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).
Modifications to body mountings and noise analysis for car 3.B.50.
| Identifier | ExFiles\Box 111\3\ scan0113 | |
| Date | 27th June 1939 | |
| 800b. To Da.{Bernard Day - Chassis Design} from Rm{William Robotham - Chief Engineer}/Caswell. c. Da{Bernard Day - Chassis Design}/Ev.{Ivan Evernden - coachwork} c. Rm{William Robotham - Chief Engineer}/Wym.{G. Harold Whyman - Experimental Manager} c. Rm{William Robotham - Chief Engineer}/FD.{Frank Dodd - Bodies} Rm{William Robotham - Chief Engineer}/Caswell.4/MH.{M. Huckerby}27.6.39. Re 3.B.50. Fitted with standard "Floatex" body mountings this car was driven some distance to get the feel of its characteristics. All body mountings, except those supporting cowl, were then removed and pieces of 3/8" rubber strip, 45° hardness, fitted. For convenience in insulating body bolts from frame 1/4" dia. bolts were used. During this operation care was used in fitting the necessary packing pieces so that doors would hang correctly and allow wedges to accurately engage their respective striker plates. This state of affairs did not previously exist. The doors, where showing signs of fouling posts, were given increased clearance by filing, the bonnet receiving similar treatment. The rubber pads were packed out until they shared responsibility for supporting the doors. As originally fitted they failed to do so by about 1/8". BODY. On the road, the hammering in the region of cowl and front door posts, very pronounced during first run, was found to have disappeared. The credit for this is not given to the rubber mountings. As far as body noises are concerned, whilst no improvement was noticed, no deterioration was evident. This car, 3.B.50, is quieter in rear seats than in front. There is a continual growling or rumbling very noticeable in front compartment either with engine running or drifting in neutral with engine off. The noise appears to be road noise. It is also felt in the steering. The rear seats are quieter. | ||