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).
Coil spring specifications for the 'Myth' front suspension system.
| Identifier | ExFiles\Box 110\3\ scan0019 | |
| Date | 6th December 1940 | |
| To Rm.{William Robotham - Chief Engineer} from Ev{Ivan Evernden - coachwork}/DB.{Donald Bastow - Suspensions} C. to Ev.{Ivan Evernden - coachwork} & Rm{William Robotham - Chief Engineer}/HH. 746 Ev{Ivan Evernden - coachwork}/DB.{Donald Bastow - Suspensions}3/ET.6.12.40. FRONT SUSPENSION MYTH. 1030 PL.428, attached to this memo, shows the coil spring for the Myth front suspension, suitable for a sprung load of 600 lbs. at the wheel and having a rating corresponding to a static deflection of 5.5", assuming that the various bushes in the suspension linkage have a rating of 25 lb/in. at the wheel. The low maximum stress, i.e. 96,000 lbs/in2 approx., corrected, implies that the material can be inferior to that used on the B.V springs. It also implies that the weight of the spring is on the high side and a later scheme will show a higher stressed spring which can be used if weight reduction is desired. Ev{Ivan Evernden - coachwork}/DB.{Donald Bastow - Suspensions} DB{Donald Bastow - Suspensions} Original of PL.428 to Rm{William Robotham - Chief Engineer}/HH. Prints to Rm{William Robotham - Chief Engineer}/HH., Ev.{Ivan Evernden - coachwork} & Ashby. | ||