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).
Pedal knock issue, potential modifications, and proposed elimination schemes.
| Identifier | ExFiles\Box 93\3\ scan0331 | |
| Date | 2nd July 1932 guessed | |
| -2- The existing dies for the pedal F.89450 can easily be modified to provide an elongated boss for the operating pin to suit the 1.400 radius. With regard to the anchorage of the pedals, a slight knock has been reported at the forward end of the horizontal tie rod from the pedal shaft to the engine, owing to reversal of the direction of thrust at the moment when the reaction of the pedal pressure exceeds the thrust of the servo spring, and acts in the opposite direction. This knock is owing to slack at the forward end of the tie rod, where it is attached to the engine by a collar stud having a working clearance in the link and is subject to wear. Two schemes are under consideration for eliminating this (a) replacing the jointed link by a spring steel link which could be bolted up solid at both ends and (b) mounting the fixed pin of the servo spring on an arm carried from the pedal shaft so that the thrust would be self-contained. Rm{William Robotham - Chief Engineer}/NRC.{N. R. Chandler} | ||