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).
Performance review and comparison of a vehicle's steering, braking, and road performance against a competitor, the Wizard 75.
| Identifier | ExFiles\Box 128\1\ scan0124 | |
| Date | 31th October 1931 | |
| -8- portion of pedal movement engages the clutch and consequently care has to be exercised in using it. The steering is the best feature of the car and is remarkably good. It is exceptionally light, absolutely immune from road shocks and joggles, self centres well and is selective; the only criticisms are that it is slightly too low geared and the steering wheel diameter is rather small. The brakes are Duo-servo type mechanically operated, they are effective and silent but suffer from the complaint common to all self-servo'ing brakes, viz: the equalisation is bad and brake application causes the car to deviate from the straight course. The springing is fairly soft, and would be very good if it were not spoiled by pitching. There is no justification (if the car tested is a sample of all Wizards) for the opinion we have heard circulated that the riding comfort of a Wizard is superior to our own product. Road holding and cornering are very good. Road Performance. The maximum speed attained on a flat road was 64 M.P.H. by speedometer, which we should estimate to be equivalent to a true 60 M.P.H. Acceleration up to 50 M.P.H. is quite good, from 55 M.P.H. upwards is slow. The car was taken over our standard 25 HP. performance test route with the following results:- Stanton Hill. Wizard 75. R.R.25HP.(weight 31 cwt) Speed at finish: 25 m.p.h. 29 m.p.h. Time: 27 secs. - Ticknall Hill. Speed at finish: 47 m.p.h. Time: 71 secs 67 secs. Pistern Hill. Min. speed on hill: 18 m.p.h. - Speed at finish: 30 m.p.h. Time: 73 secs 66 secs. | ||