Oso
Premium Pilot
I've always thought the issue was some sort of out of balance situation, be it props or motor.It's odd how some get cracks but (most presumably) don't.
Could it be an unbalanced prop or motor?
Or even some other factor like ill-fitting case?
Mine has done a fair few flights since May and no sign of any cracks.
It's always windy here. You would think if the design or material were inadequate they would all get the same thing sooner or later.
In the OP's case, it looks to me that he previously glued his shell which transferred stress down the arms to where it now cracked just beyond where the glue stopped.
Note that I am just speculating from the picture. I don't know for sure if he previously glue his shell. It seems likely however.
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