nodeko Flinging Gliders. To be honest I’m not sure what the name flinging means with regard to this glider. So far as I can tell it is a linked double glider with a secure hook attached to the leading glider.
There are two versions of these flinging gliders, one which has roller runners and is described by nodeko as a flinging hook. Both what I term the standard flinging glider and the roller version have a lockable curtain hook.
NOTE sold in quantities of 1, photo for illustration.