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 sheet detailing results from a rear axle bumper test, recording component failures and replacements over several test cycles.
| Identifier | ExFiles\Box 119\2\ scan0102 | |
| Date | 31th May 1920 | |
| Test 1. AS REAR AXLE ON BUMPER TEST. Total hours run on chassis. | Remarks. | Hours run. --- | --- | --- 31.5.20 | O.S. Spring F.7790 2200 lbs. N.S. " F.7789 2100 lbs. Spring Main Bearing Bracket. O.S. bolt broken F.419. | 1 hr. 45 mins. 1.6.20 | O.K. | 7 " 10 " 2.6.20 | Bolt on diagonal stay K.7407 broken. | 71 " 15 " 2.6.20 | Spring taken off. | 14 " 35 " Test 2 3.6.20 | New Springs fitted. N.S. F.7787 - 1900 lbs. O.S. F.7788 - 2000 lbs. N.S. Spring main bearing bracket bolt F.419 | 17 " 30 " 4.6.20 | Spring to clip O.S. broken. | 6 " 55 " 5.6.20 | O.K. | 15 " 50 " 7.6.20 | F.419 bolt broken (spring main bearing bracket) | 17 " 5 " 8.6.20 | Spring N.S. 1, 2, 3 and 4 leaves broken under rear clip. | 21 " 15 " Test 3. 10.6.20 | New parallel springs fitted 363Z. 2120 lbs. 363Y. 1990 lbs. | Contd. | ||