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Armstrong Siddeley Lynx

Linx

The Lynx was a single-row version of the twin-row Armstrong Siddeley Jaguar engine. With a Bore/Stroke of 5 by 5 inches, it developed 150 hp, which was considered to be inadequate. The bore was increased to 5.5 inches, which gave a satisfactory output of 184 hp. Full engine statistics are available in the table below.

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The initial engine size of 11 litre produced a disappointing 150hp, increasing the engine size to 12.4 litres produced a satisfactory 187hp; accordingly, the engine was ordered into production.

 

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Over 6000 units were produced between 1920 and 1931 when the Lynx was superseded by the Armstrong Siddeley Cheetah.

Armstrong Siddeley Lynx.jpg
Lynx Ungeared
HE86b.jpg
Lynx Side View
Armstrong Siddeley Geared Lynx reduced again.jpg
Lynx IV Geared

Ipso

Avro Ten 3 Lynx Engines Mod.jpg
Avro 618 Lynx IVC
Avro 621 (1) Tutor Lynx IVC reduced.jpg
Avro 618 Tutor with floats Lynx IVC
Canadian_Vickers_Vancouver_Lynx IVC.jpg
Vickers (Canada) Vancouver Lynx IVC
Avro 504N with Lynx Engine.jpg
Avro 504N Lynx various versions
De Haviland Hawk-Moth (2) Lynx IVA.jpg
DH Hawk-Moth Lynx IVA
Airspeed Courier Lynx engine for home marker Cheetah for export.jpg
Airspeed Courier Lynx IVC
Armstrong-Siddeley_Lynx_IV_on_Avro_504N.jpg
Avro 504N Lynx IV
Morane-Saulnier_MS_230Nadkachna cropped.jpg
Morane-Saulnier 236 Lynx IVC
Avro Tutor Lynx IVC Shttleworth.jpg
 Avro Tudor Lynx IV        Credit RRHT

Leading Particulars of Lynx Engines

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Engine Type     7-cylinder, single-row air-cooled, radial aero-engine

Mk I.                  Bore/Stroke 5 x5 inch.   (127x127  mm).    Volume  671cu. in.  (11 litre)

All other Mks    Bore/Stoke  5.5 x5 inch  (127x139.7 mm)   Volume 756 cu. in.  (12.4 litre)

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Variants

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MK I             

    1920  150hp (110kW) Direct Drive, Plain Fan

Mk II

     1920 184hp (135kW) Direct Drive, Plan Fan.

Mk III   

     1924  200hp (147kW) Direct Drive, Plain Fan

Mk IV

     1929 180hp  (132kW) Direct Drive, Plain Fan

Mk IV(G)

     192? hp not known. Geared Epicyclic, Plain Fan

Mk IV(S)

     1929 Fully supercharged

Mk IV*

     1930 210hp (154kW) Direct Drive, Plain Fan

Mk IVA

     1930 188hp (138kW) Direct Drive, Plain Fan

Mk IVC

     1929 208/225hp (153/166kW) Direct Drive, Plain Fan

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Note: The plain fan had no supercharging effect.

Power Curve for a Lynx IV*

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Power curve rated at sea level from A. & A.A.E Martlesham, Report M265 dated 21.6.1933. 

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RPM             2,090         2,000        1,900        1,800        1,700      1,600

​BHP                227            221           213           203           198         181

Fuel 73 Octaine (DTD134)

Armstrong Siideley Lynx adverts and brochure images

ArmstrongSiddeley-Lynx-Siddeley Lynx.jpg
ArmstrongSiddeley-Lynx-1924-1 advert.jpeg
Lynx Brochure P 1 reduced.jpg
Lynx Brochure P 2.jpg

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