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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).
Letter discussing the mechanical causes of 'juddering' during deceleration.

Identifier  ExFiles\Box 27\3\  Scan069
Date  31th March 1939 guessed
  
In decelerating, I imagine, the possible points where jerking can arise are between the brake linings and the drum and, again, between the tyres and the ground. I do not see clearly how the clutch could be responsible for 'juddering' when decelerating โ€” or does the engine actually run faster than the wheels allow it, when the brakes are suddenly applied, and cause a jerky slipping movement in the clutch! โ€” I really do not know if this can happen in a car; but if it cannot, what is 'juddering' in the case of deceleration?

I hope you won't mind being troubled further about this word. I always like to find out the exact meaning; and while I have no doubt but that what you say in your letter is correct, I think other things are also called 'juddering'! If my imperfect knowledge of cars is leading me to see difficulties where there aren't any, I hope you will believe that I am not deliberately making stupid difficulties.

yours sincerely,
J.{Mr Johnson W.M.} M.{Mr Moon / Mr Moore} Wyllie
  
  


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