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Looking for assistance with Mercury Tracker 40 hp outboard
On Mon, 17 Aug 2015 17:43:26 -0400, Justan Olphat
wrote: On 8/17/2015 2:36 PM, wrote: On Mon, 17 Aug 2015 13:04:24 -0400, Justan Olphat Your boat fits nicely in the workboat catagory. Proper prop size is whatever allows your engine to attain WOT mfg. suggested RPM. Your prop is probably larger in diameter and shallow pitch. Probably 12 pitch. It goes a little deeper than just matching RPM to prop diameter and pitch. High performance boats want the exact opposite of "big foot". They have as small a gearcase as possible to reduce drag but they are easier to break and low speed performance suffers. OK Work boat ;-) BTW 14x11 It still comes down to WOT RPM. What do you mean by low speed performance? Isn't that something that matters to work boats more than recreational or high performance boats. Hole shot is the only thing I can think of that might interest some recreational boaters. Low speed performance just means maneuverability, particularly when you have wind and current. That might be a work boat situation or just trying to get to the dock at a crowded restaurant. Swinging that big prop allows pretty big steering inputs at fairly low RPMs. I shortened the steering arm on my motor so it turns farther than Yamaha or Mercury had in mind. I can do some pretty tight turns in close quarters. |
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