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).
Speed test notes for a Napier 16.9 HP car at the Brooklands R.A.C. test.
| Identifier | ExFiles\Box 29\3\ Scan010 | |
| Date | 16th September 1909 | |
| R.R. 148 (20 H) (H.{Arthur M. Hanbury - Head Complaints} 360. 16.9.09) E.P. 4941. X1010 4200 Speed. Napier 16.9 H.P. (For particulars see Consumption record) Brooklands. (of R.A.C. test) 1/2 mile (flying start) beginning of test. 48.04 m p h.{Arthur M. Hanbury - Head Complaints} end of test. 46.27 — i.e. 156.998 miles. | ||