Prop selection for a 20sf w/ 130 Yamaha --Help--

[McGillicuddy]

Yeah, 13" diameter. 13x17 should be about right in 3 blade. The semi-cleaver geometry from Yamaha is probably a nice match. You can might try to borrow a decent one from a prop shop to see how it feels. If not find them like new on ebay for $50-80 in Al.

PT Props has nice SS called SCD3 and a 4 blade called SCD4. A four blade of that geometry would probably get you max efficiency and about 38 mph. You might need drop to a 15 or 16 pitch in the 4 blade. Good luck. Post some results.