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).
Comparison table of specifications for P.III, 25/30, and Bentley models, including clutch data and other metrics.
| Identifier | ExFiles\Box 85\2\ scan0323 | |
| Date | 1st July 1937 | |
| 212 COPY FOR FILES. also 312, 517, 1110 JULY 1937 FOR COMPARISON P.III. 25/30. BENTLEY 13.5" 11" 10" (1) 356 190 208 (2) Clutch complete. 77 71 64 Note our relatively heavy fly-wheels. (3) 1932 1320 1368 (4) .092 .075 .080 .058 .095 .065 (5) 102 42 39 (6) 5.0 5.5 5.5 Same all types (7) Total. 39 31 35 (8) } Old 5½ (9) } New 6½ Standard. (10) O.K. same. (11) Is this considered at all critical. | ||