Originally Posted by
Kulwin Park
...The picture would indicate a stuck aileron, with a roll that they could not get out of. Just my read on it though.
Figure 10 in the report shows two frames from the video taken from the surviving Viper 1 (VH-DQJ). Wing damage on Viper 2 (VH-DZJ) is significant with ATSB reporting separation of the lower wing skin (which can be seen clearly) aside from likely damage to the right aileron controls.
In contrast, the damage to the wing of Viper 2 appeared to be much more superficial from the photos shown in the report.