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).
Methods for sound-insulating a sheet metal dash using plastic material and felt.
| Identifier | ExFiles\Box 132\3\ scan0180 | |
| Date | 18th June 1938 | |
| Handwritten notes: WYMAN noted SECRET Gag File Expect Dodel will keep you in touch with what is being done Dan 1125 Typed content: To Rm.{William Robotham - Chief Engineer}. from Ev.{Ivan Evernden - coachwork} o.{Mr Oldham} By.{R.W. Bailey - Chief Engineer} Da.{Bernard Day - Chassis Design} Rm{William Robotham - Chief Engineer}/FD.{Frank Dodd - Bodies} Da{Bernard Day - Chassis Design}/JD.{J. Draper - Frames} Da{Bernard Day - Chassis Design}/Ev.{Ivan Evernden - coachwork}3/N.18.6.38. Re: Sheet Metal Dash -LB.50. We do not know whether you have formed any idea of how to sound insulate the sheet steel dash. From what we have read and been told, to apply the Seapak as on the cast dash does not appear likely to be satisfactory. We suggest as one method of treatment that the back of the dash be coated with a layer of some plastic material such as the Silenco, used by coachbuilders on door panels to prevent drumming, ( a similar material was on the Jaguar dash), and then covered with .750" thick soft felt. The carpet would be taken up as high as possible. [Signature] | ||