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ContinuousWave: Whaler Performance
Best prop for 90hp Merc on smirkless 16'7" Hull?
|Author||Topic: Best prop for 90hp Merc on smirkless 16'7" Hull?|
posted 05-28-2003 12:05 AM ET (US)
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
posted 05-28-2003 07:45 AM ET (US)
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.
posted 05-29-2003 01:18 PM ET (US)
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.
posted 05-30-2003 03:13 PM ET (US)
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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