Vanguard limiting speeds

[brakedwell]

As a comparison the Britannia performance figures are interesting.

General characteristics

• Crew: 4–7
• Capacity: 139 passengers (coach class)[84]
• Length: 124 ft 3 in (37.87 m)
• Wingspan: 142 ft 3 in (43.36 m)
• Height: 37 ft 6 in (11.43 m)
• Wing area: 2,075 sq ft (192.8 m2)
• Airfoil: root: NACA 25017; tip: NACA 4413[85]
• Empty weight: 86,400 lb (39,190 kg) [84]
• Max takeoff weight: 185,000 lb (83,915 kg)
• Powerplant: 4 × Bristol Proteus 765 turboprop engines, 4,450 shp (3,320 kW) each equivalent
• Propellers: 4-bladed

Performance

• Maximum speed: 397 mph (639 km/h, 345 kn) [86]
• Cruise speed: 357 mph (575 km/h, 310 kn) at 22,000 ft (6,706 m)
• Range: 4,430 mi (7,130 km, 3,850 nmi)
• Service ceiling: 24,000 ft (7,300 m) [87]

Specifications (Type 952)

Data from Vickers Aircraft since 1908[33]

General characteristics

• Crew: 3
• Capacity: 139 passengers
• Length: 122 ft 10+1⁄2 in (37.452 m)
• Wingspan: 118 ft 0 in (35.97 m)
• Height: 34 ft 11 in (10.64 m)
• Wing area: 1,527 sq ft (141.9 m2)
• Empty weight: 85,000 lb (38,555 kg)
• Gross weight: 141,000 lb (63,957 kg)
• Powerplant: 4 × Rolls-Royce Tyne RTy.11 Mk 512 turboprops, 5,545 shp (4,135 kW) each (eshp)

Performance

• Cruise speed: 422 mph (679 km/h, 367 kn) at 15,000 ft (4,600 m) (high speed cruise)[34]
• Range: 1,830 mi (2,950 km, 1,590 nmi) with maximum payload