Q-500 Racing Discuss AMA 428, AMA 424, and any other variants of Quickie 500 racing

APC 8.8x8.5??

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Old 11-13-2012, 10:09 AM
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jaka
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Default APC 8.8x8.5??

Hi!
What prop to use in 428 pylon?
Engine is a Nelson LS. APC 8.8x8.5 or what?
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Old 11-13-2012, 11:08 AM
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Default RE: APC 8.8x8.5??

8.8x9.25
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Old 11-13-2012, 01:38 PM
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jaka
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Default RE: APC 8.8x8.5??

Hi!
Even for 10% nitro ?? That's what we use in sweden.
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Old 11-14-2012, 06:45 AM
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Default RE: APC 8.8x8.5??

No one that I'm aware of uses 10% nitro in the States, so disregard any references unless they say they are using that fuel.
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Old 11-14-2012, 09:02 AM
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Default RE: APC 8.8x8.5??

Hi!
I have tried 8.8x9.00 but using 10% nitro I think that prop size is too big, loads the engine too much. 8.8x9,25 would be even worse.
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Old 11-14-2012, 09:33 AM
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Default RE: APC 8.8x8.5??

I would agree with that Jan, stick with the lighter pitch props, shoot for a peak RPM around 20,000 and back off about 500 and find something that works.
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