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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).
Request for performance data on a starter motor's armature, specifically its end pull characteristics.

Identifier  ExFiles\Box 64\2\  scan0003
Date  1st October 1926 guessed
  
-2- Contd.

(A) What is the end pull of the existing starter motor armature by teazer circuit magnetisation from one inch out to normal position, when the pull falls to nothing. We believe the curve for end pull is somewhat like this, and we should like you to give us the correct characteristic for this with the intermediate positions -

LBS PULL
DISTANCE OUT OF ARMATURE

We should further be glad if you would give us the pull in terms of ampere turns for various positions between one inch out and normal.

(B) What is the end pull of the armature by the main circuit field winding for positions say from half inch out to normal ?

We require this information as soon as you can possibly let us have it in order to determine the most efficient layout and spring loads, etc.

R.{Sir Henry Royce}
  
  


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