These two specifications brought out prototypes from several makers: the Blackburn Beagle, Handley Page Hare, Hawker Harrier, Vickers Vildebeest and Westland Witch.

Later in the year this engine was replaced by a geared 460 hp (345 kW) Bristol Jupiter VIII and flew in both land- and seaplane configurations.

[1] At RAF Martlesham Heath in 1928 the Goring powered by the Jupiter VIII competed with the Hare, Harrier and Witch over the 23/25 specification.

In the event none of them satisfied the Air Ministry, probably because they had anticipated higher performing aircraft powered by the supercharged Jupiter VII and X variants which had been unavailable owing to development difficulties.

Later it returned as a landplane to test the now airworthy Jupiter XF, at the same time having its fin area reduced by a narrower, straight edged surface.