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).
Test report on parts for 20/25 HP shock dampers, with load test results for springs and caps.
| Identifier | ExFiles\Box 105\3\ scan0200 | |
| Date | 29th October 1931 | |
| X5520. To By.{R.W. Bailey - Chief Engineer} from Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} c. to BY/HEB.{H. Biraben} Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}2/KT.29.10.31. 20/25 HP. SHOCK DAMPERS. With reference to memo. BY/HEB{H. Biraben}9/M.25.8.31. The following parts were tested on a 20 HP. damper. F.55944 LOP. Front - 7¼" Lever. F.58160 L.P. Valve Spring. F.58162 " " Cap (.100" deep) F.55965 LOP. Rear - 11.625" Lever. F.58160 L.P. Valve Spring F.58161 " " Cap (.050" deep) The depth from the top of the piston to the valve spring seat was set to .350". With the cap depths correct to drawing, the ball pin loads were definitely high. The depths were therefore modified to give the correct loads. | | F.58160 Spring | F.58162 Cap-Front | F.58161 Cap-Rear. | | Index No. | Length under | .100" cap | .106" cap | .050" cap | .073" cap | | | 32 lb. load ins. | Ball Pin | Ball Pin | Ball Pin | Ball Pin | | | | Load-Lb. | Load-Lb. | Load-Lb. | Load-Lb. | |----------------|-------------------|-----------|-----------|-----------|-----------| | 1 | .449 | 105 | 90 + | 125 | 90 | | 2 | .458 | 112 | 98 + | 140 | 110 + | | 3 | .450 | 110 | 88 + | 130 | 93 | | 4 | .455 | 105 + | 98 # | 120 | 98 + | + Figures Checked. # Checked five times. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} | ||