Hey ARUP, must be intelligent life down here.

Even without video it's really impressive to see the details of the wing warping mechanism true to original. Great work!

By the way, my book about the evolution of sailplanes tells that the ailerons of the first version had nearly no effect, that's why they added those big flapping "warperons".

The book also tells that the D-tube wing was only one step in a series of innovations. First was a method to calculate torsional strength and rigidity of such hollow shapes, second was the thick airfoil and third the stressed skin/sheeting. Junkers had such cantilever wings before but these were multiple-spar designs. The designer learned about it when working there. He added the single-spar design.

Some pictures from the book attached.

The book claims the wheels were soccer balls.They used them for their low drag compared to conventional landing gear/wheels.

Google for "vampyr glider" to find pictures of the (one in a kind) original in the German Museum and a replica in the German Glider Museum.