STAL Dovern
The STAL Dovern was a Swedish turbojet design of the early 1950s, named after a lake in Finspång municipality in Östergötland, Sweden.[1] Intended to power the Saab 35 Draken, this aircraft was powered by the Rolls-Royce Avon instead. The Dovern did not enter production.
| Dovern | |
|---|---|
 | |
| Type | Turbojet |
| Manufacturer | Svenska Turbinfabriks AB Ljungström |
| First run | 1951 |
| Major applications | Saab 35 Draken (intended) |
Design and development
The STAL company had been designing steam turbine engines and in the 1940s begun designing gas turbine engines. Their first running engine was the Skuten, ground tested in 1949 but not flown.[2] The Dovern was the next design, featuring a nine-stage axial compressor and single-stage turbine. First run in 1951, the engine was flight tested during 1953 using an Avro Lancaster provided by Air Service Training. The engine was installed underneath in a nacelle faired-in to the Lancaster's bomb bay. After several thousand hours of ground running and more than 300 hours of flight testing the engine was not selected, the Rolls-Royce Avon being preferred.[3]
Applications
- Avro Lancaster (test bed only)
- Saab 35 Draken (intended application)
Variants
- Dovern
- Base variant.
- Dovern IIA
- Basic engine without de-icing
- Dovern IIB
- Compressor bleed air system added for ice protection.
- Dovern IIC
- Afterburning version producing 45 kN (10,200 lbf) thrust.
Specifications (Dovern IIB)
Data from Flight.[4] Jane's 1955-56[2]
General characteristics
- Type: Turbojet
- Length: 3,850 mm (151.57 in)
- Diameter: 1,095 mm (43.11 in)
- Dry weight: 1,220 kg (2,690 lb) dry
Components
- Compressor: Nine-stage axial flow
- Combustors: Nine combustion chambers
- Turbine: Single-stage
- Fuel type: Aviation kerosene to D.Eng R.D. 2482
- Oil system: Dry sump with gear pressure and scavenge pumps at 240–310 kilopascals (35–45 psi)
Performance
- Maximum thrust: 32.29 kN (7,260 lbf) at 7,200 rpm at sea level for take-off
- Overall pressure ratio: 5.2:1
- Air mass flow: 54.9 kg (121 lb) / s
- Turbine inlet temperature: 870 °C (1,140 K; 1,600 °F)
- Specific fuel consumption: 0.009 kg/(kN h) (0.92 lb/(lbf h)
- Thrust-to-weight ratio: 2.76:1
References
- Notes
- "Sjöareal och sjöhöjd" (.pdf) (in Swedish). Swedish Meteorological and Hydrological Institute. Retrieved 12 April 2014.
- Bridgman, Leonard (1955). Jane's all the World's Aircraft 1955-56. London: Jane's all the World's Aircraft Publishing Co. Ltd.
- Gunston 1989, p. 165.
- Aero engines 1954 - Flight - 9 April 1954, p. 467 Retrieved: 6 June 2012
- Bibliography
- Gunston, Bill. World Encyclopedia of Aero Engines. Cambridge, England. Patrick Stephens Limited, 1989. ISBN 1-85260-163-9
- Kay, Anthony L. (2007). Turbojet History and Development 1930-1960 Volume 2:USSR, USA, Japan, France, Canada, Sweden, Switzerland, Italy and Hungary (1st ed.). Ramsbury: The Crowood Press. ISBN 978-1861269393.