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 and failures during a bumper and spring endurance test.
| Identifier | ExFiles\Box 80\2\ scan0198 | |
| Date | 30th August 1920 | |
| X.26286 76EC/ BUMPER TEST. (filed 30.8.20) X.26286 New Springs fitted O.S. F.391 2324 lbs. N.S. F.{Mr Friese} 2286 lbs. X.1331 Running with shock absorbers. | Date. | Total hrs. run. | Remarks. | |---|---|---| | 10.8.20 | 1 hr. 30 mins. | Rod connected to radiator loose. | | | 4 " 35 " | O.K. | | 11.8.20 | 8 " 15 " | Bolt broken (rear) centre main brg. K.419. 70 hrs. 5 mins. Top leaf N.S. front spring broken (Amer:) between clip. Spring broke whilst bumping rear axle. - 199 hrs. 55 mins. Front axle on bump - total hrs. run 32 hrs. Front wheels held in blocks - spring taking shock from rear axle being bumped 167 hrs. 55 mins. | | 12.8.20 | 15 " 35 " | O.K. | | 13.8.20 | 16 " 45 " | Centre main bearing bracket broken O.S. 143 hrs. 50 mins. F.419. New bracket fitted. | | 14.8.20 | 22 " 50 " | O.K. | | 16.8.20 | 29 " 15 " | O.K. | | 17.8.20 | 34 " 55 " | O.K. Shock absorbers O.K. 39 hrs. 50 mins. | | 18.8.20 | 39 " 50 " | Spring on O.S. broken - 6th. leaf rear of clip. F.391. 2324 lbs. 39 hrs. 50 mins. | | 19.8.20 | | New Spring fitted O.S. F.{Mr Friese} 2386 lbs. | | | 1 " 40 " | Spring broken N.S. 2nd. leaf under rear clip. F.{Mr Friese} 2286 lbs. 42 hrs. 30 mins. | Contd. | ||