In order to better distinguish between the different standards of Rapides available in the post-war environment, de Havilland established a basic mark number system. Mk 1 aircraft were those constructed pre-war, while Mk 2 and Mk 3 Rapides were ex-military conversions to a six-passenger cabin and eight-passenger cabin respectively. Those Rapides that were re-engined with a pair of de Havilland Gipsy Queen engines, were referred to as Mk 4s. These had an improved climb, cruise speed and single engine performance, but an increased all-up weight of .