Rolls-Royce Archives
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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 performance characteristics of a hydraulic steering damper, including oil viscosity and pressure/flow analysis.

Identifier  ExFiles\Box 17\3\  Scan118
Date  28th January 1927
  
HYDRAULIC STEERING DAMPER

Top Graph:
OIL TEMP F DEGREES
REDWOOD VISCOSITY IN SECONDS.
THIN MINERAL COMPRESSOR OIL
VISCOSITY 90°F 250 SECS.
VISCOSITY 40°F 1600 SECS.
RESISTANCE SET UP BY A GIVEN LEAK FOR A GIVEN FLOW WILL THEREFORE BE ABOUT SIX TIMES AS GREAT AT 40°F AS AT 90°F.{Mr Friese} EXTREME WORKING CONDITIONS THEREFORE IF ARRANGED FOR NORMAL TEMPS. THE LEAK IS LIKELY TO MAKE THE DAMPER INEFFECTIVE IN HOT WEATHER.

Bottom Diagram & Graph:
VARIABLE LEAK
BACK PRESSURE ON PISTON LBS/D
OIL FLOW THROUGH LEAK. PTS/MIN.
FLOW OCCASIONED BY JOGGLE
.055 DIA LEAK
.046 DIA LEAK
.039 DIA LEAK
OIL TEMP 65F
A.{Mr Adams} PR.{Percy H. Rose} GIVING 60 LBS LOAD CROSS STEERING TUBE RADIUS.
B. PR.{Percy H. Rose} GIVING 50 LBS LOAD CROSS STEERING TUBE RADIUS.

Stamp Text:
RECEIVED
28 JAN 1927
DERBY
  
  


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