Close this search box.

Heston T.1/37

The Heston T.1/37 was a 1930s British single engine monoplane military trainer aircraft with two open cockpits.

It was not accepted for service and only one was built.

The Heston T.1/37 or Heston JA3 was designed under the leadership of George Cornwall to meet UK Air Ministry Specification T.1/37 for an ab initio trainer and was otherwise unnamed.

Its competitors were the Miles M.15 and the Parnall 382 (Heck III).

The Airspeed AS.36, General Aircraft GAL.32 and Percival P.20 were also proposed against specification T.1/37, but not accepted for being built as prototypes.

None of the designs was selected for production orders; it has been suggested that the required performance could not be achieved within the constraints of the Specification.

Construction was primarily wooden, with plywood-skinned spruce frames, open framed movable flying surfaces, some monocoque sections, all fabric-covered.

The cantilever oleo-pneumatic fixed main undercarriage legs were raked forward and faired with spats, and the tailwheel was also spatted.

The propeller was a de Havilland fixed-pitch type, later replaced by a two-speed type in 1939 when other modifications were made at Heston.

Student and tutor sat in open, tandem cockpits.





31 ft 8 in (9.65 m)


42 ft 0 in (12.80 m)


7 ft 10 in (2.39 m)

Wing area

227 sq ft (21.1 m2)

Aspect ratio



NACA 23012

Empty weight

2,748 lb (1,246 kg)

Gross weight

3,250 lb (1,474 kg)


1 × de Havilland Gipsy Queen,

6-cylinder inverted inline engine,

190 hp (140 kW)


Maximum speed

159 mph (256 km/h, 138 kn) at sea level

Service ceiling

12,800 ft (3,900 m)

Rate of climb

690 ft/min (3.5 m/s).






Share on facebook