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91 FS Surpass II prop

Old 09-13-2007, 04:13 PM
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Default 91 FS Surpass II prop

Bax:
What is the best prop for the 91 Surpass II and what RPM number should I look for? The engine is going to be mounted on a Kaos and I would like to keep it rather slow.

May I consider a 3-blade prop ? (I'm worry about ground clearence)

Thanks and regards.

Old 09-13-2007, 05:31 PM
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Default RE: 91 FS Surpass II prop

15 x 4W slow and low

14 x 6 a bit faster

nitro content u could be 8800-10200 rpm
Old 09-14-2007, 09:45 AM
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Default RE: 91 FS Surpass II prop

On the test stand, we normally use an APC 12 x 10 propeller. We expect to see the engine turn in the high-9,000's. Any prop that will do this is OK as long as it flies your model as you desire. So a 14 x 7 should also be OK. The main thing is to target RPM. Turn the engine in the mid to high-9,000's when on the ground and leaned to just rich of peak RPM and that propeller's OK. You should try different propellers to see how they fly your model.
Old 09-14-2007, 09:54 AM
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Default RE: 91 FS Surpass II prop

Bax, thanks very much....

12 x 10 sounds good to me, but I guess I should expect more speed.

What 3-blade could I try?

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