I survived an unexpected twisting of my ASH-25 wing a few years back.
The situation was as follows; speed 145 knots, altitude 50 feet (finish
line). After receiving my "Good Finish JJ", I initiated a climbing left
turn to exchange speed for altitude, about 30 degrees nose up and
banked 45 degrees left to reverse my track, to land on the ramp 1/2
mile behind me. To my surprise the ship kept rolling left. I applied
full right aileron and rudder and it stopped rolling left, but fill
right control input didn't make the ship roll back to level flight. As
I climbed and speed decayed, my right turn command eventually became
effective and the ship rolled out to level flight.

The next day I spoke to the fellow that was on the finish gate. He said
the inboard portion of my wing was bent up in the normal high speed
bow, but my left wing tip was bent down. He said my wing looked like a
sine wave!

Why did this happen? I believe the left wing tip dug in as I applied
left turn control at high speed. The aileron input caused the outboard
section of the left wing to twist (L/E down) resulting in the tip
digging in and giving me much more roll than I had commanded.

Why did I survive? Because I was in a climb and my airspeed was
decreasing. As speed decayed, the wing un-twisted and normal control
was restored. Had this happened from level flight, I believe the wing
twist (digging in) would have quickly resulted in a nose down attitude
and I don't believe it would be possiable to recover from this
situation. The wing tip is dug in and causing an un-commanded roll
which will shortly cause the nose to drop resulting in even more speed.
Opposite aileron won't (can't) make it roll out and back stick won't
(can't) make it slow down, it will only tighten the spiral dive.

After this experience I placed a personal maximum speed on the ship of
120 knots and was careful to limit my aileron input to about 50% of
full throw at that speed. I told the new owner about my experience and
recommended he adopt these limits.

Is this what happened to Ivans and Egan?

JJ Sinclair