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).
Servo and brake system faults, specifically a bending overhanging shaft and sponginess in the brakes.
| Identifier | ExFiles\Box 1\4\ B001_X 100a-page114 | |
| Date | 5th December 1932 | |
| 84057. To Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} From G.W.H. Hotel de France, Chateauroux, FRANCE. 5.12.32. Z.PER.II. SERVO. We should once more like to emphasise the fact that the servo overhanging shaft is bent 1/8" when a full load is applied on the servo. This makes it impossible for the surfaces of the servo to come on squarely. Whether there is 1/2" diameter clearance for the three pegs, it would make no difference. The whole servo binds up. This is the chief reason why the back plate never shows it having done the same amount of work as the front plate. The springiness of the anchor plate allows the force to be applied to the front plate more so than the rear plate, with the servo operating normally without undue pressure. We are trying to overcome this fault by strengthening up the bridge piece, also by fitting a supporting bracket to the overhanging shaft of the servo. The outcome of our investigation work of the whole system of brakes, it that we attribute the sponginess to :- (1) winding up of the rear brake toggle shafts, springiness of the drum; etc. (2) The bending of the overhanging servo shaft. With these parts remedied, and a larger servo, we feel sure that good braking would be the outcome. G.H.Hancock. G.W.H. | ||