[danielvf]

Here's a video of the helicopter chainsaw

http://youtu.be/Mfz1YrpMbBg

[JoeAltmaier]

Wow very different. Mine had no cable or a very short one - the chainsaw was directly under the helicopter.

[parfe]

More like this? https://youtu.be/rF1vfMM3W08?t=133

[zo1]

They also used one of those in a James Bond movie. Goldeneye, I believe.

Edit. It was in The World is Not Enough, as someone else noted.