The EPO foam hinges are weak : repetitive mechanical movements of the surfaces end up breaking the very thin EPO foam fixing them.

Here a video of a crash we had because of the loss of the left aileron in mid flight at 30 m altitude, and how I made repairs and reinforcements on it afterwards.

I would advise to reinforce the hinges right from the initial build to avoid any accidents; this is what I will do from now on having learned it the hard way...



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I like to use Amazing Goop to strengthen hinges and leading edges on EPO foam models.  Just apply a very thin coating and let ti dry.  It slightly melts the surface of the foam and forms a very tough "skin" over it.


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