Rolls-Royce Archives
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From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Comparison of specifications for two car models, W.M.B. 11 and S.B.50.

Identifier  ExFiles\Box 111\3\  scan0148
Date  26th November 1940
  
Rm.{William Robotham - Chief Engineer}7/ML.26.11.40.

W.M.B. 11.            S.B.50.

Engine size        4¼ litres        4¼ litres
Engine Type        Aluminium Conventional    Cast Iron Novel
Wheel base        11 ft. 4 ins.        10 ft. 10 ins.
Weight            41½ cwt.        39 cwt.
Lap speed        76 m.p.h.        85 m.p.h.
Axle ratio        8 X 34            11 X 41
Consumption (Approx:)    15            16
Compression Ratio        6.5            6.25

Reduced Cost.
Improved Durability.
Greater Fuel Economy.
Improved Performance.
  
  


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