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).
Recommendations for using sheet asbestos for heat insulation on floorboards and subframe cross members.
| Identifier | WestWitteringFiles\P\2July1926-September1926\ Scan038 | |
| Date | 9th August 1926 | |
| Contd. -2- Hs{Lord Ernest Hives - Chair}/AJL1/T9.8.26. at present. Better results than those obtained by lagging the silencer can be obtained by a fixed sheet asbestos to the underside of the rear compartment floorboards. In this case the asbestos is further away from the cause of the heat and consequently has less to do than when wrapped round the silencer itself. In the case of subframe bodies it is absolutely essential that the subframe cross member which passes across the rear compartment be lagged on its underside. This becomes very hot and retains its heat much longer than the floorboards themselves. The practice of lagging the underside of floorboards has been carried out by coachbuilders for years in respect to the swan neck and has been successful. We have not tried the sheet metal tray as suggested, as we are of the opinion that results would not be as good as asbestos and the latter method is much simpler. Our recommendations are therefore - (1) Well fitting, perfectly gas-tight, floorboards, preferably edged with rubber rubbing as on front floorboards of subframe bodies. (2) Rear floorboards to be fitted with sheet asbestos on their underside. (3) In the case of subframe bodies, the subframe cross member to be asbestos lagged on its underside. (4) Sorbo rubber mats, carpet, etc. as per present practice. Hs{Lord Ernest Hives - Chair}/A.J.Lidsey. | ||