RK-800, RK-I, RK Push-Pull by G.I.Bakshaev
S uccess of telescoping wing of the RK inspired
G.I.Bakshaev to proceed with another unique project, RK-800. Unlike the
RKtechnology demonstrator, new aircraft had high aspect ratio tandem wings and
conventional tail. For low speed takeoff/landing telescopic 'glove' sections were extended from the fuselage, covering both
tandem wings - except ailerons and slats on the trailing edge of the rear wing.
Aircraft was designed around new M-105 engine and intended for breaking
800km/h speed barrier at 2000m (so RK-800 designation). Project was analyzed by
TsAGI and VVS experts and approved
(1938). Speed expectations were slightly lowered to 780km/h.
In late 1938 Governmental Order was issued to built a single-seater fighter
based on the RK-800 concept, but with more powerful M-106 engine. Goal was to
achieve 800km/h. Aircraft was designated RK-I (Razdvizhnoe Krylo, Istrebitel) and had to be presented
for State Trials in 1940.
G.I.Bakshaev was a civilian designer, and it was not easy to find industrial
base for military project. Finally, in 1940 only full-size mockup was built and
tested in TsAGI wind tunnel. Conclusion was positive, and construction of aircraft
started.
In cruising configuration RK-I was of all-metal construction with main undercarriage retractable backwards into fuselage.
Tailwheel was also retractable. Fuselage was built of duralumin, radiator was located behind the cockpit to provide necessary
space for telescoping sections. Wings - wielded of upper and lower halves made of rolled steel. Ailerons, elevators and rudder -
aluminum.
Telescoping sections had aluminum leading edge and ribs, covered with fabric. Total weight of those sections was
330kg. In retracted position they were completely hidden inside the fuselage, covered with the end-plate. Retraction
was performed by wire mechanism, driven by electric motor.
Aircraft was built, all its mechanic functioned properly. But V.Klimov was late with
M-106 engine, and RK-I was never flown. Even before the German Invasion,
G.I.Bakshaev was reassigned to supervise mass production of the
U-2 trainer, considered as more important...
Two-engine version with additional pusher propeller at extreme tail remained on paper.
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