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 log sheet detailing failures and repairs of springs and shock absorbers under the title 'Bumper Test'.
| Identifier | ExFiles\Box 119\2\ scan0119 | |
| Date | 7th August 1920 | |
| X 1331 BUMPER TEST New springs fitted O.S. F.363 2212 lbs. N.S. F.363 2100 lbs. Handwritten: X.3981 (struck through) O.S. Shock Absorber casing loose, ball race loose - retightened up. N.S. Shock absorber - fibre plate 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 leave. 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 brolen 2nd. leaf rear of clip. 22 " 25 " O.S. 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. | ||