A few years back I was qualifying an RTB system on a Mil-8, I was there with the latest and greatest electronic wizardry, but the primary method was the tracking flag method, i.e. chalk on the blades, and some poor sod stood out front with a rubber flap attached to a broom handle.
Oddly enough the ground track carried out with the man with the stick actually left the airacraft smooth as a cat pi$$ing on glass in fwd flight.. ergo, the techy RTB system was pointless!!
I'm afraid I don't have any photos though.. sorry.
