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 document outlining conditions for brake, restarting, fuel consumption, and rough route trials for a vehicle.
| Identifier | Morton\M5\ img026 | |
| Date | 25th August 1921 guessed | |
| 24 46 CONDITIONS OF ROYCE-CUMHA TRIAL TESTS WITH MODIFIED REAR AXLE. FORWARD AND REVERSE DIRECTIONS. 4. BRAKE TEST IN FORWARD AND REVERSE DIRECTIONS. The footbrake and handbrake will be tested separate-ly, with the vehicle loaded, on a gradient of 1 in 5, from a minimum initial speed of 5 m.p.h. Each brake will be independently tested to determine the distance in yards neces-sary to bring the vehicle to rest. The loaded vehicle will be controlled by the continuous application of one brake only for the distance of a mile at an average speed of 10 m.p.h. on an average gradient 1 in 12. 5. RESTARTING TEST. The vehicle will be expected to start from rest either in forward or reverse gear on a gradient of 1 in 5 without any external aid. 6. FUEL CONSUMPTION. The fuel consumption test will be taken from time to time at the discretion of the inspectors. Fittings must be pro-vided connecting a special gallon petrol tank. 7. TESTS ON ROUGH ROUTE. These will be conducted mainly to test the application of non-skids and their attachment, overheating of radiator, spring mounting arrangements, strength of frame and capability of chassis to stand ready use in general. The trial will include (a) This trial over a worst soft sand "dune" (app. 200 yds) long, first level & in and out of it to an end. (b) This time over an undulating road with indif-ferent surface, gradient not exceeding 1 in 10. The vehicle will be expected also to be capable of driving through wide running water not less than with a hard bottom at a speed of 4-5 m.p.h. the main to be about 2 feet deep. During the entire test there must not be change in gear ratios, ignition, carburetter, or any other detail of the armoured car or its equipment. This shall not be interpreted as preventing the making of adjustments of an insignificant nature, or of spark and throttle gear control levers. No mechanical or structural al-terations will be permitted in the vehicle during the trials, without approval. here | ||