One of my new favorate oldies...

The Junkers W-33, Russian Dobrolet and Aeroflot designation PS-4 (Pochtovii Samolet 4) was an all-metal cantilever low-wing single-engined aircraft. Powered by 1 Junkers L-5 in-line water-cooled six-cylinder engine, this aircraft was capable to reach top speed 185 kph and fly 1000 km with cruise speed 150 kph. W-33 has a ceiling 4700 meters and posses a flight duration up to 5 hours. 
