Model Variants (Including Prototypes)
A.W.23 - Armstrong Whitworth bomber/transport design on which the Whitley is based on.
Mk I - Initial Production Version; powered by two Armstrong Siddeley Tiger IX radials generating 920hp each; 34 examples produced.
Mk II - Fitted with Tiger VIII radial engines; 46 such produced.
Mk III - Fitted with Tiger VIII radials; fitted with retractable ventral gun position; 60 produced.
Mk IV - Powered by 2 x Rolls-Royce Merlin IV V-12 radial engines.
Mk IVA - Fitted with Merlin X engines generating 1,145hp; featured Nash and Thompson power-operated four gun rear tail turret negating the need for the earlier retractable ventral gun position; 40 examples produced.
Mk V - Main and Final Production Model; extended fuselage with straight leading wing edges; powered by Merlin X engines.