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).
The supply of spring steel for Phantom III cushion springs from Borg & Beck and testing alternative materials.
| Identifier | ExFiles\Box 129\4\ scan0001 | |
| Date | 1st October 1937 | |
| To Rm.{William Robotham - Chief Engineer} from Rm{William Robotham - Chief Engineer}/NRC.{N. R. Chandler} c. By.{R.W. Bailey - Chief Engineer} [Handwritten]: X 111 O Rm{William Robotham - Chief Engineer}/NRC.{N. R. Chandler}1/MH.{M. Huckerby}1.10.37. RE BORG & BECK. B. & B. have only been able to obtain enough spring steel for the P.III cushion spring for about 100 more clutches from date. The steel now used is .031 thick, and no more is obtainable for four months. Roy.{Sir Henry Royce} has given them a number of names, but no stocks available. They have now submitted a sample .035 - .036 thick, By.{R.W. Bailey - Chief Engineer}/EM approves Brinell, but this will increase stiffness by approx. 45%, which means the cushioning would be about .032 to .036 instead of .045 to .050. The 6 American Long plates had a cushion of .026, but we did not notice any marked difference in operation. I therefore phoned Mr. Armitage to-day, and asked him to prepare one plate with springs from this steel for us to try. Re 10" and 11" Thermoid facings. Supplies are expected next week, but advice of actual shipment not yet received. Rm{William Robotham - Chief Engineer}/NRC.{N. R. Chandler} | ||