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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).
Necessity of ventilated or louvered bonnets for cars used at high speeds on the Continent.

Identifier  ExFiles\Box 29\3\  Scan207
Date  25th June 1930
  
Hs{Lord Ernest Hives - Chair}/Rml/MJ25.6.30 contd.

-8-

special motor roads, all encourage high speeds.

We know of no big car used on the Continent that does not fit ventilated bonnets.

Therefore, wil while we are better off for
cooling than we have been before, we think we shall still
have to equip cars habitually used on the Continent with
louvred bonnets. We shall also have to do all we know to
cope with the high speeds that can now be attained on
some English roads.

We are carrying out a further series of tests to
see how this can best be accomplished.

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


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