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).
List of seven modification points from Mr. Royce regarding scheme N.SCHEME-107 for the 20 HP Propeller Shaft and Torque Tube.
| Identifier | WestWitteringFiles\C\September1919\ Scan2 | |
| Date | 1st September 1919 | |
| To DA.{Bernard Day - Chassis Design} from E.{Mr Elliott - Chief Engineer} Copy to Gd. (struck through) DM.{D. Munro} EFC. x.3539. RE 20 HP.PROPELLER SHAFT AND TORQUE TUBE - N.SCHEME-107. ORIGINAL (Stamp) RECEIVED (Stamp) E2/G2/9/19. 3 With reference to the above, would you kindly note that Mr. Royce has criticised this scheme and the following is the summation of the points which should be modified :- (1) Turn down the outside of the propeller shaft still further, so as to make the wall of the tube thinner. (2) Leave sufficient clearance endways for the propeller shaft and also make a series of washers at one end of different thicknesses in suitable steps, to cover the variations which will XXXXXX affect the end clearance of the propeller shaft. The washers can be used under one of the pieces which provide spherical end seats for the propeller shaft. (3) Not so many pins should be used in the brazed joint at the spherical end of the torque tube, particularly delete those pins in the thin outside edge of the flanged piece. (4) Do not use reinforcing sleeves in the end of the pro-peller shaft tube. (5) Provide a lead on for the rear castellated joint to enable the propeller shaft to be easily engaged. (6) Arrange some differences so that the propeller shaft cannot be put in the wrong way round. It may be found that this point will be conveniently provided for in the alterations required for the lubrication system. (7) Cannot the torque tube be two-thirds of the thickness shown at the top end where it is brazed to the front flange piece ? (Contd.) | ||