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).
Speedometer and performance test results for car 49-GB at the Brooklands racetrack.
| Identifier | ExFiles\Box 29\3\ Scan073 | |
| Date | 1st June 1920 | |
| TESTS CARRIED OUT AT BROOKLANDS 49-GB CAR First check Speedometer at - 30 M.P.H. - 45 M.P.H. - 60 M.P.H. Test 1. Condition - Hood and Windscreen up - cut-out closed. High compression pistons - Low geared axle - No wind. Lap 1. Time: 2 mins. 28 sec. Speedometer min: 71 Speedometer max: against stop. Lap 2. Time: 2 - 28 Speedometer min: 70 Speedometer max: against stop. Lap 3. Time: 2 - 28 Speedometer min: 72 Speedometer max: against stop. ½ mile flying. Time: 26 secs. Speedometer: against stop. ½ mile from 10 M.P.H. Time: 42.2 secs. Speedometer: 69 M.P.H. Test 2. Condition. Hood down - windscreen up - cutout closed. Lap 1. Time: 2 min. 30.5 s. Speedometer min: 71½ Speedometer max: against stop. Lap 2. Time: 2 m.{Mr Moon / Mr Moore} 30.5 s. Speedometer min: 72 Speedometer max: against stop. Lap 3. Time: 2 m.{Mr Moon / Mr Moore} 30.5 Speedometer min: 72 Speedometer max: against stop. ½ mile flying. Time: 26.2 secs. Speedometer: Against stop. ½ mile from 10 M.P.H. Time: 42.2 secs. Speedometer: 70 M.P.H. Test 3. Condition. Hood down - windscreen down - cut-out closed. Lap 1. Time: 2 m.{Mr Moon / Mr Moore} 25 secs. Speedometer min: 72 Speedometer max: at stop. Lap 2. Time: 2 m.{Mr Moon / Mr Moore} 23 secs. Speedometer min: 71 Speedometer max: at stop. Lap 3. Time: 2 m.{Mr Moon / Mr Moore} 22 s. Speedometer min: 72 Speedometer max: at stop. | ||