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 test on vehicle springs and shock absorbers.
| Identifier | ExFiles\Box 119\2\ scan0125 | |
| Date | 30th August 1920 | |
| X.1331 (filed 30.8.20) BUMPER TEST. New Springs fitted O.S. F.391 2324 lbs. X.26281 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 1 " 40 " New Spring fitted O.S. F.{Mr Friese} 2386 lbs. Spring broken N.S. 2nd. leaf under rear clip. F.{Mr Friese} 2286 lbs. 42 hrs. 30 mins. Contd. | ||