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  What prop?

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Author Topic:   What prop?
Jiles posted 11-07-2002 04:21 PM ET (US)   Profile for Jiles  
I know this is a hard question, but I need some kind of idea as to what prop I need. I have a 1985 sport with 1985 Johnson 40. I weigh 175 pounds and have full mahogony wood and run a 6 gallon tank. I posted, on this site, a few days ago, that I could not identify the pitch of my prop(no identification at all). I took the prop to a prop shop, an they didn't have an interest in helping me. The boat will get on plain in approximately 4 to 5 seconds and turns 4,200 RPM at W.O.T. What, in your opinion, prop should I be running?
Bigshot posted 11-07-2002 04:33 PM ET (US)     Profile for Bigshot  Send Email to Bigshot     
probably a 12x15 or whatever they have. You may want to have the tach checked or does it sound like 4200? I assume a 13'. If a 15 I bet they still run the same prop.
jimh posted 11-07-2002 04:40 PM ET (US)     Profile for jimh  Send Email to jimh     
You can compute the pitch you need yourself. The procedure is well described in a recent thread. See:

http://continuouswave.com/ubb/Forum4/HTML/001191.html

Jiles posted 11-07-2002 05:02 PM ET (US)     Profile for Jiles    
Sorry, but I failed to state that the boat is a 13. I have never had a boat that would get on plane this fast. Yes the motor seems to be turning about 4,000. I have a new tachometer, that I assume is right. The boat will stay on plain at app. 2,800 rpm.

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