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).
Information providing the rating specifications for 'silentbloc' bushes.
| Identifier | ExFiles\Box 127\2\ scan0074 | |
| Date | 3rd April 1939 | |
| To Rm.{William Robotham - Chief Engineer} from Rm{William Robotham - Chief Engineer}/FWK. Rm{William Robotham - Chief Engineer}/FWK7/R.3.4.39. SILENTBLOCS. Below is some information re the rating of 'silentbloc' bushes as requested :- New Bush 2.7 lbs/in. hysteresis 2.9 lb.(max. Bush after 50 hours. Bumping 2.27 lbs/in. hysteresis 4.0 lb.(max.) The above figures were obtained by hanging weights on the end of a 15" lever and measuring the deflection at that point. Rm{William Robotham - Chief Engineer}/FWK. | ||