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).
Method for testing tyre stability and cornering forces.
| Identifier | ExFiles\Box 157\1\ scan0290 | |
| Date | 1st April 1936 | |
| Technical Department. Fort Dunlop. LJL/C. 1 April 1936. Tyre Stability and Cornering. Method. Use a car which has a very big lock and mount a rotatable hook in the centre of the off-front wheel. Attach a rope or cable to this, with the hydraulic link in the centre, to a short vertical post about 30' - 40' away (the Garage concrete yard is a suitable location). Disconnect the near front wheel from the steering track rod, and fix it so that it is perfectly tangential to the turning circle. (This can be done accurately by the mirror arrangement sketched overleaf, which would also enable the slip angle A.{Mr Adams} of the off front tyre to be measured accurately). Steering forces will then be due to the off front tyre alone and can be studied by means of the recorder as the car is slowly driven round the curve. The other three tyres should not contribute any appreciable effect since they will roll in a truly circular path round the post. Any error due to centrifugal force can be measured by a blank run at the same speed with all tyres tangential. [Text from diagram] Set exactly 90° CAR Slip angle of off-front tyre Hydraulic Link Post. | ||