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).
Test report on the Wraith III engine gears for a No.6 unit experimental engine.
| Identifier | ExFiles\Box 136\1\ scan0281 | |
| Date | 3rd February 1938 | |
| To By.{R.W. Bailey - Chief Engineer} Rm{William Robotham - Chief Engineer}/CTS.{C. Trot Salt - Carburation}12/JH.3.2.38. [Handwritten: 1155 wbo 600] WRAITH III ENGINE GEARS. No.6. Unit. The above experimental engine has been run on the test bed for general development purposes, using a "fabroil" camwheel, in conjunction with "soft" gears, under the following conditions. Running time. Full throttle (varying speeds) 52 hrs. 25 mins. (not endurance) Part throttle ( " " ) 142 hrs. 20 mins. Total 194 hrs. 45 mins. When erected as a new engine, these gears were a good fit with no measureable back lash. After completing the above running time, the back-lash was found to be as follows : (a) Between the crank pinion and camwheel :- .002". (b) " " Dynamo. gear and camwheel :- .003". Brinell figure. = 366. (Drawing quotes :- 341-388). Gear Noise. Both before and after completing the above running, these gears are considered a good set. Rm{William Robotham - Chief Engineer}/CTS.{C. Trot Salt - Carburation} | ||