The de Havilland DH.15 Gazelle was an engine testbed for the

Galloway Atlantic The Galloway Atlantic is a 500 hp V12 aircraft engine that was ordered into production toward the end of World War I. It was developed as a V12 configuration of the inline-six Galloway Adriatic, with two Adriatic cylinder banks mounted on a si ...

engine, converted from a de Havilland DH.9A for flight trials in 1919–20. Only one was built.

Development

The DH.15 Gazelle, more often known just as the DH.15, was a standard DH.9A, complete with original armament, converted for use as an engine testbed. The engine involved was the 500 hp (373 kW) Galloway Atlantic, a water-cooled V-12 unit produced by the Galloway Engineering Co., which merged two six-cylinder inline Galloway Adriatic engines onto a common crankcase. This replaced the DH.9A's standard 400 hp (300 kW)

Liberty 12 The Liberty L-12 is an American water-cooled 45° V-12 engine, displacing and making , designed for a high power-to-weight ratio and ease of mass production. It was designed principally as an aircraft engine and saw wide use in aero applicatio ...

, although without a great change in appearance, as the Atlantic was mounted behind a similar large rectangular radiator. Both engines were upright V-12s, both with crankshafts near the base, and in each case, the propeller was mounted low on the nose. The exhaust pipes on the DH.15 were longer than the usual DH.9A set, running straight back from the upper sides of the engine, ending at the observer's cockpit. Two DH.15s were ordered, but only one was built. It completed many flights with the Atlantic engine from 1919 to 1920.

Specifications

References

Citations

Bibliography

* * {{de Havilland aircraft 1910s British experimental aircraft DH.15 DH.015 Single-engined tractor aircraft Biplanes Aircraft first flown in 1919 Aircraft with fixed conventional landing gear