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).
Bumper test report on American type front road springs.
| Identifier | ExFiles\Box 43\2\ Scan245 | |
| Date | 29th March 1928 | |
| 43980 Hs{Lord Ernest Hives - Chair}/AJL/LG29.3.28. BUMPER TEST ON AMERICAN TYPE FRONT ROAD SPRINGS. X3900 X.8772 X840 Conditions of test as all previous tests i.e. 105 drum revs/min., tyre pressures 60 lbs/sq.in., weight of front of chassis 15 cwts. 1 qr. 24 lbs. Particulars of springs. (1) Chinese American spring - 1150 lbs. Initial camber 3 31/32 Silico Manganese. Drg. No. A.{Mr Adams} 8546. On N/S ran 8 hrs. 16 mins. Top leaf broke 7" from rear. (2) As (1) 1160 lbs. Initial camber 3 5/8". On O/S ran 9 hrs. 46 mins. Top leaf broke 9" from rear. (3) T.F. & S. Design. 1090 lbs. Initial camber 3 5/16". Silico Manganese. Drg. No. A.{Mr Adams} 8546. On N/S ran 13 hrs. 50 mins. Top leaf broke 7" from rear. (4) As (3) 1100 lbs. Initial camber 3 5/16". On O/S ran 13 hrs. 10 mins. Top leaf broke near centre bolt. (5) Spring made exactly to instructions on the American sheets. 1351 lbs. Initial camber 4 3/32" Silico Manganese. Drg. A.{Mr Adams} 8546. On N/S ran 8 hrs. 46 mins. Top leaf broke near centre bolt. (6) As (5) 1400 lbs. Initial camber 4 1/8". On O/S ran 6 hrs. 30 mins. Top leaf broke near centre bolt. Average life of the above six springs 10 hrs. 3 mins. Hs{Lord Ernest Hives - Chair}/A.J.Lidsey. | ||