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,
All Aero 