Specialized high-altitude interceptor. Standard armament for pre-WWII fighter with
liquid cooled engine: cannon firing through the propeller shaft and pair of synchronized machineguns. Fuselage was made
of wood, wings - duralumin. Main landing gear - retractable backwards with 900 turn, tailwheel also retractable.
Aircraft was flown since August 1940. It performed very well, but TK-2
turbochargers were faulty and failed to
deliver before the German invasion.
Turbochargers problems and bureau evacuation resulted in cancellation of the Su-1.
"History of aircraft construction in the USSR" by
V.B.Shavrov, Vol.2 p.48-49;