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I think that I would paint that particular area with some neon paint to eyeball at every pre-flight...and post-flight
til there's a resolution
The plans call for those rear fuselage longerons to be 0.040". Those longerons in the photos look way lighter than this, maybe like 0.020". That would be the first thing I would be checking.
I am aware that I have exposed my plane to hard conditions (i.e. crossing the Andees ) but isn't it the ch701 a sky jeep?
I am sure have not hit the rudder tail in a take off nor landing maneuver, this hypothesis is discharged.
I would like to ask you all if the planes that have had the same problem that I had, use frequently the slip maneuver.
If all those damaged planes use a lot (which is my case) to slip, it means that is the origin of the problem. From the other hand if this damage is not present in planes that have not slip, it confirms the problem cause.
I don't think a slip would cause this. I have seen aircraft bang their tails when tied down outside in high winds. Could that have happened?