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).
Letter to Toledo Woodhead Springs Ltd. with specifications for four sample springs required for testing.
| Identifier | ExFiles\Box 154a\4\ scan0141 | |
| Date | 21th January 1941 | |
| 1306 Rm {William Robotham - Chief Engineer} /C1m8/BT. {Capt. J. S. Burt - Engineer} 21st January, 1941. Messrs. Toledo Woodhead Springs Ltd., Toledo Steel Works, S H E F F I E L D. {John DeLooze - Company Secretary} Dear Sirs, We should be much obliged if you could make up for us four sample springs to the following specification. We require them for test purposes. | Leaf No. | Thickness | Length of leaves when flat. | Free radius | |----------|-----------|-----------------------------|-------------| | 1 | .254" | 44" | 53.6" | | 2 | .231" | 41" | 41.6" | | 3 | " | 35.875" | " | | 4 | " | 30.79" | " | | 5 | " | 25.71" | " | | 6 | .208" | 20.63" | 34.1" | | 7 | " | 16.03" | " | | 8 | " | 11.43" | " | | 9 | " | 7" | " | The rate when flat is 132 lbs/in. and the maximum stresses are 150,000 in compression and 125,000 in tension. The leaves should be shot blast on the tension side at the rate of 20 sq.ins. per minute. As shot blasting increases the free radius of the springs, the quench radii will be less than those given. They are to be grooved section steel, of course, and the leaves should be tapered in thickness for 2.25" at the ends. Width of leaves 1.75". Both eyes should be off-set upwards. The camber at full bump is 3.98" negative. | ||