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).
Specification sheet detailing gearbox ratios, speeds, transmission, steering, and brake systems.
| Identifier | ExFiles\Box 97\2\ scan0095 | |
| Date | 13th July 1939 | |
| -2- RM{William Robotham - Chief Engineer}/WEC.9/JR.{Mr James Royce}13.7.39. Gearbox Axle Revolution of engine Ratio. Ratio. to 1 revolution of rear axle. Reverse gear. 2.407 4.3 10.35 1st. speed. 2.439 " 10.48 2nd. speed 1.430 " 6.15 3rd. speed Direct " 4.3 4th. speed. .836 " 3.59 The speed in kilometres per hour at 1000 revolution per minute of the engine is as follows with tyres of 6.50" x 16". Reverse = 12.9 1st. = 12.7 2nd. = 21.6 3rd. = 31 4th. = 37.1 The maximum speeds are 4 to 4 1/2 times the above, the tyres are 6.50 inches on 16 inch rims having an overall diameter of approx. 746 m.m. Transmission. The drive is taken from the gearbox to the rear axle by means of a universally jointed propeller shaft in two parts with three universal joints from which the rear axle shafts are driven through bevel gears and a bevel type differential gear, the reaction torque being taken by the rear springs of the chassis. The road wheels are detachable, and are mounted upon cylindrical hubs which are serrated in order to transmit the drive. Steering. is of the cam and roller type Turns of steering wheel from lock to lock = 2.8. Steering lock, left 41° right 41° Brakes. The car is provided with two systems of braking, the first is operated by a hand lever situated on the right hand | ||