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 on steering with Wraith wheel movement and suspension levers, detailing spring flexibility tests to reduce joggles.
| Identifier | ExFiles\Box 95\1\ scan0415 | |
| Date | 17th June 1937 | |
| To E.{Mr Elliott - Chief Engineer} from Rm{William Robotham - Chief Engineer}/FJH.{Fred J. Hardy - Chief Dev. Engineer} a.{Mr Adams} Hs.{Lord Ernest Hives - Chair} b. By.{R.W. Bailey - Chief Engineer} c. Da.{Bernard Day - Chassis Design} d.{John DeLooze - Company Secretary} Ev.{Ivan Evernden - coachwork} Rm{William Robotham - Chief Engineer}/FJH.{Fred J. Hardy - Chief Dev. Engineer}1/AP.17.6.37 PH.III. STEERING WITH WRAITH WHEEL MOVEMENT SUSPENSION LEVERS. During the running of 35-EX. in France, tests were carried out to determine the least amount of flexibility required in the rear side steering tube joint to give freedom from joggles with the following results - Rating of Springs. Travel Each way Results. 2600 lbs/in. 0.110 No joggles on straight roads. Joggles when cornering. 2800 lbs/in. 0.230 No joggles at any time but extra sponge noticeable. 5200 lbs/in. 0.120 Light joggles both straight ahead and cornering. 3470 lbs/in. 0.160 No joggles straight ahead. Occasional light joggles on corners. Improvement for controllability. The last arrangement as shewn on Rm.{William Robotham - Chief Engineer}330/393 was reported on as being the best compromise so we have started a Standardisation sheet for this in conjunction with Wraith wheel movement. Rm{William Robotham - Chief Engineer}/FJH.{Fred J. Hardy - Chief Dev. Engineer} Prints Rm.{William Robotham - Chief Engineer}330/393 attached. | ||