The possibility that the RAF would run short of fighters during the Battle of Britain prompted adaptation of the 750hp Rolls-Royce Kestrel 30-engined M.9 tandem two-seat advanced trainer as an emergency single-seat . The rear seat was removed, together with part of the rear cockpit glazing, a gunsight was installed and six 7.7mm machine guns were mounted in the wings. Assigned the designation M.24 retrospectively, a total of 23 fighter conversions was produced, but, in the event, no need arose for their operational use.
| Take-off weight||2563 kg||5650 lb|
| Empty weight||2142 kg||4722 lb|
| Wingspan||11.89 m||39 ft 0 in|
| Length||9.27 m||30 ft 5 in|
| Height||3.05 m||10 ft 0 in|
| Wing area||30.19 m2||324.96 sq ft|
| Max. speed||369 km/h||229 mph|
According to the Book of Miles Aircraft, Harleyford, the top speed was circa 300 mph,which accords with the weight and cockpit changes
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