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, gearing, and fan.
| Identifier | ExFiles\Box 75\3\ scan0168 | |
| Date | 13th October 1921 | |
| To Da.{Bernard Day - Chassis Design} from R.{Sir Henry Royce} c. to Wor.{Arthur Wormald - General Works Manager} c. to Hs.{Lord Ernest Hives - Chair} c. to BY.{R.W. Bailey - Chief Engineer} H.R. 288A (100 C.S. Bks 10/33) G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 2047 X4237 E6/G13.10.21. X.4233 X.4237 - RE GOSHAWK 11. WHEELCASE AND GEAR AND FAN. X.4244 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 thr 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 dicharge 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 underneathe the intermediate wheel having been cancelled. The three radial hdes 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 contd:- | ||