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Old 05-02-2004 | 10:04 PM
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WMB
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From: Great Falls, MT
Default RE: Engine for 4*40
I've got a ST 51 on a 4*40. 10% nitro, 11x5 APC prop. It's fast and has unlimited vertical on a cooler day. I hate the way the muffler extension bolts to the cylinder. Other than that, it runs great.
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