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).
With diagrams on a governor-controlled fan and dynamo drive system.

Identifier  ExFiles\Box 173\1\  img305
Date  31th January 1934 guessed
  
XI
Have seen the latest drawing of the governor controlled fan speed. This is being worked at hard to provide a drive that also will not over speed the dynamo / many here are now belt driven!
In its latest form

The bottom pulley is spring loaded only and opens out to reduce drive ratio under the influence of the governor.
  
  


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