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).
Graph and table correlating road speed in MPH to engine RPM for various tyre sizes, for 'Halls Car T.T. 1935'.
| Identifier | ExFiles\Box 90a\3\ Scan166 | |
| Date | 5th September 1935 guessed | |
| Rolling Circ. & Road Speed XN62 TABLE DATA: Type | at 90 M.P.H. Measured | Rolling Circ at 90 M.P.H. A + 3 1/2 % | Road Speed at 5000 --- Buttress Special | 5.50 X 18 | 89.25 | 93. | 118.5 Special | 5.50 X 19 | 93.00 | 96.75 | 123.0 '90' | 6.00 X 19 | 96.00 | 99.75 | 127.0 Special | 6.50 X 19 | 98.00 | 101.75 | 129.0 NOTE: For 11 x 43 Axle multiply by .95 to Correct M.P.H. GRAPH LABELS: Y-Axis: Road Speed M.P.H. X-Axis: R.P.M. Title: HALLS CAR T.T. 1935. Line Identifiers: 6.50 x 19, 6.00 x 19, 5.50 x 19, 5.50 x 18 | ||