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).
Weight-saving comparison between the Standard and Ultimate Continental Phantom III models.
| Identifier | ExFiles\Box 96\4\ scan0125 | |
| Date | 5th February 1937 | |
| Rm{William Robotham - Chief Engineer} from Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} SECRET. 358 5.2.37 Weight saving on Ultimate Continental Phantom III. Description of Parts Weights. Standard. Continental. lbs. ozs. lbs. ozs. Deletion of Auto Adjusting Tappet mechanism. 27 12 | 12 4 Port Cylinder Heads replacing 6 port. 82 12 | 75 12 Cylinder liner, reduction in sectional thickness. 39 12 | 32 12 Alum. bearings and strap rods replacing Marine and W/M Bearings. 30 0 | 26 0 Alum. Mains in place of W/M mains. 5 5 | 2 3 25/30 Dynamo replacing PH.III 30 12 | 24 10 Crankshaft, small pin with webs and weights reduced. 75 15 | 60 0 Clutch Case in magnesium in place of Alum. 10 12 | 7 4 Lower half in magnesium in place of Alum. 25 4 | 16 12 Hot Spot in Alum in place of cast iron. 13 0 | 5 0 Delete Top Water Rails. 5 4 | 1 4 --- 345 - 12 | 263 - 9 263 - 9 (struck through) --- Saving = 82 - 3 or 9% --- No Oil Cooler 4 lbs. Pacard Balance Wt. Crankshaft 17 lbs. --- 21 lbs. | ||