Instructions and queries for durability testing on a Wraith Dyno gearbox.
| Identifier | ExFiles\Box 8\11\ 11-page142 | |
| Date | 5th December 1938 | |
| 628 To Rm {William Robotham - Chief Engineer} /FJH. {Fred J. Hardy - Chief Dev. Engineer} from Rm {William Robotham - Chief Engineer} /Gry. {Shadwell Grylls} c. Rm. {William Robotham - Chief Engineer} c. Rm {William Robotham - Chief Engineer} /Wym. {G. Harold Whyman - Experimental Manager} (text has been struck through) Rm {William Robotham - Chief Engineer} /Gry. {Shadwell Grylls} 2/MH. {M. Huckerby} 5.12.38. WRAITH DYNO GEARBOX. (1) How much longer will 45° helix stronger 1st. motion shaft continue running. If it sticks 100 hours do a further 30 hours in 2nd. (2) After the 130 hours or when the shaft breaks fit new shaft 35° helix in either S/ZNCR or S/ZNX and standard Hoff. brg. How long will brg. then last ? (3) Repair other parts to keep going. (4) Change axle brg. when FJH. {Fred J. Hardy - Chief Dev. Engineer} wishes - now done 84 hours odd. Rm {William Robotham - Chief Engineer} /Gry. {Shadwell Grylls} | ||
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).