SkwerI
Treehouser
That right there is a perfect example of why you want any aerial device level before flying the boom. Gravity always works.
The rotation gear is the weakest link on any aerial device. Setting up on a slope means it is stressed pulling uphill and slammed swinging downhill. You're absolutely correct, looks like it sheared the gear.It almost looks like the rotation gear sheared off, or he hit the wrong lever and panicked.
I saw this vid in a compil on youtube, with the sound. The broken gear has my vote too. There's a clear "tac !" just before the wild swing.It almost looks like the rotation gear sheared off, or he hit the wrong lever and panicked.