And your bite wins you the prize, it is indeed Rub's Paddle-wheel aeroplane/flying machine
!!
There appears to be confusion in Rub's first name in my source, but I believe it was Wilhelm.
Ludwig Rüb SchaufelradFlugzeug / Schaufelrad-Flieger. The best translation into English could be a Paddle-wheel aeroplane.
Wilhelm Rüb (born in 1863 in Ulm) startet from humble beginnings as a shoemaker. Around 1880 he got interested in mechanics and started work in factories. Eventually he met an early aviation pioneer Alois Wolfsmüller, who apparently injected Rüb with enthusiasm for aviation.
Eventually Wilhelm Rüb got the financial help of Count Zeppelin in 1899 to realize his Paddle-wheel aeroplane, the idea of which was based on principles of Georg Wellner, Professor of the Technische Hochschule Brünn, some ten years earlier.
The design made by Rüb was for the technique of that time too advanced, so after the building of a model to prove the feasability and the making of (a few) parts, the agreement with Count Zeppelin ended on April 4, 1902 having spent 30.000 Mark (!).
The model seen in this Challenge was specially made for an exhibition in 2006 in the Zeppelin Museum Friedrichshafen. This exhibition focused on Zeppelin planes (heavier than air), to show that Count Zeppelin also had a large influence on the development of heavier than air machines.
evansb has control! 