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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).
Table detailing test results for various units, including running times, mileage, and backlash measurements.

Identifier  ExFiles\Box 107\2\  scan0164
Date  29th June 1926
  
UNIT NO. | RUNNING TIME HOURS ON TEST BED MILES ON CHASSIS. | WITH OR WITHOUT BALANCING CAM. | MOULDED OR SHEET FABROIL. | HELIX ANGLE. | APPROX. ORIGINAL BACKLASH. | APPROX. FINAL BACKLASH.
1 | 150 hrs. at 1000 r.p.m. 7,000 miles in France (20.6.VI) | With | Sheet | 32° | 0.0 | 0.009
2 | 190 hrs. with 68 hrs. between 4000-4500 r.p.m. 1,700 miles (24.6.VI) | 30 hrs. without | Sheet | 32° | 0.0 | 0.007-0.015
3 | 11,000 miles (24.6.VI) | With | Sheet | 32° | 0.0 | 0.004
4 | 6,320 miles (27.6.VI) | With | Sheet | 32° | 0.0 | 0.003
5 | 7,040 miles including prolonged high speeds to break distributors (28.6.VI) | With | Sheet | 41° | 0.0 | 0.008
6 | 192 hrs. general development not above 4000 r.p.m. 2,000 miles (27.6.VI) | 40hrs. without. | Sheet | 41° | 0.0 | 0.003
7 | 21,000 miles (26.6.VI) | Without | Moulded | 41° | 0.0 | 0.012-0.01
8 | Negligible running (25.6.VI) | Without | Moulded | 41° | 0.002 | Now in sg{Arthur F. Sidgreaves - MD} car.
9 | 3,300 miles (29.6.VI) | Without | Moulded | 41° | 0.0 | 0.002
  
  


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