible?

Should I consider bow lift given the extra 100 lbs. or so that the platform adds forward ?

What do you guys think?

Thanks
BillB

Wild Turkey posted 06-23-2003 08:33 PM ET (US)     Profile for Wild Turkey  Send Email to Wild Turkey     
BillB:

I run a 19 pitch Michigan Rapture stainless steel prop on my 1989 Montauk with a 1989 V4 90HP Evinrude. It tops out at approx. 43 MPH @ 5600 rpm (light load). I do have a CMC setback plate and the cavitation plate is set about 1-1/2" above the bottom of the boat.

Here are some pictures of my setup:
http://mywebpages.comcast.net/chrisdearmon/1989BWMontauk.htm

I hope this helps. I think a 19 pitch SS prop is the way to go for your setup.

Chris

JohnJ80 posted 06-23-2003 11:06 PM ET (US)     Profile for JohnJ80  Send Email to JohnJ80     
What changes did you note with the setback plate over without the plate?

j.

Sal DiMercurio posted 06-23-2003 11:50 PM ET (US)     Profile for Sal DiMercurio  Send Email to Sal DiMercurio     
My buddy has a new montauk 2001 with a 90 Evinrude FICHT, not certaon what pitch he's running but he runs just a hair under 50 & cruises at 40 mph easy.
I'll check the size prop he's running, it's an omc prop, certainly not a performance prop.
That Michigan Raptor is close to a Stiletto, i feel it should be giving you more speed then your getting.
What diameter are you running?
Sal
Wild Turkey posted 06-24-2003 12:34 AM ET (US)     Profile for Wild Turkey  Send Email to Wild Turkey     
JohnJ80:

There were a couple of noticable changes before and after the setback plate. Most notably, the top speed increased from 40 to 43 mph. Also, the bow rides a little higher due to the engine setback. I feel this gives the hull a better ride in choppy seas than before. Finally, one disadvantage was reverse does not seem have the bite it had before the setback plate.

Sal:

It is a Michigan Rapture (13-1/4 x 19):
http://www.miwheel.com/MIWheel/products/outboard/rapture_main.htm#rapt

Also, I think I could jack the engine up a little more. I am just concerned about water pick up (I do not have a water pressure gauge). At WOT the engine turns the 19 pitch prop. 5600 rpm (5500 redline).

I guess I could install a water pressure gauge, jack the engine up to 2-1/2", and buy a 21 pitch prop. I might try it.....

Chris

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