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).
Proposal for a cost and weight-saving modification to the Bentley 50 axle PD.91.
| Identifier | ExFiles\Box 111\4\ scan0026 | |
| Date | 9th February 1938 | |
| 1044 To By.{R.W. Bailey - Chief Engineer} from Rm{William Robotham - Chief Engineer}/FJH.{Fred J. Hardy - Chief Dev. Engineer} c. Da.{Bernard Day - Chassis Design} c. Da{Bernard Day - Chassis Design}/Hdy.{William Hardy} Rm{William Robotham - Chief Engineer}/FJH.{Fred J. Hardy - Chief Dev. Engineer}2/AP.9.2.38 802. BENTLEY 50. AXLE PD.91. We suggest that an economy could be effected on the centre casing of Bentley 50 axle PD.91 by incorporating the off-side end plate in the alum. centre casing. The saving would be approximately 10/- per chassis cost and 2 lbs. per chassis weight. The principle feature of this modification is that there would no longer be through bolts connecting the two axle tubes so that the aluminium would be subject to tension. The original 20.HP. had a similar feature with the addition of a tie bar and so far as we can ascertain no failures occurred. The Alvis 3 1/2 litre also uses an unreinforced aluminium axle. We believe that Da{Bernard Day - Chassis Design}/Hdy.{William Hardy} is at present investigating the possibility of this construction. Rm{William Robotham - Chief Engineer}/FJH.{Fred J. Hardy - Chief Dev. Engineer} | ||