Cracks in the exhaust
system become "breakaway components" very quickly during
flight, and this can play havoc with the propeller if the
aircraft is a pusher type. Always conduct a careful
pre-flight for such indications. Note the finger pointing to
a crack initiation.
Personal experience has shown that
this type failure is generally caused by vibration, and or an exhaust
system that is too rigidly mounted. We have found that if you add a flex
joint to the system, or another spring mount it will eliminate the
cracking problem.
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