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Korolyev S.K.9
The two-seat SK-9 was designed by S.P.Korolev in 1934 - 1935 and was built at Osoaviakhim’s Planernyi Zavod (“Glider factory”, Tushino, near Moscow) in the Fall of 1935. The glider was built as a two-seater and had an unusual for sailplanes airframe: SK-9 had very high wing load and was capable to withstand loads up to 7g.
Chosen parameters were based on earlier experiments with BICh-11 glider, which was never flown with rocket engine just because light wooden airframe "expired" prior to arrival of the powerplant.
The SK-9 was an all-wooden aircraft. Box-type spars, ribs and 1mm plywood skin formed rigid box with strong resistance against bending and twisting. Fuselage of the oval crossection had 1mm to 1.5mm external skin and internal 1mm plywood skin for extra rigidity. Wing carried 2-section slotted ailerons covered with fabric.
Landing gear included a ski and fixed tailskid. The wooden ski was covered with steel and linked to the fuselage by set of rubber rings protected with fabric cover.
Pilot's and passenger cockpits - of the open type. Pilot is protected by small plastic windshield. Rear cockpit had a removable set of controls.
During the Fall of 1935 the SK-9 passed factory trials at Tushino airfield, performing number of flights both towed by the airplane and in free flight.
It was flown (towed by an R-5) from Moscow to Koktebel for participation in the XIth All-Union Glider Convention (September 6 – October 6, 1935) in Koktebel (it flew there from Moscow on tow, as part of an “aerotrain”, with Korolev onboard as a passenger). During overflight and at the Convention SK-9 proved its high performance and good handling at speeds up to 180km/h even in "rough air" conditions. During flight from Moscow to Koktebel and back the SK-9 was piloted by glider-pilot Romanov and S.P.Korolev himself (he was a licensed pilot too).
The SK-9 was designed to be converted into a Rocketoplane - aircraft propelled by a rocket engine, and was later converted into the RP-318-1 rocket-plane.
The SK-9 fuselage and leading edges of the wing were painted bright-red. Wing, tailplane, rudder and nose section of the fuselage - ivory. Landing ski - black.
Wingspan: 17.0 m
Wing area: 22 m2
Wing aspect ratio: 13.1
Length: 7.33 m
Height: 2.64 m
Empty weight: 300 kg
Loaded weight: 4605 kg
Wing loading: 23 kg/sq.m
Takeoff speed: 71-76 kph
Tow speed: 130-140 kph
Min glide: 85 kph
Normal glide: 100 kph
Max glide: 200 kph
Glide ratio: 19:1 (23:1 by another source)
Landing speed: 70 kph
Minimal descent: 0.94 m/sec
Normal descent: 1.4 m/sec
Crew: 2

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