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).
Specifications for a new small chassis design, including details on the gearbox, back axle, and suspension.
| Identifier | ExFiles\Box 5\3\ 03-page009 | |
| Date | 17th November 1920 | |
| X4217 To C.J. from R.{Sir Henry Royce} R4/B17.11.20. X.4219. RE SMALL R.R. CHASSIS. X.4247. Three speed gear box carried on rear of engine. (Gear box will be similar to Goshawk, but modified for three speeds). X.4252. Central change gear and brake levers. X.4254/7. The back axle to be generally of the "Goshawk" type but lighter and simpler. It will have - X.4255. (a) Central gearbox of cast aluminium split longitudinal, as on "Goshawk". (b) Taper steel axle tubes of rather small diameter. (c) The rod underneath. (d) Double rear brakes. (e) Fabric disc couplings at each end of propeller shaft drive from change speed gear box. (f) Parallel control by semi-elliptic rear springs, the springs to be very long for the purpose of obtaining stiff spring leaves which will carry the brake torque and propulsive torque of the axle. x4262 | ||