Can Chinooks Autorotate?
YES of course they can. They would never be allowed to leave the ground if they could not!
In fact the Chinook autorotates more gently than any other I have flown, even a LongRanger, in fact it floats like a thistledown with, if memory serves, quite lively Nr. The technique at the end of an EOL is quite different from a conventional helo in that there is no check in the sequence; flare, check, level... in fact you just flare it onto the deck on its back wheels rather like an aeroplane using the collective to control the Nr and it tends to float. float float. Wheels on and keep the nose up until it sinks down onto the front gear too, then use the brakes. This uses up a lot of distance. They may autorotate well, but you sure need some space to stop one one on the ground!
I hope after all these years my memory isn't playing tricks - this is how I seem to remember it!