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ADC Cirrus


The 4-cylinder ADC Cirrus engines were originally built by ADC Aircraft until Cirrus Aero Engines Limited was formed in 1927. The company became Cirrus-Hermes in 1931 when it was bought by the Cirrus-Hermes Engineering Company and later became the Cirrus Engine Section of Blackburn & General Aircraft Limited in 1934, and operated as a separate division until production ended in the post-World War II era.

Cirrus's first product was the 90 hp (67 kW) Cirrus I, which passed its 50 hour type rating in 1925. It was the first air-cooled inline engine, a design by Frank Halford that proved extremely popular for light aircraft. The basic layout (using one cylinder bank of an ADC Airdisco V-8 engine) was quickly copied by a number of other manufacturers. Later versions named the Cirrus II, and Cirrus III were produced each with slightly greater displacement, and power (Cirrus II - 85 hp, Cirrus III - 90 hp).

The next model line, Cirrus-Hermes I, II, and IV were produced ranging in power from 105 hp to 140 hp depending on type. The later Cirrus engines were designed to run inverted.

 

ADC-Cirrus-01
Jan 1949

 

Variants:
Cirrus I (1925)
Cirrus II (1926)
Cirrus III (1929)
Cirrus IIIA (1933)
Cirrus-Hermes I (1929)
Cirrus-Hermes II (1930)
Cirrus-Hermes IIB (inverted) (1931)
Cirrus-Hermes IV (1930)
Cirrus-Hermes IVA (1929) Inverted engine

Applications:

Cirrus I
Avro Avian
Avro Baby
de Havilland DH.60 Moth
Short Mussel
Westland Widgeon

Cirrus II
Avro Avian
de Havilland DH.60 Moth
de Havilland DH.71 Tiger Moth
Piaggio P.9
Short Mussel
Westland Widgeon
Bloudek XV Lojze

Cirrus III
Avro Avian
Blackburn Bluebird
Cierva C.17
de Havilland DH.60 Moth
de Havilland DH.71 Tiger Moth
Dudley Watt D.W.2
Klemm L.26
Klemm L.27
Short Mussel
Simmonds Spartan
Spartan Arrow
Westland Wessex
Westland Widgeon

Cirrus IIIA
Miles M.2 Hawk

Cirrus-Hermes I
Avro Avian
Blackburn Bluebird
de Havilland DH.60 Moth
Desoutter I
Hawker Tomtit
Hendy 302
Parnall Elf
Saro Cutty Sark
Simmonds Spartan
Southern Martlet
Westland Wessex
Westland Widgeon

Cirrus-Hermes II
Avro Avian
Blackburn Bluebird
Desoutter I
Spartan Arrow
Spartan Three-Seater
Westland Widgeon

Cirrus-Hermes IIB
Arrow Active
BFW M.23
Klemm L.27
Koolhoven F.K.44
Koolhoven F.K.45
Spartan Three-Seater

Cirrus-Hermes IV
Avro Cadet
Hendy 302
Miles M.2 Hawk
Percival Gull
Spartan Cruiser
Spartan Three-Seater

Cirrus-Hermes IVA

Avro Club Cadet
Blackburn B-2
Blackburn Segrave

Specifications:


Cirrus I
Type: Inline, air-cooled, upright 4-cylinder piston engine
Bore: 4.13 in (105 mm)
Stroke: 5.12 in (130 mm)
Displacement: 274.36 cu in (4.5 L)
Length: 45.8 in (116.3 cm)
Width: 18.26 in (46.4 cm)
Height: 34.3 in (87.1 cm)
Dry weight: lb ( kg)
Valvetrain: 1 inlet and 1 exhaust valve per cylinder
Fuel system: 1 Claudel carburettor
Fuel type: 70 octane
Cooling system: air
Power output: 60 hp ( kW)
Compression ratio: 4.7:1

 

 


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