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).
Test report detailing failures of 12.5% stiffer front springs on car 98-NK during a bump test.
| Identifier | ExFiles\Box 73\3\ scan0265 | |
| Date | 11th December 1924 guessed | |
| SHEET 11. TEST NO.1X. FIRTHS 12½% STIFFER FRONT SPRINGS - 98-NK CAR. Only troubles consisted of :- Frome side members cracked where RR. spare wheel carriers are fitted. N.S. front spring rear suspension bracket very slightly cracked. These springs were discarded having been found unsatisfactory on the Derby Bump Test. MILEAGE OF TEST 2,129 - AVERAGE SPEED 37.2 M.P.H. | ||