Finally worked up the courage to try looping my 450. I completed 3 foreward loops, shakey but pulled them off. The third involved an air to ground interface at the end. Not so pretty. Not terrible but will require some considerable repairs.
Landing skids torn off - looks to be repairable
Jesus bolt at head broken - have spares / probably have a bent mainshaft also have spares
Definite bent feathering shaft - have spares
Main gear missing teeth - have spare
Flybar - trashed have spare
So far all the servos look OK, main blades look OK, boom doesn't look bent, i'll have to do a little more investigating but that doesn't seem too bad.
Chalk it up to fly and learn, next time I'll do it better and higher!
If I get a chance I'll post pictures later.
Curt