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Transport-Air > Aero-engines

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+ B1076 Aero engine, "Allison", type V1710...
+ B1076-1 Aero engine, "Allison", type V17...
+ B1091 Aero engine, Armstrong - Siddeley ...
+ B1092 Aero engine, Bristol "Hercules" XV...
+ B1093 Wright - Cyclone Aero-engine S/No ...
+ B1138 Aero engine, sectioned, gas turbin...
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+ B1192 (1) 1 only miniature model compres...
+ B1193 1 only aeroplane petrol engine, ai...
+ B1194 1 only air cooled aeroplane petrol...
+ B1478 Aircraft engine, twin cylinder, me...
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+ B1605 Aircraft Engine, Benz, 6 cylinder,...
+ B1606 Aero engine, 'Bristol Lucifer', fu...
+ B1619 Aero engine model, 'Le Rhone', wor...
+ B1620 Aero engine model, 'Clerget', work...
+ B2541 Aero engine, RAF 1a aero engine, V...
+ B2542 Aero engine, Wolseley W.4A Viper, ...
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+ B2545 Aero engine, Galloway Atlantic, Th...
+ B2546 Aero engine, Koerting (K├Ârting) V...
+ B2547 Aero engine, Siddeley Puma aero en...
+ B2548 Aero engine, Fiat type A12 aero en...
+ B2549 Aero engine, full size, Mercedes-D...
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+ B2551 Aero engine, Beardmore 160hp, Bear...
+ B2552 Aero engine, full size, Thulin rot...
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+ B2554 Aero engine, Clerget radial aero e...
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+ B2556 Aero engine, Sunbeam Nubian V8 aer...
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+ B2592 Aero engine, Scott "Flying Squirre...
+ B2594 Aero engine model, Clerget 9B, one...
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+ B1701 Aero engine, full size, "Harkness ...
+ B1940 Aero engine, Rolls-Royce, 'Derwent...
+ B2245 Model aero engine, three cylinder ...


Transport-Air > Horizontal engines

+ B888 Model of twin cylinder horizontal s...
+ B889 Model undertype steam engine, with ...
+ B922 Model steam engine, single cylinder...
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+ B935 Model, single cylinder horizontal s...
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+ B938 Model steam engine, twin cylinder, ...
+ B941 1 Horizontal factory engine, 14" fl...
+ B952 Model steam engine, single cylinder...
+ B1098 Engine model, steam, horizontal, b...
+ B1101 Hot air engine, metal / paint, des...
+ B1105 Engine model, single cylinder hori...
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+ B1122 Engine model, steam, single cylind...
+ B1123 Engine model, miniature, steam, si...
+ B1151 Model, twin cylinder horizontal st...
+ B1153 Engine model, horizontal, steam, s...
+ B1159 Engine model, horizontal, & dynamo...
+ B1160 Model, twin cylinder horizontal st...
+ B1190 (1) 1 only working model of horizo...
+ B1211 Model, single cylinder horizontal ...
+ B1212 Engine model, horizontal, steam, s...
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+ B1441 Model stationary steam engine and ...
+ B1525 Engine model, horizontal, & compre...
+ B1529 Engine model, horizontal, steam, s...
+ B1533 Engine model, winch; miniature mod...
+ B1541 Model engine [horizontal single cy...
+ B1560 Steam engine, horizontal oscillati...
+ B1566 Engine, steam, horizontal, single ...
+ H9992 Oil engine, horizontal single cyli...
+ H10238 Gas/petrol engine, horizontal, si...
+ B638 Engine horizontal, model, twin cyli...
+ B653 Model, horizontal-steam engine, tan...
+ B665 Model, undertype engine, with twin ...
+ B688 Gas engine, horizontal single cylin...
+ B795 Model twin cylinder, Tangye, horizo...
+ B796 Working model of horizontal factory...
+ B797 Working model horizontal factory en...
+ B798 Model single cylinder horizontal st...
+ B800 Working model of horizontal factory...
+ B807 Working model of horizontal Marine ...
+ B811 Model marine engine, twin cylinder ...
+ B813 Engine, gas, single cylinder, horiz...
+ B826 Model, steam engine, horizontal, si...
+ B831 Model paddle engine, twin cylinder,...
+ B1728 Working model of a single cylinder...
+ B1866 Eight H.P. Oil Engine, S.C. statio...



B1460 Aircraft engine, Armstrong Siddeley "Ounce", metal, Armstrong Siddeley Motors Limited, Coventry, England, c. 1920
This image is not currently available as a higher resolution full colour zoom. This may be because this object has not been moved from storage and re-photographed in recent times.

Object statement
Aircraft engine, Armstrong Siddeley "Ounce", metal, Armstrong Siddeley Motors Limited, Coventry, England, c. 1920
Immediately post-World War 1 several of the English aircraft manufacturers began to design small aircraft with a view to developing a leisure market in consideration of the number of trained pilots returning from the war. These aircraft were to be economical with engines around 40-50 horse power. Several aircraft engine manufacturers began or had been producing low powered engines that would suit these airframes. By way of a few examples, ABC of Walton-on-Thames produced a horizontally opposed twin cylinder engine of 40 horse power they christened "Gnat", British Anzani of Kingston-on-Thames produced a 45hp six cylinder radial, Green Engine Co. Ltd. of London had been producing 4 cylinder in line engines of 35-60hp from about 1909 and Armstrong Siddeley Motors Ltd of Coventry entered this market near the end of 1919 with a horizontally opposed twin cylinder engine using cylinders from their Jaguar 1 radial. This engine they called "Ounce". According to one author the "Ounce" was originally a cylinder test rig that "...did so well the Air Ministry ordered a small production run...". One thing seems certain; the production run was small. Only two aircraft types in Great Britain seem to have used the "Ounce", the Bristol Babe and the R.A.E. Aerial Target. While the evidence indicates that the Babe did not fly using the "Ounce" fitted to the 1919 Paris Show display aircraft the case of the R.A.E. Aerial Target suggests that possibly ten aircraft were fitted with the "Ounce" engine. It is supportive of the notion of the "small" production run that the Museum's "Ounce" appears to be the only survivor.

The information regarding the import of the engine into Australia is unknown. It seems that it was not in Australia for the Low-powered Aeroplane Competition held at Richmond Aerodrome from November 29th to December 8th, 1924. The imported engines used were 2 geared Anzanis, 1 ABC Scorpion and 3 Blackburne Tomtits; all imported from England. However, an advertisement appearing in the Australian magazine "Aircraft" for February 1939 lists a "little used" 45hp twin cylinder Armstrong Siddeley aero engine for sale by D. Power of Margaret Street, Toowoomba in Queensland. In December 1941 in the magazine The Air-Log a letter from Ronald Clarence Blanch, a dairy farmer of Woodford Leigh on the Clarence River in northern New South Wales, details his construction of a Clancy Skybaby aircraft using "...a 60hp horizontally opposed twin Armstrong Siddeley engine...", undoubtedly an "Ounce". Apparently this aircraft was dismantled some time in the immediate post war period. Considering the rarity of the "Ounce" it is probable that this is the Museum's engine. It is supposed that, Blanch bought the engine from Power. After the dismantling of the Skybaby the engine was sold and found its way to Sydney and the owner later donated the engine to the Museum.

Sources:
The Aeroplane, December 17-December 24, 1919
Meggs, Keith, Australian-built Aircraft and the Industry , Vol.1, Bk2, (Finger Four Publishing, Seymour, Victoria, 2009), p.396ff
Lumsden, Alec, British Piston Aero-Engines And Their Aircraft, (Airlife, Shrewsbury, England, 1994), p.66
Gunston, Bill, World Encyclopaedia of Aero Engines, (Patrick Stephens, Wellingborough, England, 1986), p.17
Allen, D.W., Pilotless Pioneers, Aeroplane Monthly, July, 1988, pp. 440-445


Ian Debenham
Curator, Transport
2009

 This text content licensed under CC BY-NC.

Description
Aircraft engine, Armstrong Siddeley "Ounce", metal, Armstrong Siddeley Motors Limited, Coventry, England, c. 1920

Twin cylinder horizontally opposed engine with single magneto. Serial No. 26332.
Made: 1915 - 1925
B1460
Production date
1915 - 1925
Height
800 mm
Width
1003 mm
Depth
521 mm
Weight
61.4 kg

 This text content licensed under CC BY-SA.
Acquisition credit line
Gift of Watkins, D, 1961

This object record is currently incomplete. The information available may date back as far as 125 years. 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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{{cite web |url=http://from.ph/207806 |title=B1460 Aircraft engine, Armstrong Siddeley "Ounce", metal, Armstrong Siddeley Motors Limited, Coventry, England, c. 1920 |author=Powerhouse Museum |accessdate=31 July 2015 |publisher=Powerhouse Museum, Australia}}


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