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).
Two graphs illustrating acceleration performance data for a 20 HP engine with different compression ratios and cut-out configurations.

Identifier  ExFiles\Box 178\1\  img212
Date  19th November 1926 guessed
  
Top Graph:
ACCELERATION
ACCELERATION FT/SEC/SEC.
ROAD SPEED M.P.H.
Legend:
HIGH COMP. 20 H.P.
HIGH COMP. 20 H.P. CUT OUT OPEN
STANDARD 20 H.P.

Bottom Graph:
ACCELERATION
HIGH V LOW COMPRESSION RATIO
20 H.P.
VELOCITY M.P.H.
TIME SECONDS
Legend:
HIGH COMP. 20 H.P. 5-4
HIGH COMP: 20 H.P. CUT OUT OPEN
STANDARD 20 H.P. 4-6
  
  


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