Yo Yo gear

This is a type of rigging which enables lifting of weights in excess of the safe working load of the derricks. As given in the figure the heads of two derricks are placed close to one another and their whips shacked to each other via a strop which passes through a traveling block.In the figure, the total stress of 7 tons is equally shared by the derricks. As the SWL of the falls  aren't sufficient, gun tackles have been rigged as lifting purchases.

The traveling block is advantageous as in the absence of such an arrangement the whole load would come on one derrick alone in case one winch fails.

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