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).
Summary of results from Phantom III Gearbox Dynamometer Testing.
| Identifier | ExFiles\Box 94\2\ scan0258 | |
| Date | 2nd July 1937 | |
| E.{Mr Elliott - Chief Engineer} from Rm{William Robotham - Chief Engineer}/Gry.{Shadwell Grylls} o.Sg.{Arthur F. Sidgreaves - MD} o.Hs.{Lord Ernest Hives - Chair} o.Da.{Bernard Day - Chassis Design} o.Hdy.{William Hardy} o.By. 326 Rm{William Robotham - Chief Engineer}/Gry{Shadwell Grylls}1/R.2.7.37. P.III GEARBOX DYNAMOMETER TESTING. Since our Rm{William Robotham - Chief Engineer}4/R.8.1.37., we have done a considerable amount of full torque running, and give here-with the results:- (1) Soft splined S/ZNCR gears ran 10 hours in 2nd and 3rd speeds, followed by 6,000 miles road running in England, and have not developed slack on the shafts. (2) Constant mesh gears were fitted to a box to give an overdrive ratio with standard 3rd speed gears of .82 (R.R. type). After 68 hours the bronze bushes had worn to such an extent that the gear would not stay in mesh. After 83 hours the thread at the front end of the 2nd motion shaft failed. S/ZN bushes ran 82 hours with very little wear. The C.M. and 3rd speed gears ran 150 hours without failure. (3) General Development Box - 4 HS.{Lord Ernest Hives - Chair} The strengthened side shaft has run 60 hours on 2nd speed, and a total of 159 hours running on indirect gears. Gears made in Ford Cyanide hardened steel ran 20 hrs. on 2nd, after which the C/M driven gear teeth failed (these were R.R. type). R.R. 2nd speed gears failed due to tooth breakage after 36 hours. N.sch.4902 2nd speed after 30 hours had cracks in radii of driving slots in outer of the three parts. | ||