Designed in 1940, the Borovkov-Florov No.10 was a cantilever biplane with no struts and wires. The upper wing is “gull” type, lower is “inverted gull”. The aircraft featured tricycle landing gear, because tail part was occupied by a DM ramjet and there were no place for the tailwheel. The ramjet (already tested by Borovkov and Florov on the I-207/3) was used only for short time as a booster. When it wasn’t active, the inlets were closed by special doors.

 

The No.10 was designed as a test high-speed maneuverable fighter, escort fighter, and dive bomber.

 

Engine: 1x Shvetsov M-71 (1700/2000 hp); 1x Merkulov DM ramjet
Wing span: 9.5 m
Wing area: 24.0 sq.m
Length: 8.35 m
Takeoff weight: 3500 kg
Wing loading: 146 kg/sq.m
Max speed w/out ramjet: 650 km/h
Max speed with ramjet: 750-800 km/h
Climb to 8000 m (with ramjet active): 8.0 min
Flight range: 800 km
Armament: 1x 12.7 mm Berezin BS, 2x 7.62 mm ShKAS or 2x 23 mm cannons. 
Crew: 1