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Best speed prop for a 91 FX

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Best speed prop for a 91 FX

Old 08-15-2015, 03:02 AM
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James c harrell
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Default Best speed prop for a 91 FX

I have a Bobcat 50 (51 in wingspan) that had a 61FX on it. I was not happy with the speed of the plane and I replaced the 61 with a 91. (FX) They are the same size as far as actual outside measurement and weight. Problem is, the 61 was swinging a 11-8 and that is close to the biggest diameter I can get. Maybe another inch. Question I have for you guys is what prop would you recommend? The plane is not really aerobatic so I would at least like to make it quick. Got to have some fun with it. The 91 is brand new, never ran, and is completely stock. Muffler carb and all. Any help would be appreciated.

Last edited by James c harrell; 08-15-2015 at 03:35 AM.
Old 08-15-2015, 05:39 PM
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aspeed
 
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No one else seems to know either, so I will guess something with oversquare like a 12-12 or 12-13" I am not into the 90 size but somewhere around that? maybe? I am sure other wiser folk would know more.
Old 08-16-2015, 05:12 PM
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James c harrell
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I was thinking of about the same but finding a pusher that size is not easy. I don't know if any one makes one.
Old 08-16-2015, 06:29 PM
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Check the Zinger web site. They make an 11x10. That would be about right for a stock OS 91. If your capable, some of the.larger
larger sizes would be a good starting point but I have a feeling the 11x10 will be the best choice.
Old 08-17-2015, 04:36 AM
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James c harrell
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Will have to get one.(11-10) I really don't want to go to a three blade. I have been told they are not as efficient. As far as speed that is.
Old 08-17-2015, 05:47 PM
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MJD
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Why ZInger - why not an APC 11-10? More efficient IMHO.

11-10, 11-11, 12-9, 12-10 would be my best guesses.
Old 08-18-2015, 01:23 AM
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I wish I could find a APC pusher in that size.
Old 08-18-2015, 04:46 AM
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I just looked up the plane. Good luck with a pusher with a high pitch. Maybe get a left hand crank made up? Good luck with that too.
Old 08-19-2015, 08:57 AM
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Hmm, limited choices!

Zinger 12-8 P
MA 13-8 3-blade trimmed down?

but higher pitch might be a big challenge. Now, if the engine turned CW..

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