The Miles M28 was designed to fulfill two major functions, a two seater ab-initio/intermediate trainer and a three seat communications aircraft.
Construction of the prototype was suspended in 1939 but recommenced in 1941, the prototype flying on 11 July 1941. The prototype had an R.A.F. Service Number of U-0232.
It was designed to be powered by either a Cirrus Major 150 HP engine or a Gypsy Major IIA with fixed pitch propeller or a Gypsy Major III with a constant speed propeller. With Miles low drag flaps and drooping ailerons as well as a fuselage air brake, landing speeds were as low as 40 miles per hour.
Three prototypes were produced during the war: the Mk.1 two-seat dual-control trainer, the Mk.2 three-seater with hydraulic undercarriage retraction, and the Mk.3 triple-control trainer.
Three additional machines were produced after the war: one Mk.4 and two Mk.6.
M.28 Mercury Mk.1
two-seat dual-control trainer
M.28 Mercury Mk.2
three-seater
M.28 Mercury Mk.3
triple-control trainer
M.28 Mercury Mk.4
Engine: 145 hp Gipsy Major IIA
M.28 Mercury 6
Engine: 155 hp Blackburn Cirrus Major III
Wingspan: 30 ft 8 in
Length: 24 ft
Height: 8 ft 3 in
Empty weight: 1460 lb
Loaded weight: 2427 lb
Max speed: 157 mph
Cruise: 139 mph
ROC: 890 fpm
Range: 410 mi
Engine: Gypsy Major III
Top speed: 176 mph
Span: 30 ft 6 in
Length: 22 ft 1.5 in
Height: 8 ft 6 in
Wing area: 160 sq. ft
All Aero 