Major Philip Johnson, the unofficial head of Central Tank Corps Workshops in France, as soon as he received them began fitting one of the Whippets with leaf springs.
Later, in 1918, he fitted this vehicle with sprung track rollers, Walter Gordon Wilson's epicyclical transmission from the Mark V and a 360 hp V12 Rolls-Royce Eagle aero-engine.
A top speed of about 30 mph (48 km/h) was reached.
This project made Johnson the best qualified man to develop the later fast Medium Mark D, which looks like a reversed Medium A. Other experiments included the fitting of a large trailing wheel taken from an old Mark I tank and attaching a climbing tail, in both cases attempts to increase trench-crossing ability.

For a time it was assumed that after the war some Whippets were rebuilt as armoured recovery vehicles, but this was not the case.

The Medium Mark B, a completely different design by Wilson, also had the name "Whippet".
For a time it was common to describe any of the lighter tank designs as a Whippet, even the French Renault FT.
It had become a generic name.

The German Leichter Kampfwagen — developed from December 1917 — being also a turret-less tank with the engine in front resembled the Whippet, but was a smaller vehicle with thinner armour.
Major Philip Johnson, the unofficial head of Central Tank Corps Workshops in France, as soon as he received them began fitting one of the Whippets with leaf springs. Later, in 1918, he fitted this vehicle with sprung track rollers, Walter Gordon Wilson's epicyclical transmission from the Mark V and a 360 hp V12 Rolls-Royce Eagle aero-engine. A top speed of about 30 mph (48 km/h) was reached. This project made Johnson the best qualified man to develop the later fast Medium Mark D, which looks like a reversed Medium A. Other experiments included the fitting of a large trailing wheel taken from an old Mark I tank and attaching a climbing tail, in both cases attempts to increase trench-crossing ability.
For a time it was assumed that after the war some Whippets were rebuilt as armoured recovery vehicles, but this was not the case.
The Medium Mark B, a completely different design by Wilson, also had the name "Whippet". For a time it was common to describe any of the lighter tank designs as a Whippet, even the French Renault FT. It had become a generic name.
The German Leichter Kampfwagen — developed from December 1917 — being also a turret-less tank with the engine in front resembled the Whippet, but was a smaller vehicle with thinner armour.
Medium Mark A Whippet