I experimented with props both last year and this year. Last year was with a 21" Rev 4, which proved to be too large. This year, I tried a 21" Laser II, which is still on the boat.
The stock prop was a 21" Black Max aluminum. So far, the Laser II has dropped RPM's by about 400, and the speed is down as well. Since this summer was somewhat time-challenged on the water, I didn't have the opportunity to do more scientific testing, eliminating other variables, and doing a head to head alum/SS test under identical conditions.
I will say one thing about the Laser, it was far more efficient than the aluminum blade, and gave the boat better steering control, and much better cruising attitude.
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