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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).
Blueprint detailing the test procedure for measuring servo efficiency and comparison using spring balances.

Identifier  ExFiles\Box 5\3\  03-page173
Date  25th August 1931
  
BASIS OF SERVO COMPARISON
LBS READING OF Y
LBS READING OF X
AVERAGE OF ALL READINGS SHOULD LIE BETWEEN THE LIMITS GIVEN BELOW
THIS BALANCE SHOULD NOT FOUL SERVO LEVERS WHEN BRAKES FULL ON
INDIA SERVO EFFICIENCY
DIAGRAM "SHEWING" POSITIONS OF SPRING BALANCES WHEN INSERTED FOR MEASURING SERVO EFFICIENCY.
THE RODS SUPPORTING THE BALANCES A & B AND C & D SHOULD BE THE SAME LENGTH AS THOSE NORMALLY ON THE CAR.
ALL THE LEVERS SHOULD WORK THROUGH THEIR NORMAL ANGLES WHEN THE TEST IS BEING MADE.
THE FOLLOWING POINTS SHOULD BE NOTED WHILE CONDUCTING THE TEST
a) THE SERVO SHOULD NOT BE ALLOWED TO GET HOT
b) THE BRAKES SHOULD NOT BE APPLIED SUFFICIENTLY VIOLENTLY TO LOCK THE REAR WHEELS
c) THE BRAKES SHOULD NOT BE APPLIED SUFFICIENTLY VIOLENTLY TO CAUSE THE SERVO TO COME UP AGAINST ITS STOP
d) AN AVERAGE OF A DOZEN TESTS SHOULD BE TAKEN AT VARIOUS SPEEDS AND WITH VARYING PEDAL PRESSURES
e) LIMITS OF AVERAGE EFFcy Y/X ARE
MAXIMUM: .75
MINIMUM: .5
Stamp Text: ROLLS-ROYCE LTD, TEST R.{Sir Henry Royce} DEPT, 25 AUG 1931, RECEIVED
  
  


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