Michigan Wheel Corp. also makes an aluminum 4B, the "Vortex" that was a little over $100. I tried a 14 x 20p that was a little too much pitch for heavy loads, so I had repitched to a 14x18 that's perfect and I use as a spare. I finally ended up with a PowerTech SS 4B 15x15 prop that works real well for me with heavy loads. It uses the same 2-piece hub system as the Michigan. The Yamaha is down about 15 hp compared to the E-Tec, but I'm running a 1.87:1 gear ratio; if yours has a 2.0:1 gear ratio, you might be able to turn the same size prop on the lighter SF hull.
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