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).
Points raised about the Phantom III four carburetter induction system.
| Identifier | ExFiles\Box 93\2\ scan0099 | |
| Date | 3rd October 1935 | |
| To E.H. Copy to BY, Hs{Lord Ernest Hives - Chair}/Rm{William Robotham - Chief Engineer}, He/Swindell. x308 E/PSN.1/MN.3.10.35. ----------------------------- PHANTOM III. Four Carburetter Induction System. At a discussion yesterday morning with Hs{Lord Ernest Hives - Chair}/Rm{William Robotham - Chief Engineer} and Hs{Lord Ernest Hives - Chair}/Swindell on the above subject, the following points were raised and discussed:- 1) Rm.{William Robotham - Chief Engineer} mentioned that the reverse throttle was not satisfactory and requested that a carburetter should be made embodying the new float chamber position and the old throttle position. We pointed out that provision was made in the design of the reverse throttle carburetters for reverting to the original throttle position without serious pattern alteration to the carburetter, and it was agreed that this should be recommended to be done. The alteration to the direction of throttle opening will also involve modifications to the throttle stops and controls. 2) The question of what we were proposing to do with the filter and petrol pumps was raised. 3) It was stated that the new float chambers are much more liable to flooding than the previous ones even with floats of only .010" thick, and various suggestions were made such as counter-weighting the float, lightening the needle by drilling and reducing the size of the petrol jet. 4) The mixture control was criticised as being too heavy to operate, and Rm.{William Robotham - Chief Engineer} has agreed to do some tests to find out to what extent the spring inside the carburetter which holds the needle seating in place can be weakened. The question of an improved control on the instrument board with greater leverage was also discussed. 5) The accelerator control was criticised as being too heavy with the four springs on the carburetters, as well as for absence of toggling. Rm.{William Robotham - Chief Engineer} is going to do | ||