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).
Estimated weight comparison of chassis parts for models I.R.I. & 2.RT.II, detailing the savings.
| Identifier | ExFiles\Box 118\1\ scan0295 | |
| Date | 29th May 1940 guessed | |
| 1022 111-R Copy for I.R.I. & 2.RT.II files. ESTIMATED WEIGHT COMPARISON - CHASSIS. I.R.I. & 2.RT.II. Part of Chassis. I.R.I. 2.RT.II Saving. Front shocker casings. 2 off. 13.4 6.7 7.3 Steering box. 5.5 1.7 3.8 Frame 265 241 24 Engine 592 560 32 Flywheel & clutch (Corniche type)55 48.9 6.0 Prop. shaft. 1300 joints. - - 4.5 Air silencer. - - 8.0 Bumpers. - Say 5.0 Brake drums. 80 66 14.0 Rear shockers. G.A.1.½ pistons. 22.5 18 4.5 Wheels. 5 off (Rolled over rims) 115.5 93.5 22.0 Tyres 5 off. 155.0 135.0 20.0 Lucas Starter. 20.75 18.75 2.0 " Dynamo. 24.5 21.0 3.5 One coil. 3.5 2.0 1.5 Headlamps. 20.0 12.0 8.0 Petrol pump. 6.0 3.0 3.0 Petrol tank. - Say 4.0 Increase due to spring drive. - - 7.0 Larger hole in crankshaft. - Say 1 Oil filler on Rocker cover. - Say 2 Rear engine mounting - Say 3 Front " " - Say 1 Petrol filler. - Say 1.5 Tools & spares. - " 1 Rm{William Robotham - Chief Engineer}/FJH.{Fred J. Hardy - Chief Dev. Engineer} TOTAL SAVING: 176. | ||