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).
Deflation tests performed on large tyres.
| Identifier | ExFiles\Box 42\1\ Scan093 | |
| Date | 17th October 1927 | |
| COPY. Messrs. Dunlop, Test House, Fort Dunlop. 17th. Oct. 1927. DEFLATION TESTS ON LARGE TYRES. (1) A 33 X 6.75 balloon tyre was fitted to a 5 X 21 w.b. rim on an E2. wire wheel using standard rim tape, and inflated to 40 lbs/sq.in. The wheel was then fitted to the O.B. hub of Sunbeam 'B'. A deflator cap was fitted and the car attained a speed of 50 m.p.h. when the tyre became flat. As the tyre became quite deflated, the speed dropped to 40 m.p.h. At this speed a 3 mile give and take course was followed. After 3 miles, the tyre was in ribbons, the tube was bunched up inside the cover but this was still on its rim. The car was stopped and re-started twice without the cover leaving the rim. (2) The test was repeated using a 6" for 21" medium pressure tyre, with similar results. ----------- | ||