If a Robbo is dropped or put down hard and nearly level at impact , this can be seen after the event in the cross member at the rear of the cabin will show varying stages of deformity IE it wont be straight the bigger the bend the harder the hit, after that it in the other things like the tail boom drooping and the rotor mast moving(deflecting) so much that it will deform the roof around where it pokes out from the main body!