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).
Comparing the ride characteristics of spring seat cushions versus Dunlopillo cushions, illustrated with acceleration-time graphs.
| Identifier | ExFiles\Box 132\3\ scan0226 | |
| Date | 29th December 1938 | |
| γ 1122 To By.{R.W. Bailey - Chief Engineer} from Rm{William Robotham - Chief Engineer}/AFM.{Anthony F. Martindale} c. Ds. c. Da{Bernard Day - Chassis Design}/Ev.{Ivan Evernden - coachwork} c. Rm{William Robotham - Chief Engineer}/FD.{Frank Dodd - Bodies} c. Hn.{F. C. Honeyman - Retail orders} W/S. Rm{William Robotham - Chief Engineer}/AFM.{Anthony F. Martindale}3/WH.29.12.38. RIDE OF CARS - SEAT CUSHIONS. A passenger in a car is supported on three sprung and damped systems:- (1) The tyres. (2) The main chassis suspension. (3) The seat cushions. If damping in any of these three systems is lacking, then the ride uncomfortable. If the cushions are incorrectly constructed, a good suspension can be spoilt. It is desirable that all coachbuilders should know how to build a seat cushion to get the best results. 'Dunlopillo' cushions automatically provide the right amount of damping but they are unacceptable to Sales. In addition they are heavy. It is possible to make a spring seat cushion which has identical characteristics to a 'Dunlopillo' seat. The two 'ride' records (acceleration - time graphs) show how similar the two types of cushion can be. SPRING CUSHIONS. DUNLOPILLO | ||