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  Best prop for 90hp Merc on smirkless 16'7" Hull?

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Author Topic:   Best prop for 90hp Merc on smirkless 16'7" Hull?
NHKatama posted 05-28-2003 12:05 AM ET (US)   Profile for NHKatama   Send Email to NHKatama  
Well at long last My boat is in the shop getting the new 90hp Merc 2s installed. My shop advises me to stay with an alum prop. I at some point would like a SS prop.

Anyway, what prop would be best for this boat (best pitch and diameter) opinions on both the alum as well as the SS prop please.

I brought in my T&H 2 screw Jackplate, and my shop said that they would mount my engine on it, but said it will not improve the ride or performance on this boat. Most threads I have read on this forum, say that a jackplate is a very good idea, on this boat, and that it helps the ride on a smirkless hull in chop. Is there any downside to having them mount my engine to the jackplate?

Well anyway tell me what you guys think. I need to let the shop know tomorrow or Thurs which prop I want, and if I want the egine on the transom or on the Jackplate.

Thanks again guys, ~~~~Pete

newt posted 05-28-2003 07:45 AM ET (US)     Profile for newt  Send Email to newt     
On my '84 Montauk with the same motor I am running a Mercury aluminum 12-3/4 x 21" prop.

Or maybe it was 13-1/4 diameter....can't remember, but I will check tonight. Either way, the pitch is 21".

If my tack is correct, I can exceed the max rpms of 5500 when lightly loaded, but not by too much. Top speed is 42-43 mph, and the hole shot is sufficient to send everything to the stern.

Hope that provides a reference for your smirkless Hull.

Pbob posted 05-29-2003 01:18 PM ET (US)     Profile for Pbob  Send Email to Pbob     
17'Alert Series, 90hp Merc. Bob's Racing hydraulic jackplate. 24" pitch×13"dia Lazer II. Boat goes 50+ at 5600rpm. There is nothing but good that can come from a jackplate, setback, vertical position and height for speed, lower height for stability in chop.
lhg posted 05-30-2003 03:13 PM ET (US)     Profile for lhg    
Pbob sounds like a guy who knows how to make a Merc 90 run. Clark Roberts has reported similar performance with the same combo.

An aluminum prop is not the best for the 90 on a 16/17. The previously mentioned Laser II is the way to go, providing the engine is up 1"-2". If a 24" pitch sounds high for your application, the 22" will definitely work, with a top speed capability of 49. I run Laser II's on both of my Whalers.

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