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 of bumper spring test results, detailing breakages, test durations, and dates.
| Identifier | ExFiles\Box 80\2\ scan0069 | |
| Date | 15th April 1920 | |
| X2628 BUMPER TESTS Spring. Position. Wgt. Remarks. hrs. mins. Date. F.6408 N.S. 2000 lbs Broken 3rd. leaf down. 9 0 12.2.20 F.6408 N.S. 2000 " Bottom leaf broken. 15 55 14.2.20 F.6410 O.S. 2100 " Flaw on innerside of 14 30 14.2.20 bottom leaf. F.6410 O.S. 2100 " Broken 3rd. leaf from 17 15 20.2.20 bottom. F.6410 O.S. 2100 " Broken 4th. leaf from 18 5 23.2.20 bottom. F.6410 O.S. 2100 " Broken 5th. leaf up. 20 0 24.2.20 F.6409 N.S. 2000 " Bottom leaf broken. 10 55 5.3.20 F.6409 N.S. 2000 " Second leaf down broken. 14 15 6.3.20 F.6409 N.S. 2000 " Broken 2nd. leaf up. 18 35 10.3.20 F.6409 N.S. 2000 " 3rd. leaf up broken. 19 50 11.3.20 F.7789 O.S. 2100 " Bottom leaf broken. 17 30 12.3.20 F.6409 N.S. 2000 " Bottom leaf broken. 26 55 16.3.20 F.7789 O.S. 2100 " 4th. leaf up broken. 24 50 17.3.20 F.7788 N.S. 2000 " Bottom leaf broken. 10 45 27.3.20 F.7789 O.S. 2100 " 4th. leaf down broken. 15 15 30.3.20 F.7788 N.S. 2000 " 3rd. leaf from bottom 19 45 31.3.20 broken. F.7788 N.S. 2000 " 2nd. down and bottom leaf 21 50 7.4.20 broken. F.7788 N.S. 2000 " 3rd. and 4th. leaf from 24 45 9.4.20 top broken. F.7789 O.S. 2100 " Second leaf up broken and 25 10 12.4.20 bottom leaf cracked. F.7788 N.S. 2000 " 3rd. leaf from top and 28 55 13.4.20 2nd. from bottom. F.7789 O.S. 2100 " 4th. leaf broken down 35 35 14.4.20 and 3rd. up broken. F.7788 N.S. 2000 " Bottom leaf broken - flaw 38 35 15.4.20 in 2nd. leaf from top & 2nd. leaf from bottom broken. | ||