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Old Aug 08, 2003, 03:00 AM
Dr1Driver
Guest
n/a Posts
Re: Prop for OS 70 Surpass / Goldberg Tiger 60 kit

>The OS manual recommends a broad range of props for the engine:

Higher pitch/smaller diameter props will give you more speed and less pull.
Lower pitch/larger diameter props will give you the opposite. Unless it's a
pylon racer, I've found most sport planes to be plenty fast enough with a
"pull" prop.

The OS website (www.osengines.com) recommends 11x8-9, 12x7-8, 12.5x6. Start
with the 12.5x6 or a 13x5.




Dr.1 Driver
"There's a Hun in the sun!"
Old Aug 08, 2003, 03:01 AM
Dr1Driver
Guest
n/a Posts
Re: Prop for OS 70 Surpass / Goldberg Tiger 60 kit

>Maybe...but they can sure take a beating before breaking!

Yup, and between being inefficient and flexing, the true pitch is about 3/4 the
ratred pitch. APC can't be beaten.
Dr.1 Driver
"There's a Hun in the sun!"
 


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