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).
Vehicle performance test report detailing handling, speed, and hill climb results.
| Identifier | ExFiles\Box 71\3\ scan0271 | |
| Date | 2nd September 1922 guessed | |
| - 2 - SPRINGING. Good. See spring card record for full particulars. BRAKES. Good. Foot brake inclined to squeak. STEERING. Good. Pivot lean 3/16". The firing in the silencer is fairly frequent and the exhaust boom on retard is quite noticeable. There does not appear to be any booming from any other part of the car. The Speedometer reads too high, about 15%. Its calibration is fairly good. The trouble appears to be incorrect setting of the driven pulley, which is of the Elliott adjustable type. The diameter of this pulley is 2 15/16". We find generally the correct dimension for this driven pulley is 3 1/8". The percentage of error has been carefully arrived at by dynamometer and actual road records, the latter taken by myself. The Odometer reads about 14% high. The maximum speeds on the level, taken on the straight stretch through Hilton and Tutbury on the Derby - Uttoxeter Road, with the hood up, roads dry and little wind were 73 miles per hour cutout closed and 78 miles per hour cutout open. Corrected these figures are 63.5 and 68 m.p.h. respectively. The car has been tried on Hazlewood, Quarndon, Pistern and Pastures Hills. Results as follows:- Hazlewood, minimum speed 17 m.p.h. Quarndon, minimum speed 24 1/2 m.p.h. Time from point to point 1 min. 11 secs. The previous best on Quarndon hill was 1 min. 18 secs. which was on a car fitted with 15 tooth axle. We have no records of the performance of a car fitted with a 14 tooth axle on this hill. Pistern Hill. Start 16. Rails 36. Maximum 45.5 First bend 37 Lowest 22 Time 1 min. 36 secs. Pastures Hill. Minimum speed 53 m.p.h. The following acceleration tests have been done:- 10-30. 10-40. 10-50 and 10-60.m.p.h. See chart attached. Comparisons have also been made with a standard chassis, 4-YG, loaded up to the same weight as 107-MG and shod with similar tyres (straight sided Dunlop) 4-YG is a CONTD. | ||