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 log sheet detailing results for various car component configurations and adjustments.
| Identifier | ExFiles\Box 94\1\ scan0226 | |
| Date | 2nd November 1935 | |
| -3- RM{William Robotham - Chief Engineer}/Gry.{Shadwell Grylls}T/KW.2.11.35. CAR | TEST | RESULT (10) | 9 (c) except that 3rd motion shaft coupling given .008" rotational and .0020" end slack. | Slack can be felt but not heard even without any oil in the box. (11) 30-EX | New R.R. gears. All gears tight on splines, C.M. .001, 3rd speed overall .004, 2nd speed .002, direct drive .01, all at 12" radius. | No chunking (but synchro engagement sticky). (12) 30-EX | Early set of gears, large amount of slack of unknown amount, shaft end loaded, loose pinions .001 clearance endways and on diameter. | No improvement. (13) 32-EX | As sent to France C.M. .006" 3rd .004" 2nd .0035" Direct drive .0165" overall 3rd .020" measured 2nd .017" at 12" on 1st motion shaft | Better than (5) but not good enough standard (14) 30-EX | When clutch splines had .027" and axle pinion .210" backlash at 1.875" radius. | Bad chunking audible also in top gear. (15) 30-EX | Original box slack everywhere; rear wheels jacked up and chunking produced by use of hand brake - applying a brake to the 2nd speed cone. | Noticeable improvement. | ||