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).
Comparison of speed and braking tests between a Rolls-Royce 117-ME and a 30/98 Vauxhall O.E.99.
| Identifier | ExFiles\Box 47\1\ Scan208 | |
| Date | 7th December 1925 | |
| COPY OF SHEET ENCLOSED WITH St3/IN/7.12.25. Weights:- Rolls-Royce 44 cwts. unladen. Vauxhall 30 cwts. " SPEED AND BRAKING TESTS made on Sunday, November 1st, 1925, on roads between Cambridge and Thetford. Road conditions: Dry Tarmac: good surface. The speedometers of both cars were tested separately, and then together, and as far as could be judged, they corresponded exactly at 30, 40, 50 and 60 and 70 m.p.h. Acceleration from Rolls-Royce 117-ME. 30/98 Vauxhall O.E.99. standing start to 50 miles per hour 14.75 secs. 12.0 secs. 60 " " " 21.5 " 15.0 " 70 " " " 33.75 " 23.6 " 80 " " " - 34.0 " 1st, 2nd and 3rd gears used; 1st, 2nd 3rd and 4th gears used. Acceleration from running start on top gear. Rolls-Royce Vauxhall. from 10 m.p.h. to 30 m.p.h. 9.75 secs. - 40 " 14.2 " - 50 " 19.0 " - from 20 from 20 m.p.h. to 40 m.p.h. 13.0 secs. to 30 mph. 5.5 secs. 50 " 18.75 " 40 " 10.0 " 60 " 27.0 " 50 " 16.8 " BRAKING TESTS. Rolls-Royce. Vauxhall. From 60 m.p.h. 1.... 150 feet. 146 feet. 50 " ..... 94 " - " 40 " ..... 70 " 90 " 30 " ..... 40 " 21 " ABSURD Over a distance of about 2 miles, with wind and gradient favouring if anything, maximum speed recorded on speedometer | ||