Engineering:Tsybin RSR

Short description: 1959 reconnaissance aircraft prototype by Tsybin

RSR
Orthographically projected diagram of the Tsybin RSR
Role	Reconnaissance aircraft
Manufacturer	Tsybin OKB-256
Designer	P. V. Tsybin
First flight	7 April 1959
Status	Prototype/project
Primary user	USSR

The Tsybin RSR (Reactivnyy Strategicheskiy Razvedchik, Cyrillic Реактивный Стратегический Разведчик, Russian for "jet strategic reconnaissance") was a Soviet design for an advanced, long-range, Mach 3 strategic reconnaissance aircraft.

Development and design

In 1954, the design bureau headed by Pavel Tsybin started development of a ramjet-powered supersonic strategic bomber, the RS. This design proved impracticable, and a smaller derivative, the 2RS was proposed, which would achieve intercontinental range by being air-launched from a modified Tupolev Tu-95 bomber.

This too was unsuccessful, with the aircraft unable to return to base if used on an intercontinental mission, while being incapable of carrying a thermonuclear bomb. The design was therefore revised again to a reconnaissance aircraft capable of operating from conventional runways, the RSR. As ramjets could not be used for take-off, they were replaced by turbofans.

The RSR was primarily of aluminium construction, with a long circular-section fuselage, which housed a pressurized cabin for the pilot together with cameras and fuel, with thin, low-aspect-ratio trapezoidal wings. The engines, two Soloviev D-21 turbofans, were mounted at the tips of the wings. The aircraft had a bicycle undercarriage, with outriggers under the engine nacelles. It was planned to cruise at greater than Mach 2 at a height of 20,000 m (65,600 ft) giving a range of 3,760 km (2,340 mi).

A simplified, full-sized aerodynamic prototype for the novel layout, the NM-1 was built in 1957. Intended for low-speed handling tests, the NM-1 had a steel-tube fuselage with duraluminium and plywood skinning. This aircraft, powered by two Mikulin AM-5 turbojets first flew on 7 April 1959. Based on the results of these trials, the RSR was redesigned (as the R-020) to make it more manoeuvrable at high altitude (it was proposed to carry out barrel rolls to avoid surface-to-air missiles). More conventional Tumansky R-11 turbojets (the engine used in the MiG-21) replaced the unavailable Soloviev turbofans. Five R-020 airframes were virtually complete, only awaiting engines by April 1961, with another 10 planned, when Soviet Premier Nikita Khrushchev cancelled the program.

Specifications (R-020)

Data from Soviet X-Planes, The Osprey Encyclopedia of Russian Aircraft 1875–1995

General characteristics

• Crew: 1
• Length: 28 m (91 ft 10 in)
• Wingspan: 10.66 m (35 ft 0 in)
• Wing area: 64 m² (690 sq ft)
• Empty weight: 9,100 kg (20,062 lb)
• Gross weight: 19,870 kg (43,806 lb)
• Fuel capacity: 10,700 kg (23,589 lb)
• Powerplant: 2 × Tumansky R-11F turbojet engines, 38.64 kN (8,686 lbf) thrust each dry, 60.65 kN (13,635 lbf) with afterburner

Performance

• Maximum speed: 2,600 km/h (1,600 mph, 1,400 kn) at 12,000 m (39,000 ft)
• Maximum speed: Mach 2.44
• Range: 4,000 km (2,500 mi, 2,200 nmi)
• Service ceiling: 22,500 m (73,800 ft)
  
• Take-off run: 1,200 m (3,900 ft)
• Landing run: 800 m (2,600 ft) with brake parachute

See also

Aircraft of comparable role, configuration and era

• Bristol 188
• Lockheed A-12

References

Bibliography

• Butowski, Piotr. "Steps Towards 'Blackjack': Soviet supersonic intercontinental bombers before the Tu-144". Air Enthusiast. No. 73, January - February 1998. Stamford, Lincolnshire: Key Publishing. Page 36-49. ISSN 0143-5450.
• Gunston, Bill. The Osprey Encyclopedia of Russian Aircraft 1875 - 1995. London: Osprey, 1995. ISBN:1-85532-405-9.
• "Plane Facts:Soviet strategic reconnaissance". Air International, February 1977, Vol 12 No 2. Bromley, UK:Fine Scroll. p. 98.

External links

• Tsybin RSR
• Tsybin NM-1
• Clip Tsybin NM-1
• Clip Tsybin NM-1