I am not sure if this makes any sense bit are DLG gliders free flight. I ask as they have no form of power other than the initial throw and then thermals/wind etc.
I know they have control surfaces (rudder/elevator/aileron) but does this take it entirely out of free flight?
Here's my best efforts to date which might show the basis of DLG.
https://youtu.be/rpWRRpijq9c