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).
Investigation into heavy mixture control operation on Phantom III carburetters.
| Identifier | ExFiles\Box 93\2\ scan0104 | |
| Date | 8th October 1935 | |
| x308 To Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} Copy to BY.{R.W. Bailey - Chief Engineer} Hs{Lord Ernest Hives - Chair}/GWH.{George W. Hancock - Head Chateauroux} Hs{Lord Ernest Hives - Chair}/Swindell. ----------------- E/PSN.2/MN.8.10.35. ----------------- PHANTOM III. Mixture Control on Carburetters in Vee. Complaints have been received that the mixture control is heavy to operate on the above carburetters. Hs{Lord Ernest Hives - Chair}/Swindell in looking into the possibility of using lighter main jet return springs in the carburetters found that even with the springs removed the controls on certain of the carburetters were still heavy, and the action was uneven. The unevenness in operation could be caused by inadequate back-lash between the teeth of the small pinion on the lever shaft and the rack on the main jet actuating rod. On laying out these teeth to a large scale we found that the back-lash is inadequate, and we should be pleased if BY.{R.W. Bailey - Chief Engineer} would modify the details of these two parts E 86944 and E 86945 to give a back-lash of at least .005". If the control is still too heavy when the carburetters are fitted with lighter springs which Hs{Lord Ernest Hives - Chair}/Swindell is developing, and the control with increased back-lash between the pinion and the rack, then some modification will be necessary to the control on the instrument board. E/PSN.OP. | ||