General Aircraft Monospar ST-25
General Aircraft Limited · United Kingdom · first flew 1935 · light aircraft
The General Aircraft Monospar ST-25 was a British light twin-engined utility aircraft of the 1930s. It was a low-wing cantilever monoplane with a fabric-covered metal structure.
Recognition (WEFT)
| W — Wings | Low-mounted, straight |
|---|---|
| E — Engines | 2 × piston, wing-mounted |
| F — Fuselage | 8.03 m fuselage |
| T — Tail | Conventional |
WEFT is AircraftIQ's four-point recognition method — how it works.
Spot it by:
- Low cantilever monoplane wing with a single-spar structure
- Two radial engines mounted on the wing
- Enclosed five-seat cabin
A twin-engined low-wing monoplane with a single fin and rudder on the Jubilee and twin fins and rudders on the Universal.
Specifications
- The General Aircraft Monospar ST-25 has a length of 8.03 m (26 ft).
- It has a wingspan of 12.24 m (40 ft).
- Its maximum speed is 229 km/h (142 mph).
- Typical crew: 1.
Figures are for the representative variant described above; marks differ. See how AircraftIQ sources figures.
History
The name came from the single-spar wing structure developed by H J Stieger. The ST-25 was based on the GAL Monospar ST-10 with a folding fifth seat, extra side windows and a radio receiver. The prototype, G-ADIV, first flew at Hanworth Air Park on 19 June 1935 and was named Jubilee to honour the 25th anniversary of the reign of King George V.
Variants
The ST-25 Jubilee had a single fin and rudder and 30 were built. The ST-25 Universal had twin fins and rudders, and 29 were built; the Ambulance and Freighter versions had large doors. The GAL.41 was an experimental aircraft based on the Universal to test pressurisation systems.
Where you'll see it
Operators included Crilly Airways, Utility Airways, Eastern Canada Air Lines, the Royal Air Force and the Royal New Zealand Air Force. The last surviving ST-25, an ambulance, was restored between 1989 and 1999 and is displayed at Egeskov Castle in Denmark.
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