Built as a three-seat version of the Simmonds Spartan, the Three Seater was a biplane with a spruce and plywood fuselage.

The wings were designed to fold back easily, in order to be stored in a shed rather than requiring a dedicated hangar.

The six Three Seater IIs had improved visibility for the pilot and easier access for the passengers, and were powered by a 130 horsepower (97 kW) Cirrus Hermes IV engine.

One Three Seater II (registered as ZK-ARH) currently survives, owned by a private individual in New Zealand, having passed through British and Irish owners (as G-ABYN and EI-ABU) since its manufacture in June 1932.

The aircraft was mainly operated by flying clubs and private individuals: General characteristics Performance