M.Dusing - German & Austro-Hungarian Aero Engines of WWI. Vol.3 /Centennial Perspective/ (66)

Strack monoplane with 2 propellers (1911).

Форум - Breguet's Aircraft Challenge /WWW/

High-wing monoplane built by the Strack Flugzeugwerke of Duisburg; a completely open model of tubular metal construction, fitted with a two-cylinder rotary engine which drove two counter-rotating propellers.

M.Dusing - German & Austro-Hungarian Aero Engines of WWI. Vol.3 /Centennial Perspective/ (66)