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).
Design changes for the 'Goshawk II' engine's wheelcase, gear, and fan.
| Identifier | WestWitteringFiles\G\October1921\ Scan61 | |
| Date | 1st October 1921 | |
| RECEIVED ORIGINAL To DR. from R.{Sir Henry Royce} Copy to Ed.{J. L. Edwards} HS.{Lord Ernest Hives - Chair} X.4233 X.4237 FC X4244 RE "GOSHAWK II" - WHEELCASE AND GEAR AND FAN. We send you herewith drawings Lec.1461/2 dealing with the following points:- (1) Permanent style of wheelcase to suit slipper flywheel for crankcases to be made subsequently to those that are in existence now. (2) Lubrication for the timing gears reduced in quantity. (3) Oil pressure made adjustable. (4) Alterations to fan pulley to suit slipper flywheel. (5) Fan diameter increased by 1 1/2". With regard to the crankcase, we were doubtful whether the two end bolts with the deep bosses were required for joining the top and bottom halves together, but Mr. Royce decided to use them because he would not like the possibility of an oil leak at this point. The shape of the wheelcase has been modified on the oil pump side of the engine to suit this bolting. With regard to the modified oiling of the gears, the main discharge is intended to be squirted on to the wall where it should run down the crankcase without getting on to the gears, owing to the oil bath at present existing underneath the intermediate wheel having been cancelled. The three radial holes seen in the oil discharge spout should allow enough oil to get on to the gearing. We have shewn a method of adjusting the spring pressure on the blow-off valve of the oil pump by means of packing with 2 BA. washers. A larger fan has been shewn in accordance with Mr. Royce's instructions, for the radiator, and the cowling round it should be altered to suit. The alterations to the fan pulley merely consist in moving the belt nearer to the fan on account of getting enough room for the slipper flywheel. E.{Mr Elliott - Chief Engineer} | ||