I think a separate engine powers the saw. I know someone who has a cabin in the mountains of Virginia and he has seen the same operation for clearing away trees from the transmission lines.
"... the saw unit has its own horizontally opposed engine in the box at the top of the chassis and that box is connected to the belly hook with a pipe, not a flexible line. The anchor point has a U-joint, a release and the pilot can control the swivel, so he can run the saw in a direction that is different than the chopper is pointed. This is so he can cut along a line in a strong crosswind. "
Although you can't really tell if it referes to the saw in the video or the one's he seen.
I think I saw something like that in a James Bond movie (I think). The bad guys carved up a wharf with it, I thought it was just some sort of movie gimick. I wonder what sort of endorsment it is on the 'chopper (Sling mounted chain saw ?)
That's got to be the world's biggest "chainsaw". Skilled or not, I wouldn't want to be the pilot. Besides, how in h3ll would you get the training to do it? Amazing to say the least. Hats off to him.
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