Respect your opinion guys but, I think the key here is that the aircraft exhibited the exact same behavior in the first loop, although the pilot wasn't as far through the loop when it snapped and consequently the aircraft ended up virtually level and he flew away with no elevator required.

In the second loop, it stalled going over the top putting him in a nose down attitude and it's quite likely ( although no one can know for sure) that he pulled on the elevator to recover. I think it's too coincidental l that this happened in both loops while he was pulling elevator, you don't have to be slow to stall. You'll also notice , his loops were not round ( not critisizing his aerobatic skill here), just saying that he was starting to pull harder on elevator at the top of the radius when his speed was dropping.

Not saying it couldn't be a failure caused by the earlier flutter , just think it's odd that it happened twice at the top of his loops. Not sure how many previous flights were on the plane and if there was any earlier indication of it stalling with elevator?

As I said earlier, I had this happen to me on a Skymaster Hawk, scares the crap out of you, your first instinct is that you've been hit because you loose control. You expect to stall at a slow speed but not at a medium clip. In trying to regain control, you can easily over control it and stall again. I was lucky, had enough altitude (although almost ran out of it) to regain composure and speed and gently pull out. Reducing the elevator control on the next flight completely tamed the beast.

Mike

Mike