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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).
Servo squeaking and a proposal to test a Phantom front axle on an S.S. model to improve steering.

Identifier  ExFiles\Box 24\5\  Scan180
Date  1st June 1929 guessed
  
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woven cotton. We find, as you know, that when we completely set the cotton lining with oil the efficiency drops tremendously. We should like you to see whether you can stop the servo squeaking when reducing the efficiency by judicious application of paraffin or a mixture of paraffin and oil.

(3) Front axle.

We have confirmed on 20-EX the results that we got on 22-EX. Briefly the results are that if we fit a Phantom front axle to the S.S. we at once vastly improve the S.S. steering. The great advantage of this is that we can then use a more flexible engine mounting. Previously the S.S. steering was so bad that we were obliged to hold the engine rigidly in the frame to prevent radiator jellying. We are therefore proposing to go back to the Phantom front axle on the SS{S. Smith}, but before we do so we should like to have confirmation of our results from you. Therefore, will you please arrange to get an all round impression of 21-EX steering in its present form after you have obtained what you consider to be the best compromise with the side steering tube and cross steering tube and then take the car to Sevres and get the front axle changed. You can probably arrange with Ps. to put the car in an out-of-the-way corner in the Shop and throw a sheet over it, and he could probably arrange that the Watchman prevents anyone from examining it.

We consider this axle test to be of vital importance because we have got to stop
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