Hi David, I have a 16D X 12P Martec Elliptec Mk III 2 blades folder (3GM30F) and it makes 5.8 - 6.2 at 2,850 - 2900 and 6.8 - 7.0 maxed-out (3400 rpm) with a clean hull . I don't know about it being "the best" prop. but it's cheap, simple, can easily be found used on eBay for a few hundred bucks, and it works reasonably well. (If you can't find the right blades used you can them separately)
The plus : Cheap and cheery :-) The big plus (If you race) known as the lowest drag prop while sailing The Minus(es): Mediocre stopping power in reverse / a fair amount of prop walk / some vibration (Not too bad) Having to line up the shaft at the right spot (To make sure the blades fold correctly) : We basically never have to touch it. The trick is to stop the engine while still in gear. It appears that where the compression stops the engine is precisely at the right spot to line-up the blades. Works fine for us. Regards, -Francois Rivard 1990 34+ "Take Five" Lake Lanier, GA
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