Although the Cirrus engine was reliable, its manufacture was not.
It depended on components salvaged from World War I–era 8-cylinder Renault engines and therefore its numbers were limited by the stockpiles of surplus Renaults.
De Havilland therefore decided to replace the Cirrus with a new engine built by his own factory.
In 1928 when the new de Havilland Gipsy I engine was available a company DH.60 Moth G-EBQH was re-engined as the prototype of the DH.60G Gipsy Moth.

Next to the increase in power, the main advantage of this update was that the Gipsy was a completely new engine available in as great a number as the manufacture of Moths necessitated.
 The new Gipsy engines could simply be built in-house on a production-line side by side with the Moth airframes.
This also enabled de Havilland to control the complete process of building a Moth airframe, engine and all, streamline productivity and in the end lower manufacturing costs.
While the original DH.60 was offered for a relatively modest £650, by 1930 the price of a new Gipsy-powered Moth was still £650, this in spite of its state-of-the-art engine.

A metal-fuselage version of the Gipsy Moth was designated the DH.60M Moth and was originally developed for overseas customers, particularly Canada.
The DH.60M was also licence-built in Australia, Canada, the United States and Norway.
Also in 1931 a variant of the DH.60M was marketed for military training as the DH.60T Moth Trainer.

In 1931 with the upgrade of the Gipsy engine as the Gipsy II, de Havilland inverted the engine and re-designated it the Gipsy III.
The engine was fitted into a Moth aircraft, which was re-designated the DH.60G-III Moth Major.
This sub-type was intended for the military trainer market and some of the first aircraft were supplied to the Swedish Air Force.

The DH.60T Moth was re-engined with the Gipsy III and was initially re-designated the DH.60T Tiger Moth.
The DH.60T Tiger Moth was further modified with swept back mainplanes and the cabane struts were moved forward to improve egress from the front cockpit in case of emergency.
The changes were great enough that the aircraft was again re-designated, becoming the DH.82 Tiger Moth.
Although the Cirrus engine was reliable, its manufacture was not. It depended on components salvaged from World War I–era 8-cylinder Renault engines and therefore its numbers were limited by the stockpiles of surplus Renaults. De Havilland therefore decided to replace the Cirrus with a new engine built by his own factory. In 1928 when the new de Havilland Gipsy I engine was available a company DH.60 Moth G-EBQH was re-engined as the prototype of the DH.60G Gipsy Moth.
Next to the increase in power, the main advantage of this update was that the Gipsy was a completely new engine available in as great a number as the manufacture of Moths necessitated.  The new Gipsy engines could simply be built in-house on a production-line side by side with the Moth airframes. This also enabled de Havilland to control the complete process of building a Moth airframe, engine and all, streamline productivity and in the end lower manufacturing costs. While the original DH.60 was offered for a relatively modest £650, by 1930 the price of a new Gipsy-powered Moth was still £650, this in spite of its state-of-the-art engine.
A metal-fuselage version of the Gipsy Moth was designated the DH.60M Moth and was originally developed for overseas customers, particularly Canada. The DH.60M was also licence-built in Australia, Canada, the United States and Norway. Also in 1931 a variant of the DH.60M was marketed for military training as the DH.60T Moth Trainer.
In 1931 with the upgrade of the Gipsy engine as the Gipsy II, de Havilland inverted the engine and re-designated it the Gipsy III. The engine was fitted into a Moth aircraft, which was re-designated the DH.60G-III Moth Major. This sub-type was intended for the military trainer market and some of the first aircraft were supplied to the Swedish Air Force.
The DH.60T Moth was re-engined with the Gipsy III and was initially re-designated the DH.60T Tiger Moth. The DH.60T Tiger Moth was further modified with swept back mainplanes and the cabane struts were moved forward to improve egress from the front cockpit in case of emergency. The changes were great enough that the aircraft was again re-designated, becoming the DH.82 Tiger Moth.
De Havilland DH.60 Moth