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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.
  
  


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