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).
Comparison of plate pressure on the DES.38 servo, detailing torque loss and differences in actuating thread angles.
| Identifier | ExFiles\Box 72\4\ scan0347 | |
| Date | 12th July 1923 guessed | |
| contd:- -2- The difference between this and the actual torque obtained from two plates represents the torque lost to the dog friction resisting any increase in plate pressure. From this we can obtain the loss of plate pressure. PLATE PRESSURE ON DES.38 SERVO. The plate pressure on the WW. servo fitted with 45° actuating thread is half that which was employed on the DES.38 servo, and when fitted with 35° thread is only .37 that of the DES.38. (This is the first flat disc servo made to apply to existing cars). Hs{Lord Ernest Hives - Chair}/ACL. | ||