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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).
The approximate clutch horse-powers for the P.11. Continental, P.11. Standard, and 20/25 HP chassis.

Identifier  ExFiles\Box 27\2\  Scan021
Date  18th March 1933
  
(Showrooms).
To Sr. From Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}

V1775

Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}2/MJ.18.3.33.

With reference to your memo. SR22/MLG.16.3.33., the approximate horse-powers for the three chassis you mention are:-

160 P.11. Continental.
120 P.11. Standard.
78 20/25 HP.

The figures given are clutch horse-powers, running open exhaust.

It should be remembered that we are always improving the breed and therefore these horse-powers are constantly being increased.

Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}
  
  


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