If there is any possibility of a shock load in any lifting proceedure, then it should really be planned out at the initial stages, however when lifting weights that "Could Move" a good idea would be to use either a strop or Roundsling on the object to lift/transport and attach that to the winching wire, so any sudden movement of load or alteration of lifting plane would be absorbed by the Strop/roundsling.
I have used roundslings on coils of steel up to 25tonnes in weight , the coils are not always concentric in shape and the effect of weight on one side of the imaginary centre spindle has in the past sheared lifting cables rated at 50tonnes , further , lifted weight that drops then requires the crane gearboxes to be stripped and crack tested, so I would think a heavy weight suddenly released from a heli would also have a similar effect somewhere in the system!
Peter RB
Vfrpilotpb
