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).
Confidential information extracted from Humber regarding the De Normanville Overdrive gearbox.
| Identifier | ExFiles\Box 136\2\ scan0047 | |
| Date | 7th February 1939 | |
| 1153 SECRET. To By.{R.W. Bailey - Chief Engineer} from Rm{William Robotham - Chief Engineer}/Gry.{Shadwell Grylls} c. Da.{Bernard Day - Chassis Design} c. Da{Bernard Day - Chassis Design}/Hdy.{William Hardy} Rm{William Robotham - Chief Engineer}/Gry.{Shadwell Grylls}7/MH.{M. Huckerby}7.2.39. DE NORMANVILLE OVERDRIVE. We have extracted some confidential information from Humbers about this gearbox. Their transmission engineer says that in its final form it is a reliable mechanism having a very pleasant operation. It is essential however, he says, to observe the following points:- (1) The separate oil feed for the hydraulic piston is necessary to prevent dirt on the valve seat. (2) The valve seat material must be what they finally used and is now in De N's sample box. (3) The clutch linings must be the brand of 'Halo' now in the box. (4) The prop shaft joints should go up one size. Rm{William Robotham - Chief Engineer}/Gry.{Shadwell Grylls} | ||