The de Havilland Gipsy is a British air-cooled four-cylinder
in-line aircraft engine designed by
Frank Halford
Major Frank Bernard Halford CBE FRAeS (7 March 1894 – 16 April 1955) was an English aircraft engine designer. He is best known for the series of de Havilland Gipsy engines, widely used by light aircraft in the 1920s and 30s.
Career
Educated ...
in 1927 to replace the
ADC Cirrus in the
de Havilland DH.60 Moth light biplane. Initially developed as an upright 5 litre (300 cubic inch)
capacity engine, later versions were designed to run inverted with increased capacity and power.
The Gipsy went on to become one of the most popular sport aircraft engines of the inter-war period and was the engine of choice for various other
light aircraft,
trainers,
liaison aircraft
A liaison aircraft (also called an army cooperation aircraft) is a small, usually unarmed aircraft primarily used by military forces for artillery observation or transporting commanders and messages. The concept developed before World War II and ...
and
air taxis, British as well as foreign, until long past World War II. Apart from helping to establish the
de Havilland Aircraft Company as a manufacturer of light aircraft, it also established the company as an engine manufacturer in its own right.
Gipsy engines remain in service powering vintage light aircraft.
Design and development
Just like the ADC Cirrus, the Gipsy was born as a collaboration between aircraft manufacturer
Geoffrey de Havilland and engine designer
Frank Halford
Major Frank Bernard Halford CBE FRAeS (7 March 1894 – 16 April 1955) was an English aircraft engine designer. He is best known for the series of de Havilland Gipsy engines, widely used by light aircraft in the 1920s and 30s.
Career
Educated ...
. In fact, the early history of the Cirrus and Gipsy were linked through de Havilland's D.H.60 Moth.
Cirrus origins
In 1925 Geoffrey de Havilland was looking for a reliable cheap engine for use in a light sports aircraft. More particularly, he was looking for something like his favourite First World War aircraft engine: the
Renault 8G air-cooled V8, but with half the weight and half the power. Halford gave it to him by building a four-cylinder crankcase and adding to it half of the Renault's cylinders, several other of the Renault's components, and standard parts used in car engines. The result was a in-line aircraft engine that, although it fell short of the promised horse-power, was still superior to all contemporary engines for light aircraft. Most importantly it was a true aircraft engine at a time where its competitors were more often than not motorcycle engines adapted to running at high altitude. The engine secured, de Havilland Aircraft commenced manufacture of the D.H.60 Moth and the combination of reliable powerplant – the
ADC Cirrus – and reliable training craft – the Moth – marked the start of serious sports flying in Britain.
By 1927 however, the Moth threatened to become a victim of its own success as continuing demand was depleting the stockpiles of surplus Renaults needed to build its Cirrus engine. The Moth now having provided a solid financial cushion, de Havilland Aircraft decided to take the problem head-on and start its own engine factory. Geoffrey de Havilland again went to his old friend Halford and this time asked him to design a completely new aircraft engine of weight and performance comparable to the latest version of the Cirrus, the
Cirrus Hermes.
DH.71 Tiger Moth racer
Halford and de Havilland quickly agreed on a test engine later to be de-rated to for production models. While Halford went to build the engine, de Havilland designed its test-bed: the diminutive
D.H.71 racer.
[Bransom 1991, p.25.] Two D.H.71s were built and although in a bout of over-confidence named Tiger Moth, their racing career was rather uneventful. Their only notable claim to fame came in capturing a world speed record of for their weight class. (The name Tiger Moth would later be used again for the D.H.82 trainer and with this aircraft gain more than its share of fame.) What the D.H.71 did not accomplish in racing successes, it did accomplish in developing the new engine and by the time the career of the D.H.71 was over, the production version of its engine, now named the Gipsy, was ready to start its career.
Technical description
Like the Cirrus, the new Gipsy was an air-cooled four-cylinder in-line engine weighing a mere 300 pounds and rated at 98 hp (73 kW) at 2,100 rpm. The cylinders had a
bore
Bore or Bores often refer to:
*Boredom
* Drill
Relating to holes
* Boring (manufacturing), a machining process that enlarges a hole
** Bore (engine), the diameter of a cylinder in a piston engine or a steam locomotive
** Bore (wind instruments), ...
of and a
stroke
A stroke is a medical condition in which poor blood flow to the brain causes cell death. There are two main types of stroke: ischemic, due to lack of blood flow, and hemorrhagic, due to bleeding. Both cause parts of the brain to stop functionin ...
of for a displacement of . It was soon developed further into the Gipsy II; both types were to be used in the
D.H.60G Gipsy Moth. The new engine proved itself to be docile, easy to maintain and, as demonstrated in many long distance flights by the new Gipsy Moth, reliable.
Birth of the Gipsy Major
For all of this the new engine still had one drawback: its cylinders were still built on top of the crankshaft and therefore were sticking out of the top of the fuselage, right in the pilot's field of vision. Lowering the engine was impossible as the crankshaft was directly connected to the propeller and the propeller could not be placed too low lest it would plough into the ground on hard landings or bumpy fields. The solution came as several pilots boasted that they would be able to fly their Moth upside down for as long as they wanted if it were not for the carburettor and fuel tank now being inverted. Halford decided to test this by mounting a Gipsy engine upside down and then inverting its
carburettor
A carburetor (also spelled carburettor) is a device used by an internal combustion engine to control and mix air and fuel entering the engine. The primary method of adding fuel to the intake air is through the venturi tube in the main meterin ...
so it was now right side up again. The design proved to run just as flawlessly as the regular Gipsy engine and soon the Gipsy I and II were replaced on the production lines by the Gipsy III inverted four-cylinder engine. The Moth with this new engine became the D.H.60 G-III; as the Gipsy III was quickly developed further into the
Gipsy Major, the D.H.60 G-III was baptised the Moth Major.
Building on the success of the D.H.60, de Havilland now started building other sports aircraft and trainers, all of which were powered by its own Gipsy engines. The company now produced Gipsy engines for other manufacturers as well and the Gipsy Major in particular became the engine of choice for scores of light aircraft designs, British as well as foreign. Most notably it was the engine of the famous World War II
D.H.82A Tiger Moth trainer.
Variants
;Gipsy I
:Original production version. 1,445 built.
[Lumsden 2003, p.71.]
;Gipsy II
:Stroke increased to 5.5 in (140 mm). Power 120 hp (90 kW) at 2,300 rpm. 309 built
[Lumsden 2003, p.71.]
;Gipsy III
:As Gipsy II, inverted. 611 built.
[Lumsden 2003, p.71.]
;Gipsy IV
:A smaller inverted four-cylinder in-line engine, derived from the Gipsy III, intended for light sporting aircraft. Forerunner of Gipsy Minor. Power 82 hp (61 kW).
;
Gipsy Major
:Further development of the Gipsy III. Originally 130 hp (92 kW) later 141 and 145 hp (105, 110 kW)
;
Gipsy Minor
:Further development of the Gipsy IV. Power 90 hp (67 kW).
;Gipsy R
:Racing engine for
de Havilland DH.71 Tiger Moth
The de Havilland DH.71 Tiger Moth was a British single-seat monoplane, designed to research high-speed flight and to test replacement engines for the Cirrus. Only two were built.
Design and development
It was a low-wing monoplane based on th ...
. 135 hp (100 kW) at 2,850 rpm.
;Wright-Gipsy L-320
:Licence production in the United States of the Gipsy I
Applications
Application list from Lumsden. Gipsy Minor and Major not included.
Gipsy I
*
Avro Avian
*
Bartel BM-4
*
Blackburn Bluebird IV
*
Breda Ba.15
The Breda Ba.15 was a two-seat light aircraft produced in Italy in 1928.
Design and development
It was a high-wing braced monoplane of conventional design that seated the pilot and passenger in tandem within a fully enclosed cabin. Ba.15s were f ...
*
de Havilland DH.60G Gipsy Moth
*
de Havilland DH.60T Gipsy Moth Trainer
*
de Havilland D.H.71 Tiger Moth racer
*
PZL.5
*
Simmonds Spartan
*
Southern Martlet
*
Spartan Arrow
*
Westland Widgeon
Gipsy II
*
Airspeed Ferry
The Airspeed AS.4 Ferry was three-engined ten-seat biplane airliner designed and built by the British aircraft manufacturer Airspeed Limited. It was the company's first powered aircraft to be produced.
It was proposed for development in April ...
*
Avro Avian
*
Blackburn Bluebird IV
*
de Havilland DH.60G Gipsy Moth
*
de Havilland DH.60T Gipsy Moth Trainer
*
PZL.5
*
RWD-4
The RWD 4 was a Polish sports plane of 1930, constructed by the RWD team.
Development
The RWD 4 was constructed by the RWD team of Stanisław Rogalski, Stanisław Wigura and Jerzy Drzewiecki in Warsaw. It was based upon their earlier RWD 2 ...
*
Saro Cutty Sark
*
Saro Windhover
The Saro A.21 Windhover was a British amphibious aircraft from the period between World War I and World War II, constructed by Saunders-Roe, or ''Saro''. It was originally advertised as the A.19 Thermopylae after the famous clipper ship, bein ...
*
Short Mussel
*
Simmonds Spartan
*
Southern Martlet
*
Spartan Arrow
*
Spartan Three Seater
Gipsy III
Gipsy IV
*
de Havilland Swallow Moth
Gipsy R
*
de Havilland DH.71 Tiger Moth racer
Survivors
As of October 2010 approximately 17 Gipsy-powered
de Havilland DH.60 Moths remain on the British register. Not all are currently airworthy.
Engines on display
Preserved de Havilland Gipsy engines are on public display at the:
*
de Havilland Aircraft Heritage Centre
*
Royal Air Force Museum Cosford
*
Shuttleworth Collection
*
Old Rhinebeck Aerodrome
Specifications (Gipsy I)
See also
References
Notes
Bibliography
* Bransom, Alan. ''The Tiger Moth Story, Fourth Edition''. Shrewsbury, UK: Airlife Publishing Ltd., 1991. .
* Lumsden, Alec. ''British Piston Engines and their Aircraft''. Marlborough, Wiltshire: Airlife Publishing, 2003. .
External links
de Havilland Gipsy at the Royal Air Force Museum
{{DHaeroengines
Gipsy
1920s aircraft piston engines