The Pumas have large rip-stop nylon bags with an aluminium frame at the opening. On the underside there is aprox 40' of rope. The socks are placed on the blades using an long aluminium pole, then tied off to the a/c this is normaly done in strong winds so you can only just get them on, you look like a mad butterfly catcher trying to catch a blade. The tailrotor is secured by placing "pins" (they look like tuing forks) at the blade root to stop them banging about. I have tested the socks in winds over 90 knots and they work just fine. I will try and dig up some pics.
