Prop Pitch

[Dick B in KY]

Hey Folks, I have a Whirlwind ground adjustable three blade on my SS with a 912ULS. Initial setting was 17 degrees as suggested by the factory, but this gives over 6000RPM at wide open throttle on the ground. Does anyone else run this prop/engine combination and if so what degree of pitch are you using? Thanks for any info.

Dick B

[darrellpralle]

I also have whirlwind prop on 912 ULS. 17 degrees is too flat. If I remember right I ended up at 20 degrees. John McBean told me it should turn 5150 rpm standing still at full throttle

[kmach]

Hi, with the 912 ULS your prop should be pitched to get 5100- 5200 static rpm to get decent overall performance. You can then adjust to your needs, if you like more climb or cruise.