Finding right prop for 20' seacraft.

[FishStretcher]

Originally Posted by Bushwacker

You're running the same setback as I am with an even heavier motor, so you will definitely need a 4B prop to get some stern lift and maybe some sort of fin on the AV plate, for decent low speed planing.

I second that one. I am a big fan of the hydroshield skeg mounted fin. You can plant at slow speed, and you slowly settle the boat coming off plane, rather than a noticeable transition. I bought a Solas Amita 4 blade prop for stern lift, too. About $100 in aluminum, not sure if there is a SS version.

[Bushwacker]

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.