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).
Comprehensive specification for the Silver Wraith 30.G.VII/1, detailing the gearbox, axle, and brake systems.
| Identifier | ExFiles\Box 109\4\ scan0009 | |
| Date | 27th October 1938 | |
| 666 To HPS.{Horace Percy Smith - Experimental Factory Mgr} from Rm{William Robotham - Chief Engineer}/Cr.{Mr Cra???ster / Mr Chichester} c. By.{R.W. Bailey - Chief Engineer} c. Da.{Bernard Day - Chassis Design} c. By/NS.{Norman Scott} c. By/CHL. c. By/HEB.{H. Biraben} c. By/CS. c. By/RD. SPECIFICATION SILVER WRAITH 30.G.VII/1. Herewith a comprehensive specification for 30.G.VII. Gearbox. Standard ratios and small synchromesh cone to PD.239. See memo By/CHL.2/4.7.9.38. Op. forks Ex.32786. Rear Axle. Semi-floating rear axle. 9/37 differential gear ratios. Timken bearings. 45 mm half shafts in S.A.E.4140. Aluminium bronze diff. washers. Magnesium centre casing if available. Prop. Shaft. To suit length of frame. Brakes. Front brakes PD.264 (Two shoe brakes). Master Cylinder SCD.981. Temporary scheme not issued yet. Piping. To be installed by Lockheed engineer on first car. A fortnight's notice is required. Servo. PD.211. (Use old cams). Servo balancer. PD.212. Servo drive. PD.222 with whole bronze wheel. (A simplified servo is intended to replace PD.211/2 and SCD.981 for production). Rear brakes. PD.125 and PD.262 for semi-floating axle. Rear brake adjuster. OCD.770 and PD.274. Rear brake equaliser and Intershaft. OCD.897 (use old lever). Rear Rods. EXS.892/3/4/5. | ||