Bumper test report detailing failures over time and subsequent Brinell hardness tests on a broken spring.
| Identifier | ExFiles\Box 80\2\ scan0302 | |
| Date | 1st July 1920 | |
| R.R. 285A (100 T) (S.G. 643. 19-2-20) G. {Mr Griffiths - Chief Accountant / Mr Gnapp} 2618 X.3981. X.1331. BUMPER TEST. X.3981. Sprinm with 12 leaves O.S. F.4666 - 2000 lbs. N.S. F.4665 - 2226 lbs. Date Total Remarks 24.6.20. 25.6.20. 7 hrs. 45 mins. Bolts and cap K.419 broken O.S. centre main bearing brkt. 26.6.20. 28.6.20. 29.6.20. 30.6.20. 1.7.20. 35 hrs. 40 mins. Bolt broken centre main bearing bracket O.S. K.419. 1.7.20. 36 " 45 " Bottom leaf O.S. broken 5" from rolled eye. Front diagonal stay broken close to cross member. BRINELL TESTS OF BROKEN SPRING. 1st. 415 O.K. 2 444 " 3 495 " 4 495 " 5 444 " 6 461 " 7 461 " 8 415 " 9 444 " 10 444 11 415 12 444 & 388 where broken. | ||
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).