Only two ST 10 and two retractable ST 11s were built. ST 11s featured the de Havilland Gipsy Major of 130hp.

The ST.11/33 never carried British registration and was sold in Australia as VH-VAZ.

In 1934 a move to Hanworth was made and the prototype ST 10, G ACTS, was built. The 90hp Pobjoy Niagara powered ST 10 was a much refined version with redesigned forward fuselage.

With H M Schofield at the controls and the designer as passenger, G ACTS won the King’s Cup of July 1934 at 134mph.

Only one other ST 10 and two retractable ST 11s were built.

A version of the ST.4 with retractable undercarriage, the ST 6, attracted little interest, including a single conversion from an ST 4 Mk II.

Only four were built.

Engine: 2 x Pobjoy
Undercarriage: retractable

The prototype General Aircraft Monospar ST 4 was G ABUZ.

The ST 4 went into series production by the newly formed General Aircraft Ltd at Croydon. This four seat aircraft was powered by two 85hp Pobjoy radials and introduced the characteristic ‘Monospar’ look. Seven ST 4 Mk Is and 22 improved Mk IIs were built. A version with retractable undercarriage, the ST 6, attracted little interest, including a single conversion from an ST 4 Mk II.

Ten S.T.4 Mk.II were sold abroad. On was sold in Japan to the Asahi Press Association in 1933, and delivered in the winter of 1933/34. Registered J-BBDA, the agent for the sale was the Aviation Department of Nosawa & Co,

A complete aircraft, three-seat enclosed cabin monoplane ST 3 G AARP utilising a single spar wing was built by Gloster at Brockworth for Stieger and made its first flight in 1931. With two Salmson radials developing 100hp between them the ST 3 had unusually high performance for its power and could be dived at 178 mph.

Engines: two 45 hp Salmson radial