| Hi Bill. The right hand rotation props are more common and cheaper to replace when damaged as well as being often in stock for shipment. I tried a 12 x 8 two blade on my electric and was bothered by vibration. A 12 x 13 three blade was far smoother. Check that you have sufficient tip clearance from the hull, deadwood and rudder. ie roughly 20% of the prop diameter, about 2.4 inches minimum for a 12 inch prop. Too close will cause rebound vibration between the hull and prop that is often not noticed with a noisy ICE originally installed. I have also found a 3 blade to be far better in reverse than a 2 blade. Also an 11 x 13 with 3 blades might have a lot less vibration because of separation from the hull being more and also give more torque for rough conditions. On a previous boat a 2 blade Minn-Kota could not reverse into a 10 mph wind while a 3 blade Motor-Guide prop modified to fit the same Minn-Kota motor was able to reverse into a 20 mph wind slowly. Speed in forward was virtually identical with both props. Hope this is helpful. Dave on "Day Dream Believer" --- On Sat, 11/6/10, Bill Spires <spiresac@yahoo.com> wrote:
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