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).
Test results for a Napier 4-cylinder 16.9 Hp car.
| Identifier | ExFiles\Box 20\6\ Scan012 | |
| Date | 16th September 1909 | |
| R.R. 148 (20 H) (H.{Arthur M. Hanbury - Head Complaints} 360. 16.9.09) E.P. 4941. -2- 3800- x985 re Tests on Napier 4-cyl 16.9 Hp Car Results of Trial. (1) Speed for half-mile (flying start) at the beginning of the test 48-04 m.p.h. (2) Speed for half-mile (flying start) at the end of the test 46.27 m.p.h. (3) Total distance travelled in 6 hours, including hill and controls (see 8 and 9)156.998 miles. (4) Average speed for whole distance including hill and controls (see 8 and 9) 26.17 m.p.h. (5) Average speed on the test hill 12.60 m.p.h. (6) The test hill was ascended 27 times, a standing start being made on each occasion (7) Average slope of hill 1 in 5.027 (8) Total distance of controls 16.770 miles (9) Speed in control, 13.95 m.p.h. The weather was cold and damp with some rain. The temperature of the cooling water measured at the top of the radiator was 155 degs F No consumption of water was apparent. E.P. | ||