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B2538 Aircraft engine, Dragon Fly Mk II, WWI, single-row, radial, air cooled, nine cylinder, 320 hp, 1750 rpm, steel, designed by ABC Motors Ltd, made under licence by Sheffield Simplex Motor Works Ltd, Tinsley, Sheffield, England, 1919. Click to enlarge.

ABC Dragon Fly Mk II, 320 hp, 9-cylinder British WWI aero engine, 1919

Made in Sheffield, South Yorkshire, England, United Kingdom, Europe, 1919.

This is a Dragon Fly Mk II British WWI aero engine designed in England by ABC Motors Ltd and made by the Sheffield Simplex Motor Works at Tinsley, Sheffield, in 1919. More than 11,000 Dragonfly engines were ordered by the authorities to power British aircraft in World War I from seventeen manufacturers who were to produce the engines under licence from ABC Motors Ltd. A few were flown in aircraft but were close to disintegration after only a few hours running. The engine was not a success as it ...

Summary

Object No.

B2538

Object Statement

Aircraft engine, Dragon Fly Mk II, WWI, single-row, radial, air cooled, nine cylinder, 320 hp, 1750 rpm, steel, designed by ABC Motors Ltd, made under licence by Sheffield Simplex Motor Works Ltd, Tinsley, Sheffield, England, 1919

Physical Description

Aircraft engine, Dragon Fly Mk II, WWI, single-row, radial, air cooled, nine cylinder, 320 hp, 1750 rpm, steel, designed by ABC Motors Ltd, made under licence by Sheffield Simplex Motor Works Ltd, Tinsley, Sheffield, England, 1919

The Dragonfly aero engine comprises a nine-cylinder, single-row, air-cooled, radial engine designed to provide 320 hp at 1750 rpm. The cylinder assemblage was fixed relative to the aircraft fuselage while the propeller rotated with the crankshaft. Cam-driven push rods protruded from the crankcase in the front of the engine and actuated the inlet and exhaust valves in the cylinder head through rocker levers. Each cylinder has one large inlet valve and two smaller exhaust valves. The spring loaded inlet valve rod passed through the mixture transfer pipes at the back of the engine. The spiral spring-loaded rocker arm for the exhaust valves acts on a cross piece which connects with the valve rods to either side of each cylinder head. Exhaust pipes joined to the ports conveyed the products of combustion through the engine cowling.

The cylinders are steel forgings with integral heads and the cooling fins are coated with copper in an attempt to improve cooling. The pistons are of aluminium alloy. Two Claudel-Hobson H.C.8 carburettors and two Thompson Binnel Magnetos (Type AK9 Nos 418/420, made in Birmingham) are fitted. The magnetos fired two spark plugs mounted on the side of each cylinder. As in all radial engines, one of the connecting rods connects with the crankshaft in a conventional manner. This rod is designated the ?master rod' and other connecting rods articulate with it.

The engine operated on the four-stroke cycle where the air was first drawn through a carburettor then through a circular manifold to the engine cylinders. Ignition occurred in alternate cylinders during each engine revolution.

Specifications
Height: 1240 mm
Width: 1240 mm
Depth: 1215 mm
Cylinder diameter: 139.7 mm
Piston stroke: 165.1 mm
Weight: 299 kg
Compression ratio: 4.42:1


Engine plate details:
ABC Engine
Type: Dragonfly Mk II
No. 5000
Manufactured by Sheffield Simplex Motor Works
Tinsley, Sheffield, England

Previously L734

Marks

Nameplate:
ABC ENGINE
Type Dragon Fly Mk II 5000
Firing Order 135792468
Manufactured by
Sheffield Simplex Motor Works Ltd
Tinsley Sheffield England
Stamped
5000 A 60150 A D D37

Dimensions

Height

1300 mm

Depth

900 mm

Production

Made

1919

Source

Credit Line

Presented by the University of Sydney, 1983

Acquisition Date

16 August 1983

Cite this Object

Harvard

ABC Dragon Fly Mk II, 320 hp, 9-cylinder British WWI aero engine, 1919 2018, Museum of Applied Arts & Sciences, accessed 21 January 2019, <https://ma.as/213287>

Wikipedia

{{cite web |url=https://ma.as/213287 |title=ABC Dragon Fly Mk II, 320 hp, 9-cylinder British WWI aero engine, 1919 |author=Museum of Applied Arts & Sciences |access-date=21 January 2019 |publisher=Museum of Applied Arts & Sciences, Australia}}

Incomplete

This object record is currently incomplete. Other information may exist in a non-digital form. The Museum continues to update and add new research to collection records.

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