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).
Log from a Bumper Test detailing failures of spring and shock absorber components.
| Identifier | ExFiles\Box 80\2\ scan0180 | |
| Date | 7th August 1920 | |
| HS.{Lord Ernest Hives - Chair} X2628 BUMPER TEST New Springs fitted O.S. F.363 2212 lbs. N.S. F.363 2100 lbs. O.S. Shock Absorber casing loose, ball race loose - retightened up. N.S. Shock Absorber - fibre plates burnt out, new plates fitted. Total run of Shock absorbers up to and including 27.7.20 - 152 hrs. 50 mins. Date. Total hrs. run. Remarks. 29.7.20 13 hrs. 15 mins. New rollers and bushes fitted N.S. & O.S. roller brackets. N.S. Spring broken 1st. & 2nd. leaves. F.363 - 2100 lbs. 30.7.20 14 " 10 " N.S. Spring broken 2nd. leaf rear of clip. F.363 - 2100 lbs. New spring fitted N.S. F.363 2100 lbs. 2.8.20. 20 " 45 " O.S. Spring broken 2nd. leaf rear of clip. 22 " 25 " O.S. spring broken 3rd. leaf under front clip. F.363 2212 lbs. 3.8.20. New spring fitted F.363. New bearing fitted centre of rear spring N.S. O.S. Shock Absorber worked loose, end play developed. End-play taken up and made O.K. N.S. shock absorber lever worked loose on shaft made O.K. 5.8.20 16 " 15 " Top leaf N.S. spring cracked under front clip. F.363 - 2100 lbs. 6.8.20 23 " N.S. spring broken 3rd. leaf front of clip - F.363 - 2100 lbs. 25 " 45 " N.S. spring cracked 2nd. leaf front of clip. 7.8.20. 17 " 30 " O.S. spring cracked 1st., 2nd., 3rd. & 4th. leaves front of clip. F.363 2212 lbs. | ||