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 the results of a bumper test, including component failures and run times.
| Identifier | ExFiles\Box 80\2\ scan0257 | |
| Date | 23th November 1920 | |
| AJS BUMPER TEST. X2628 23.11.20 New frame fitted complete except 3rd. cross member. Also new steering pad and bell crank levers. Date. | Total hrs. run. | Remarks. ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------- 25.11.20 | 7 hrs. 55 mins. | Measurements of Ballast box taken. 26.11.20 | 11 " 55 " | O.S. spring broken 3rd, 4th, 5th, 6th and 11th. leaves. New spring fitted O.S. F.4631 1000 lbs. 28 hrs. 20 mins. | 14 " 50 " | Rear clip N.S. spring broken. | 15 " 5 " | N.S. spring broken 4th. 10th. and 11th. leaves. F.4630 900 lbs. 15 hrs. 35 mins. 29.11.20 | 18 " 50 " | New spring fitted N.S. F.4630 900 lbs. Bolt on N.S. spring broken. 30.11.20 | 22 " 15 " | Bolt broken O.S. spring. 1.12.20 | 27 " 50 " | Top leaf O.S. spring broken 1/2" rear of rear clip. F.4631 1000 lbs. 15 hrs. 55. mins. 2.12.20 | | New spring fitted O.S. F.4631 1000 lbs. 3.12.20 | 36 & 55 " | Top leaf N.S. spring broken. Ball retaining ring burst on drum bearing. O.S. spring F.4631 1000 9 hrs 5 F.4630 950 lbs. 21 hrs. 50 mins. | ||