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  MONTAUK 17: Engine Mounting Advice

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Author Topic:   MONTAUK 17: Engine Mounting Advice
pcrussell50 posted 08-05-2015 09:11 PM ET (US)   Profile for pcrussell50   Send Email to pcrussell50  
Hi CWW'ers. Long time no post for me. I got a classic hull Boston Whaler Commercial Products Montauk, with a heavy Mercury-branded Yamaha FourStroke, and a stainless Rapture propeller that I'm damned if I can find the pitch specifications. It's good for 6,000-RPM and mid maybe upper 30-MPH on GPS so I imagine it's pretty fine pitched.

[The engine is] currently in in the middle of the five mounting holes. I have a hoist handy and the time to put it in another hole if the middle hole is NOT the one recommended. Thanks for your input.

-Peter

Tom W Clark posted 08-05-2015 09:18 PM ET (US)     Profile for Tom W Clark  Send Email to Tom W Clark     
What Mercury-Yamaha four-stroke motor do you have on your Guardian 17 Peter?

Remove the propeller and find the part number. It may not be the optimal propeller.

Two-holes-up is usually good for most motors. Three-holes might be better, but that depends, to some extent, on the propeller

pcrussell50 posted 08-05-2015 09:30 PM ET (US)     Profile for pcrussell50  Send Email to pcrussell50     
Sorry. It's a 90-HP. I'll get back to you with the propeller specifications as I can. Thanks for the quick response.
pcrussell50 posted 08-06-2015 01:22 PM ET (US)     Profile for pcrussell50  Send Email to pcrussell50     
I pulled the propeller, and it's labelled on the exterior as a "Rapture". Once pulled, [a mark came into view that says] 13-1/4 x 15 Michigan Wheel. This [propeller] is on a heavy Montauk with a heavy Mercury-branded Yamaha FourStroke 90-HP mounted [two-holes up].
Tom W Clark posted 08-07-2015 10:58 AM ET (US)     Profile for Tom W Clark  Send Email to Tom W Clark     
I am not a fan of the Michigan Rapture. I recommend the 13-1/4" x 15" Stiletto Advantage

For boat as loaded as yours, I would like you to try the 14" x 15" Stiletto Star (aka Turbo Pontoon 1) as well.

tedious posted 08-09-2015 04:10 PM ET (US)     Profile for tedious  Send Email to tedious     
Peter, I have a Stiletto Advantage 13.25 x 15 for sale if you are interested. Used but in perfect condition. Contact info is in my profile.

Tim

pcrussell50 posted 08-09-2015 10:14 PM ET (US)     Profile for pcrussell50  Send Email to pcrussell50     
Let me think about it mate. I'm more intrigued by the idea of a bigger change, like the 14" x 15" Stiletto.

-Peter

tedious posted 08-10-2015 07:48 AM ET (US)     Profile for tedious  Send Email to tedious     
Peter, in the search for the perfect prop for my 15 / F70 combo I actually tried both the Advantage and the Star, in the same sizes Tom recommends for you with your heavier boat but bigger motor. I had the Advantage first, but was experiencing some porpoising, so wanted to try the stern-lifting Star. The performance in my application was very similar to the Advantage. You could feel that the Star had a bit more grip than the already-grippy Advantage, but it didn't seem to knock down the porpoising to any degree I could notice, and the Star had so much grip it would stall the motor in reverse when docking, so I went back to the Advantage.

From my experience (admittedly different than yours) the Advantage was a better all around performer - it's a bit easier to spin up to speed than the larger Star. But there really wasn't much to choose between them - I think you'd be happy with either.

Tim

pcrussell50 posted 08-12-2015 06:49 PM ET (US)     Profile for pcrussell50  Send Email to pcrussell50     
Thanks for that candid analysis, Tim. I will get back to you at some point and see if you still have your prop.

I've got a bigger fish to fry at the moment, which will appear in the maintenance thread.

-Peter

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