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447 Backfire

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King Chicken

Active Member
Joined
May 20, 2013
Messages
38
Location
Oak Grove, SC
What would cause a rotax 447 to back fire at approx. 5500 RPM? Sounded like a shot gun firing.
Motor continued producing power and I could not find anything wrong after landing.
Does not seem possible to me but it did.
 
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