M.Dusing - German & Austro-Hungarian Aero Engines of WWI. Vol.2 /Centennial Perspective/ (65)

Experimental Grade aircraft, powered by a 4-cylinder engine. [1912]

Журнал - Flight за 1914 г.

THE LATEST IDEA FOR LOOPING THE LOOP. - Pilot Gustav Tweer has been making trial flights on the above machine, constructed so that he can land upside down if necessary, having, as is seen, chassis and wheels both above and below the plaaes. He has been flying this machine at Bork.

M.Dusing - German & Austro-Hungarian Aero Engines of WWI. Vol.2 /Centennial Perspective/ (65)