Fast Fours Mechanical Advantage System
The Fast Fours is a simple variation on a standard set-of-fours. The difference is that the far end of the rope is not terminated on the bucket of a pulley. Instead it is run through another progress
rope Archive
Members: Rope Grabs and Slip Value
Rope grabs: when will they slip? There are many rope grabs used by technicians including: Personal ascenders Attachment devices for raising people and loads Attachment devices for positioning people and loads Just how much can each of
Members: Auto Lock Belay and Slip Value
Auto locking belay devices: when will the rope slip? There are many auto-locking devices used by technicians as: Personal descenders Anchored devices for lowering loads Anchored devices to hold tension while raising loads Just how much can
Members: Backup Device on a Loaded Rope
Rope technicians use many different devices to attach to their back-up rope. These vary significantly in design and there have been suggestions that some may be more effective than others if the backup rope is supporting any