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).
Suggestions for lightening the Phantom engine by substituting materials and altering designs.
| Identifier | WestWitteringFiles\O\April1926-June1926\ Scan2 | |
| Date | 1st April 1926 | |
| TO R.{Sir Henry Royce} FROM E.{Mr Elliott - Chief Engineer} C. to - CJ " - EY " HS.{Lord Ernest Hives - Chair} ORIGINAL. re. LIGHTER PHANTOM ENGINE X8840 X8770 In addition to the modifications already specified there are a number of further suggestions for lightening the Phantom engine, not previously considered, which we would like to bring to your notice as follows:- (1) MAIN BEARING CAPS HELD UP BY STUDS INSTEAD OF BOLTS. Owing to the great depth of the crankcase this would save a fair amount of weight. Justification for using studs is that we are going to use them for holding on the cyls. and that we already use them for main bearings and Cyls. on Condor and Falcon X. Schemes could be devised for locking the studs rotationally in position. (2) ALUMINIUM WATER PUMP INSTEAD OF G.M. (3) FRONT WATER DOOR ON CYL. HEAD CARRYING IGNITION COIL AND RADIATOR CONNECTION IN ALUMINIUM INSTEAD OF G.M. (4) REAR WATER DOOR ON CYL. HEAD AS A DISHED SHEET ALUMINIUM PRESSING The dishing would be set inwards and the cover secured with suitable screws and assembled with enamel. (5) CRANKCHAMBER. In addition to the alterations already specified to this part make the scantlings the same as used on aero engine work - e.g. a general thickness of .2 instead of .250. Also reduce the width of each side web by .5" as shewn on LeC. 2229. Present width of these webs is 3.150. (6) CYL. BLOCK DOORS 4 OFF. Make these of .080" thick dished aluminium pressings instead of the present castings as shewn on LeC. 2229. (7) CYL. PLUGS. Make all plugs in cyl. head and block in aluminium. (8) MAGNETO DRIVE TUBE AND COUPLING FLANGES IN DURALUMIN. (9) USE HOLLOW STEEL OIL PUMP WHEELS. E.{Mr Elliott - Chief Engineer} | ||