deSitter
There is that, and it comes at a reasonable point in the turn for the pilot to start rolling out level for the show center pass. A Right Roll involves deflection of ailerons, left down, right up. this changes the lift and load on each wing. If the left wing exceeds its critical Lift, it will STALL, and the a/c will now reverse, and Roll Left. It is not a good thing, because it imparts Yaw to the airframe, and enormous loads on the Tail, and Heavy engine (see Machinbird, above). As the Nose drops, (increases the radius of the "turn"), speed/Lift is regained and the a/c (wing) starts to fly again. This is too quick for it to be under the pilot's control, it is simply what aircraft do. The upside is that the a/c recovers aero flight on its own. The downside is it overreacts, and starts a....phugoid. So the climb after the loss of the TailWheel structure was likely a natural, and the roll, descent at the top was a bottom wave of the phugoid.
If you look carefully at the underside of the a/c, you will see the ambient lighting flaring on the skin. This is not to do with the light, but with the orientation of the skin itself. This a/c, like most others, is basically a balloon when flying through the air. Pressure from the airstream forces the skin inward against its formers, and substructures, and a balance is reached relative to the speed, and attitude of the a/c. When a deviation in flight path or airloads occurs, the skin responds, as does the structure beneath it. A Stalled wing, for instance, will unload the skin and change the way the light reflects upon it. The a/c effectively, "bulges" where the pressure has released, and this is evident, along with a startling re-orientation of the airframe with the airstream, what you see as an emphatic 'wobble', producing large G deviations from "Normal".
This "Snap" roll left is not commanded, and it is definitely not reversed, by the pilot. It is far too quick to have been input by Leeward. I am magnifying the video to see if I can capture the Left aileron bulging in to the airstream at the TE, but so far...
Can this event have been instigated by the Trim Tab failure? Possibly. It would have also caused a Pitch UP, and an adverse and torsional roll also.
The Tail is seen rebounding from this torsion in a dramatic out of rig aspect with the wings, look closely, and see the airframe rock and roll with this out of rig condition. (It is quite brief, if it had continued, the a/c would likely have come apart at this point.) This misaligned and reorienting event may have produced what was heard as a pop. It is not impossible some substructures broke, or fractured. It may have been the TailWheel snapping away from its lock.
Last edited by Lyman; 1st Oct 2011 at 14:14.