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  Prop on 90 merc on Montauk

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Author Topic:   Prop on 90 merc on Montauk
DeepSouthWhaler posted 06-25-2004 11:49 AM ET (US)   Profile for DeepSouthWhaler  
Would a 20" Laser II ss prop be a good selection for a 2005 90 HP Mercury 2 stroke (2.33:1 gear ratio & RPM range of 5000-5500) on a 1986 Montauk? The boat is rigged with two batteries at the stern and two 12 gallon aluminum fuel tanks under the RPS. The typical load consists of three people (maybe four) and an average amount of fishing gear.
Any comments would be greatly appreciated.
Clark Roberts posted 06-25-2004 06:21 PM ET (US)     Profile for Clark Roberts  Send Email to Clark Roberts     
Deep, a 20" Laser II should be ideal. I ran a 20" High Five on a 1977 Newport 17/90hp Merc 1995/6 and it would turn 5600rpm and touch 50mph on a cool day with light chop. Performance with the Laser should be as good. My hole shot was super strong and engine was turbine smooth. Try raising engine via mounting holes as high as possible (must keep cooling water flow) without breaking loose in turns and take off...the Laser props are designed to run high... happy Whalin'... Spruce Creek Navy
DeepSouthWhaler posted 06-26-2004 07:37 AM ET (US)     Profile for DeepSouthWhaler    
Thanks for the info. What hole do you suggest mounting the engine on?
Clark Roberts posted 06-26-2004 11:00 PM ET (US)     Profile for Clark Roberts  Send Email to Clark Roberts     
Since all transoms are not drilled with the hole pattern at same exact height it is hard to tell what hole on engine will be best. Adjust height so that anti-cavitation plate is approx 1 1/2 inches above keel. That should be just about right! happy Whalin'... Clark... SCN

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