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).
Data sheet detailing gear ratios for a 20/25 HP Synchro Mesh Box with different axle configurations.
| Identifier | ExFiles\Box 104\4\ scan0101 | |
| Date | 1st February 1932 | |
| Y5310 20/25 HP. SYNCHRO MESH BOX. (N.Sch.3283) FEB. 1932. GEAR RATIOS. (1) Revs. of Prop. Shaft per Rev. of Engine. 4th. Speed. 3rd. Speed. 2nd. Speed. 1st. Speed. Reverse. 1 .728 .484 .303 .310 (2) Revs. of engine per Rev. of Prop. Shaft. 4th. Speed. 3rd. Speed. 2nd. Speed. 1st. Speed. Reverse. 1 1.374 2.066 3.300 3.226 (3) Revs. of engine per Rev. of Road Wheel. (11/50 Axle). 4th. Speed. 3rd. Speed. 2nd. Speed. 1st. Speed. Reverse. 4.545 6.246 9.393 15.00 14.67 (4) Revs. of Engine per rev. of Road Wheel (12/50 Axle). 4th. Speed. 3rd. Speed. 2nd. Speed. 1st. Speed. Reverse. 4.166 5.724 8.608 13.75 13.42 A.J.Lidsey. | ||