The STAL Dovern was a Swedish

turbojet The turbojet is an airbreathing jet engine which is typically used in aircraft. It consists of a gas turbine with a propelling nozzle. The gas turbine has an air inlet which includes inlet guide vanes, a compressor, a combustion chamber, and ...

design of the early 1950s, named after a lake in

Finspång Finspång () is a locality and the seat of Finspång Municipality, Östergötland County, Sweden with 12,440 inhabitants in 2010. Overview Finspång is a traditional industrial town. The first industries were established in 1580 when a Royal fact ...

municipality in

Östergötland Östergötland (; English exonym: East Gothland) is one of the traditional provinces of Sweden (''landskap'' in Swedish) in the south of Sweden. It borders Småland, Västergötland, Närke, Södermanland and the Baltic Sea. In older English li ...

Sweden Sweden, formally the Kingdom of Sweden,The United Nations Group of Experts on Geographical Names states that the country's formal name is the Kingdom of SwedenUNGEGN World Geographical Names, Sweden./ref> is a Nordic country located on ...

. Intended to power the

Saab 35 Draken The Saab 35 Draken (; 'The Kite' or 'The Dragon') is a Swedish fighter-interceptor developed and manufactured by Svenska Aeroplan Aktiebolaget (SAAB) between 1955 and 1974. Development of the Saab 35 Draken started in 1948 as the Swedish air fo ...

, this aircraft was powered by the

Rolls-Royce Avon The Rolls-Royce Avon was the first axial flow jet engine designed and produced by Rolls-Royce. Introduced in 1950, the engine went on to become one of their most successful post-World War II engine designs. It was used in a wide variety of ai ...

instead. The Dovern did not enter production.

Design and development

The

STAL STAL (Svenska Turbinfabriks AB Ljungström; "Swedish Turbine Manufacturing Co.") was an industrial company established in 1913 in Finspång, Sweden, by the brothers Birger Ljungström, and Fredrik Ljungström, developing the Ljungström turbi ...

company had been designing steam turbine engines and in the 1940s begun designing

gas turbine A gas turbine, also called a combustion turbine, is a type of continuous flow internal combustion engine. The main parts common to all gas turbine engines form the power-producing part (known as the gas generator or core) and are, in the directi ...

engines. Their first running engine was the ''Skuten'', ground tested in 1949 but not flown. The Dovern was the next design, featuring a nine-stage

axial compressor An axial compressor is a gas compressor that can continuously pressurize gases. It is a rotating, airfoil-based compressor in which the gas or working fluid principally flows parallel to the axis of rotation, or axially. This differs from other ...

and single-stage turbine. First run in 1951, the engine was flight tested during 1953 using an

Avro Lancaster The Avro Lancaster is a British Second World War heavy bomber. It was designed and manufactured by Avro as a contemporary of the Handley Page Halifax, both bombers having been developed to the same specification, as well as the Short Stirlin ...

provided by

Air Service Training Air Service Training (AST) is an organisation in Perth, Scotland, that has been training engineers and pilots for airlines, maintenance organisations and the military since 1931.

. The engine was installed underneath in a

nacelle A nacelle ( ) is a "streamlined body, sized according to what it contains", such as an engine, fuel, or equipment on an aircraft. When attached by a pylon entirely outside the airframe, it is sometimes called a pod, in which case it is attached ...

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

being preferred.Gunston 1989, p. 165.

Applications

(test bed only) *

(intended application)

Variants

;Dovern :Base variant. ;Dovern IIA :Basic engine without de-icing ;Dovern IIB :Compressor

bleed air Bleed air is compressed air taken from the compressor stage of a gas turbine upstream of its fuel-burning sections. Automatic air supply and cabin pressure controller (ASCPCs) valves bleed air from high or low stage engine compressor sections. Low ...

system added for ice protection. ;Dovern IIC :

Afterburning An afterburner (or reheat in British English) is an additional combustion component used on some jet engines, mostly those on military supersonic aircraft. Its purpose is to increase thrust, usually for supersonic flight, takeoff, and combat ...

version producing thrust.

Specifications (Dovern IIB)

References

;Notes ;Bibliography * Gunston, Bill. ''World Encyclopedia of Aero Engines''. Cambridge, England. Patrick Stephens Limited, 1989. * {{Swedish military gas turbine aeroengines 1950s turbojet engines

Design and development

Applications

Variants

Specifications (Dovern IIB)

See also

References