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 results and proposed standardisation for shock damper springs on 40/50 HP and 20 HP models.
| Identifier | ExFiles\Box 68\2\ scan0196 | |
| Date | 17th June 1927 | |
| To BY.{R.W. Bailey - Chief Engineer} from Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} 78520 Hs{Lord Ernest Hives - Chair}/Rm{William Robotham - Chief Engineer}1/LG17.6.27. SHOCK DAMPER LOADING. 78520/X235 Further to our Hs{Lord Ernest Hives - Chair}/Rm{William Robotham - Chief Engineer}3/LG2.6.27. We have now tested out springs F.75168 with various free lengths with the following results. L.P. loads taken with air vent blocked up. H.P. loads with .056" washer under cap. 40/50 HP. Front. Up. F.75168 free length .485 65-70 lbs. Rear. Up. F.75168 " " .550 68-73 lbs. 20 HP. Rear. Up. F.75168 free length .485 40-45 lbs. Down. F.75148 58-62 lbs. We send you herewith four F.75168 free length .485 and four free length .550. If these on production give loadings comparable to those we have obtained, we should like to know whether you have any objection to standardising them. The complete table of shock absorber loadings will then read :- 40/50 HP. Front. Up. F.75168 free length .435 Load 65-70 lbs. Down. F.75081 " " " Load 77-83 lbs. Rear. Up. F.75168 " " .550 Load 68-73 lbs. Down. F.76548 " " " Load 77-83 lbs. contd :- | ||