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).
New design for the 'Myth' Cross Steering Lever, including stress calculations.
| Identifier | ExFiles\Box 110\3\ scan0100 | |
| Date | 3rd April 1941 | |
| 750 1080 To Rm{William Robotham - Chief Engineer} from Ev{Ivan Evernden - coachwork}/DB.{Donald Bastow - Suspensions} Copy to Rm{William Robotham - Chief Engineer}/HH. [struck through] Ev.{Ivan Evernden - coachwork} [struck through] Ev{Ivan Evernden - coachwork}/DB.{Donald Bastow - Suspensions}11/ET.3.4.41. CROSS STEERING LEVER - MYTH Attached to Rm{William Robotham - Chief Engineer}/HH's copy is the original of PL.537, Cross Steering Lever, Myth. This design supersedes that of PL.517, which was discovered to foul the bump stop on lock. This later scheme has the incidental merits of being lighter and cheaper than PL.517. Assuming that the lever lower boss heels at a point '.400"' from the bolt centre, i.e. .037 inside the extremity of its face, and that the maximum load at the ball pin is 200 lbs., the stress in the lower bolt securing the lever is approximately 26,000 lb/in2. The load of 200 lbs. at the ball pin corresponds to 1000 lbs/ins. at the road wheel steering pivot pin. Ev{Ivan Evernden - coachwork}/DB.{Donald Bastow - Suspensions} DB{Donald Bastow - Suspensions} Original to Rm{William Robotham - Chief Engineer}/HH. Prints to Rm{William Robotham - Chief Engineer}/HH., Ev.{Ivan Evernden - coachwork} and Ashby. | ||