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).
Blueprint detailing the specifications, gear layout, and ratios for the P3 Overdrive gearbox.
| Identifier | ExFiles\Box 94\2\ scan0173 | |
| Date | 11th February 1937 guessed | |
| P 3. OVERDRIVE. 4·050 Cts.{C. Trot Salt - Carburation} Box. 65 TEETH IN EACH PAIR OF CONTINUOUS GEARS. 36º 22' SPIRAL ANGLE 10 DP. 1ST SPIRAL PAIR ABOUT 23º 31' RATIOS. OVERDRIVE .83 2ND 1.45 1ST 2.7 REV 2.84 Diagram Labels: 1ST AND 3RD 2ND REV Gear Teeth Counts (from diagram): 31, 34 28, 37 37, 28 37, 15 21, 22 15 Dimensions & Angles (from diagram): 4·050 3·639 32º 33' Initials: GRY.{Shadwell Grylls} | ||