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).
Page 10 of a test report detailing vehicle weight, performance metrics, and tyre wear analysis.
| Identifier | ExFiles\Box 4\9\ 09-page233 | |
| Date | 28th April 1926 guessed | |
| contd :- -10- have remained in good condition. The body is free from xxxx exhaust booms. ------------ Total weight of car with cabriolet body 14 galls. of petrol, water, oil, tool kit, driver and assistant ............ 1 ton. 16 cwts. Total average speed during test ........... 35.77 m.p.h. Total average petrol consumption ........... 17.84 m.p.g. Total average oil consumption ............ 960.42 * Weather conditions during continuation of test has been cold and wet. TYRES. Dunlop cord extra heavy wired type 5 1/4" for 21" rims. Pressures - front 30 lbs. rear 40 lbs.sq.in. Average life of front tyres 8477 miles. * * * rear * 4500 miles. The tread of rear tyres quickly wears off. We do not think this type of tread wears as well as the Arrow type; they are also more noisy. G.W.Hancock. | ||