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 | ||
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).