Avro 691 Lancastrian

Specifications

1st Flight 1943

Crew: 4 + 1 cabin crew

Capacity: 9

Length: 76 ft 10 in (23.42 m)

Wingspan: 102 ft (31 m)

Height: 17 ft 10 in (5.44 m)

Wing area: 1,297 sq ft (120.5 m2)

Aspect ratio: 8.02

Airfoil: root: NACA 23018; tip: NACA 23012

Empty weight: 37,190 lb (16,869 kg) equipped

Gross weight: 65,000 lb (29,484 kg)

Maximum landing weight: 58,000 lb (26,308 kg)

Fuel capacity: 2,154 imp gal (2,587 US gal; 9,792 l) in wing tanks, with 1,020 imp gal (1,225 US gal; 4,637 l) in bomb-bay tanks

Powerplant: 4 × Rolls-Royce Merlin 24/2 V-12 liquid-cooled piston engines, 1,620 hp (1,210 kW) each

Propellers: 3-bladed de Havilland Hydromatic, 13 ft (4.0 m) diameter constant-speed fully-feathering propellers

Performance

Maximum speed: 315 mph (507 km/h, 274 kn) at 58,000 lb (26,308 kg) and 12,000 ft (3,658 m)

285 mph (248 kn; 459 km/h) at sea level

300 mph (261 kn; 483 km/h) at 3,500 ft (1,067 m)

Cruise speed: 290 mph (470 km/h, 250 kn) maximum weak mixture at 17,500 ft (5,334 m)

280 mph (243 kn; 451 km/h) at 11,000 ft (3,353 m)

245 mph (213 kn; 394 km/h) at sea level

Range: 4,100 mi (6,600 km, 3,600 nmi) at 230 mph (200 kn; 370 km/h) and 20,000 ft (6,096 m) with 2,190 lb (993 kg) payload

3,280 mi (2,850 nmi; 5,279 km) at 280 mph (243 kn; 451 km/h) and 20,000 ft (6,096 m) with 4,340 lb (1,969 kg) payload

3,600 mi (3,128 nmi; 5,794 km) at 280 mph (243 kn; 451 km/h) and 20,000 ft (6,096 m) with 2,190 lb (993 kg) payload (maximum weak mixture)

3,200 mi (2,781 nmi; 5,150 km) at 280 mph (243 kn; 451 km/h) and 20,000 ft (6,096 m) with 4,850 lb (2,200 kg) payload (maximum weak mixture)

Service ceiling: 24,300 ft (7,400 m)

19,000 ft (5,791 m) on three engines

Absolute ceiling: 25,000 ft (7,620 m) at maximum continuous power

20,500 ft (6,248 m) on three engines

Rate of climb: 970 ft/min (4.9 m/s) at 65,000 lb (29,484 kg) and 10,000 ft (3,048 m)

950 ft/min (4.8 m/s) at sea level

Maximum rate of climb on three engines: 490 ft/min (2.5 m/s) at sea level

250 ft/min (1.3 m/s) at 15,000 ft (4,572 m)

Wing loading: 50 lb/sq ft (240 kg/m2)

Power/mass: 0.1 hp/lb (0.16 kW/kg)

Take-off distance to 50 ft (15 m): 3,600 ft (1,097 m)

Landing run: 1,650 ft (503 m)

Avro

Variants

The Avro 691 Lancastrian was a Canadian and British passenger and mail transport aircraft of the 1940s and 1950s developed from the Avro Lancaster heavy bomber. 

The Lancastrian was basically a modified Lancaster bomber without armour or armament and with the gun turrets replaced by streamlined metal fairings, including a new nose section.

Lancastrian C.1 – Nine-seat transport aircraft for BOAC and Qantas.

Royal Air Force designation Lancastrian C.1 to Specification 16/44.

A total of 23 built by Avro

Lancastrian C.2 – Nine-seat military transport aircraft for the RAF.

A total of 33 built by Avro

Lancastrian 3 – 13-seat transport aircraft for British South American Airways.

A total of 18 built by Avro

Lancastrian C.4 – Ten to 13-seat military transport aircraft for the RAF.

Eight built by Avro

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