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).
Report page discussing the impact of balloon tyres on petrol consumption, featuring a graph on tyre rolling resistance.
| Identifier | ExFiles\Box 45\2\ Scan010 | |
| Date | 1st January 1927 guessed | |
| contd :- -7- between the tyre at the two inflation pressures illustrated in this test. Hence it may be said that the increase in petrol consumption due to fitting balloon tyres will not be more than 5%. This is confirmed by the results of our 10,000 miles test in France. The appended graphs arranged from figures supplied by Messrs. Dunlops shew how little is the difference in rolling resistance between a balloon and high pressure tyre when both are inflated to 40 lbs/sq.in. and that this difference accounts for less than 40 yds. in rolling to rest, over a distance of 1100 yds. (b) Decrease of rolling resistance with temperature rise. When carrying out consumption tests of any kind, care [Graph Text] ROLLING RESISTANCE OF 895 x 135 CORD TYRE SPEED - 50 M.P.H. 1. EFFECT OF TYRE TEMPERATURE 2. EFFECT OF INFLATION PRESSURE TYRE STARTED COLD 80LBS/SQ.IN. Y-AXIS: ROLLING RESISTANCE LBS WT/TN X-AXIS (LEFT): TIME - MINUTES X-AXIS (RIGHT): INFLATION PRESSURE (LBS SQ. IN.) | ||