Armstrong Whitworth Albemarle
The original bomber design required a crew of six including two gunners; one in a four-gun dorsal turret and one in a twin-gun ventral turret. However, only the first 32 aircraft, the Mk I Series I, were produced in this configuration, and they were only used operationally in the bomber role on two occasions.[5] That was because the Albemarle was considered inferior to other aircraft already in service, such as the Vickers Wellington.[6] All subsequent aircraft were built as transports, designated either "General Transport" (GT) or "Special Transport" (ST).
When used as a paratroop transport, 10 fully armed troops could be carried. The paratroopers were provided with a dropping hatch in the rear fuselage, and a large loading door in the fuselage side.[7]
The pinnacle of the aircraft's career was a series of operations for D-Day on 5 June 1944. 295 and 296 Squadrons sent aircraft to Normandy with the pathfinder force, and 295 Squadron claimed to be the first squadron to drop Allied troops during Operation Overlord.
Over the course of its production life, a number of variants of the Albemarle were built:
ST Mk I - 99 aircraft
GT Mk I - 69
ST Mk II - 99
Mk III - One prototype only.
Mk IV - One prototype only.
ST Mk V - 49
ST Mk VI - 133
GT Mk VI - 117
Most Marks were divided into "Series" to distinguish differences in equipment. The ST Mk I Series 1 (eight aircraft) had the four gun turret replaced with hand operated twin-guns under a sliding hood. As a special transport, a loading door was fitted on the starboard side; the rear fuel tank was removed.[4] The 14 ST Mk I Series 2 aircraft were equipped with gear for towing gliders. The Mk II could carry 10 paratroops and the Mk V was essentially the same but with a fuel jettison capability. All production Albemarles were powered by a pair of 1,590 hp (1,186 kW) Bristol Hercules XI radial engines.

General characteristics
Crew: 4
Capacity: 10 paratroopers in ST
Payload: 4,000 lb freight (1,820 kg)
Length: 59 ft 11 in (18.26 m)
Wingspan: 77 ft 0 in (23.47 m)
Height: 15 ft 7 in (4.75 m)
Wing area: 804 ft² (74.6 m²)
Empty weight: 25,347 lb (10,270 kg)
Loaded weight: 36,500 lb (16,556 kg)
Max. takeoff weight: 36,500 lb (16,590 kg)
Powerplant: 2 × Bristol Hercules XI radial engine, 1,590 hp (1,190 kW) each
Propellers: De Havilland hydromatic[3] propeller
Performance
Maximum speed: 230 kn (265 mph, 426 km/h) at 10,500 ft (3,200 m)
Cruise speed: 148 kn (170 mph, 274 km/h)
Stall speed: 61 kn (70 mph,[13] 113 km/h)
Range: 1,300 mi (2,092 km)
Service ceiling: 18,000 ft (5,486 m)
Rate of climb: 980 ft/min (5.0 m/s)