VFW SG 1262 Schwebegestell

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SG 1262
Expirimental VTOL APV in the Wehrtechnische Studiensammlung Koblenz.jpg
SG 1262 on display at the Bundeswehr Museum of German Defense Technology, Koblenz
RoleExperimental vertical take-off
National originGermany
Manufacturer Vereinigte Flugtechnische Werke
First flight5 August 1966 (first free flight)
Number builtOne

The German VFW SG 1262Schwebegestell (hover rig) was designed and built in 1965 by Vereinigte Flugtechnische Werke (VFW) as an experimental aircraft to assist with the development of several vertical takeoff and landing (VTOL) military aircraft types that included the VFW VAK 191B, the EWR VJ 101 and the Dornier Do 31 transport. The 1262 designation relates to the initial numbering of the VAK 191B project by Focke-Wulf. [1]

Contents

Tethered test flights were followed in August 1966 by free flights that included an appearance at a Hanover air show. Although the German VTOL programme did not proceed test results were used during development of the Panavia Tornado. The SG 1262 is displayed at the Bundeswehr Museum of German Defense Technology in Koblenz.

Background

As part of the development of the VFW-Fokker VAK 191B vertical take-off aircraft, it was necessary to configure and test the monitoring of its flight control system. In order to minimise costs and risks during the development of the 191B the SG 1262 rig was designed and built in 1966 to simulate essential functions. Of high importance was the necessity to test the fly-by-wire flight control system, a redundant flight controller and a self-diagnosis system. A total of approximately 650 hours of simulation time, 2,000 hours of test runs on system test benches and 6,900 hours of wind tunnel tests were documented during the design phase of the project. [2] [3]

Technical description

The aircraft was based on a trapezoidal frame without any skin panels. Deviating from the vectored thrust engine concept of the VAK 191B, five Rolls-Royce RB.108 turbojet lift engines with 9 kN (2,000 lbf) thrust each were mounted vertically. In addition to extensive sensor equipment, the rig used an auxiliary gas turbine for autonomous electrical power supply supply, it was also fitted with a Martin-Baker ejection seat. [3]

The control commands were transmitted via an electrical control (fly-by-wire) system with mechanical feedback. The flight control system had triple redundancy and double electro-hydraulic servo units with integrated self-monitoring. The control commands for the three axes were accomplished with compressed air nozzles that were actuated by a 280 bar (4,000 psi) high-pressure hydraulic system, movement of the main engines for control purposes was deliberately omitted. A direct mechanical back up of the compressed air control system was provided for emergencies. [3]

Operational history

40 tethered flights were initially carried out using a fixed telescopic apparatus before the aircraft flew in free flight for the first time on 5 August 1966. 150 free flights were made during the 18-month test program, including a demonstration flight at the 1968 Hanover Air Show at Hanover-Langenhagen. [3]

Despite the discontinuation of all German vertical take-off programs the findings from experiments with the SG 1262 and experience gained from the VAK 191B project were used by German engineers during the development of the Multi Role Combat Aircraft (MRCA) project which became the Panavia Tornado. [3]

Aircraft on display

The SG 1262 is preserved and on display at the Bundeswehr Museum of German Defense Technology in Koblenz. [4]

Specifications

Ejection seat and pilot's side console controls Schwebegestell SG 1262 pic2.JPG
Ejection seat and pilot's side console controls

Data fromFlugrevue [3]

General characteristics

Performance

See also

Aircraft of comparable role, configuration, and era

Related lists

Related Research Articles

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Vereinigte Flugtechnische Werke (VFW) was a West German aerospace manufacturer.

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Lockheed XV-4 Hummingbird Type of aircraft

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EWR VJ 101 Experimental aircraft by Entwicklungsring Süd

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Dornier Do 31 Type of aircraft

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Short SC.1 British experimental VTOL aircraft

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Rolls-Royce RB.108 1950s British turbojet aircraft engine

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Armstrong Whitworth AW.681 1960s British military transport aircraft design study

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Rolls-Royce RB.162 1960s British turbojet aircraft engine

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Tiltjet

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Rolls-Royce/MAN Turbo RB.193

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Hawker Siddeley HS.141 1970s British airliner design study

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NBMR-3

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References

Notes

  1. ↑ Taylor 1975, p. 245
  2. ↑ Kuckuk, Pophanken and Schalipp 2015, pp.154, 263, 273–274, 394–395
  3. 1 2 3 4 5 6 Flugrevue-Der deutsche Harrier www.flugrevue.de (German language) Retrieved:6 June 2022
  4. ↑ Bundeswehr WTS collection www.bundeswehr.de Retrieved: 6 June 2022

Bibliography

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