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).
Testing and design of a camshaft-driven brake air pump for the 40/50 chassis and 'Vulture' engine.
| Identifier | Morton\M22\ img210 | |
| Date | 4th October 1922 | |
| To Hs.{Lord Ernest Hives - Chair} from E.{Mr Elliott - Chief Engineer} c. to CJ. BRAKE AIR PUMP DRIVE HERON 'VULTURE' E1/M4.10.22. RE. TESTING AIR PUMP DRIVEN BY CAMSHAFT. X.3454, X.3850, X.3423. We send you herewith confirmation of our telegram to you of today's date, concerning the above. As you probably know we have made a design for driving the air pump from the camshaft, on the 40/50 chassis fitted with the four wheel brake scheme. We also want to know how to drive the air pump on the 'Vulture' engine. With a view to getting a preliminary test of the former and a decision for the latter, the armoured car air pump can be coupled up without slack to the front end of the camshaft on a 40/50 engine by means of fabric disc or steel disc joints. The air inlet and the delivery of the pump can be silenced by coupling up pipes to the head of the pump which can be led away where desired. It is thought that the pump torque should be nearly always in the one direction, but that there will probably be a slight kick forward at the top of the stroke due to the high pressure air left in the clearance volume. Mr. Royce would like you to find out if there is any objectionable noise from the gears on this account and he would like you to couple the pump up in 12 different positions through 60° on the camshaft, representing steps of 5°. Mr. Royce wishes me to mention that an easy way to obtain this adjustment which occurred to him, is to drill a number of holes in the coupling flanges of both the pump and the camshaft wheel, taking advantage of the fact that there are six contd:- | ||