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09-06-2010 | 08:42 AM

#34

av8tor1977

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From: Tucson, AZ

RE: Mac 85-SX 21cc

The general rule is to go down one inch when going to a 3 blade. So a 13 to 14 x 6 3 blade should do it. I recommend a 6 inch pitch for an airboat.

AV8TOR

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