STAL Dovern

Dovern
Type	Turbojet
Manufacturer	Svenska Turbinfabriks AB Ljungström
First run	1951
Major applications	Saab 35 Draken (intended)

The STAL Dovern was a Swedish turbojet design of the early 1950s, named after a lake in Finspångs 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.

Design and development

The STAL company had been designing gas turbine engines since 1935. 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: 1,095 mm (43.11 in)
• Diameter: 3,850 mm (151.57 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) / sec
• Turbine inlet temperature: 870 °C (1,140 K; 1,600 °F)
• Specific fuel consumption: 0.009 kg/kN/hr (0.92 lb/hr/lb)
• Thrust-to-weight ratio: 2.76:1

See also

Comparable engines

• Avro Canada Orenda

Related lists

• List of aircraft engines

References

Notes

1. "Sjöareal och sjöhöjd" (.pdf) (in Swedish). Swedish Meteorological and Hydrological Institute. Retrieved 12 April 2014.
2. Bridgman, Leonard (1955). Jane's all the World's Aircraft 1955-56. London: Jane's all the World's Aircraft Publishing Co. Ltd.
3. Gunston 1989, p. 165.
4. 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.