General Aircraft Monospar ST-25

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General Aircraft Monospar ST-25 was a British light twin‑engined aircraft built in the 1930s. It was made by General Aircraft Ltd of Hanworth. Sixty were built between 1935 and 1939. The ST‑25 is a low‑wing monoplane with a metal frame covered in fabric. Its name "Monospar" comes from using a single wing spar, developed by H. J. Stieger. It was developed from the GAL Monospar ST‑10, adding a folding seat for a fifth passenger, extra side windows, and a radio receiver. The enclosed cabin seats five. The prototype G‑ADIV first flew on 19 June 1935 at Hanworth Air Park. It was also known as the ST‑25 Jubilee to honour the 25th anniversary of King George V's reign.