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).
The use of rubber mountings and sound-deadening materials on Experimental Car 22-G-V.
| Identifier | ExFiles\Box 101\1\ scan0142 | |
| Date | 29th February 1936 | |
| To Hs{Lord Ernest Hives - Chair}/Hm.{Capt. W. Hallam - Head Repairs} 1500 a Hs{Lord Ernest Hives - Chair}/FD.{Frank Dodd - Bodies}6/JH. 29.2.36. Experimental Car. 22-G-V.{VIENNA} For Experimental purposes and with a view to finding the value of rubber mounting for silence, the standard Thrupp & Maberly Limousine body on this car has been mounted as near as possible to design LeC.4849. The mounting is a copy of the Ph.III using rubber body packings of .375" thickness and of 35 durometer hardness. The same steel washers, cups and rubber blocks are used as on Ph.III. The scuttle is fitted with RR. semi-isolation scheme but no transverse stays are fitted to the body and chassis. The whole of the body panelling including doors scuttle etc. have been lined with Seapak material. The underside of the roof is lined with felt. The dashboard is covered with 6 layers of Seapak making a thickness of 1.000". This is afterwards covered with carpet material to match the floor carpets. From the knowledge gained in the U.S.A. both in front and rear compartments, cloth upholstery has been used in place of leather to absorb noise. Results. We have not as yet been able to make any comparative tests owing to engine modifications being necessary and the car is at present in the fitting shop. A report on the silence obtained or otherwise will follow later. Hs{Lord Ernest Hives - Chair}/F.Dood. | ||