Blueprint detailing the performance characteristics of a hydraulic steering damper, with graphs for oil viscosity and pressure versus flow.
| Identifier | ExFiles\Box 68\1\ scan0093 | |
| 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/SQ IN. OIL FLOW THROUGH LEAK. PTS/MIN. FLOW OCCASIONED BY JOGGLE .039 DIA. LEAK .046 DIA. LEAK .055 DIA. LEAK 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. OIL TEMP 65°F Stamp: ROLLS-ROYCE, LIMITED TEST ROOM. 28 JAN 1927 DERBY. | ||
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).