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).
Tests to eliminate excessive headlamp vibration on Bentley chassis models.
| Identifier | ExFiles\Box 3\6\ 06-page183 | |
| Date | 25th May 1934 | |
| Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} X4553 Hs{Lord Ernest Hives - Chair}/FD.{Frank Dodd - Bodies}9/KW.25.5.34. Bentley Head Lamp Vibration. We have carried out a series of tests on B-23-AE and 3-B-IV to eliminate the excessive amount of Head Lamp movement. B-23-AE - Streamlined Bentley. This is the worst specimen for head lamp vibration we have, as with the cycle type mudguards fitted, there is no support from the mudguard stays and wings. The Head Lamp Pillars do not ride the frame by .025" and are held in position by plates bolted through the frame, with an aluminium packing piece between, this packing prevents the plate tightening on the edges of the frame. On chassis fitted with the standard type of mudguards we fit an aluminium plate between the wing stay and the frame, which means that the lamp pillar is supported on one side with alum. backed up with the wing stay, and the other side with steel. This is very unsatisfactory as the type of bolts used cut into the alum. and we get a poor support for the lamp pillar. We suggest steel be substituted for alum. On examination we found that B-23-AE chassis had only the alum. plate supporting the lamp pillar on the outside of the frame, with no support from the wing stay, this car having cycle type mudguards. The first test therefore was carried out with a steel plate substituted for the alum. one. Result - This only had the effect of tightening up the lamp pillar to the frame, and it was obvious that it was the frame itself twisting which resulted in the head lamp movement. | ||