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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).
Test results for car 49-GB at Brooklands, including lap times, speedometer accuracy, and acceleration.

Identifier  ExFiles\Box 29\3\  Scan077
Date  3rd June 1920
  
TESTS CARRIED OUT AT BROOKLANDS
WITH 49-GB CAR.

3.6.20

Test 12. Condition. - Hood down - screen down - cut-out closed. open

Lap 1.
Time. 2 m.18 1/2 sec.
Speedometer, min. max. at stop.

Lap 2.
Time. 2 m.18 sec.
Speedometer, min. max. at stop.

Lap 3.
Time. 2 m.17 sec.
Speedometer, min. max. at stop.

1/4 mile flying.
Time. 24 1/2 secs.
Speedometer. at stop.

1/4 mile from 10 M.P.H.
Time. 40 secs.
Speedometer. at stop.

Speedometer tests. 1.6.20.
Spmter. Readings. | Distance. | Time in secs.
30 M.P.H. | 1/4 mile | 62
45 " | 1/4 " | 44
60 " | 1/4 " | 35

Acceleration Tests.
Hood up - screen up - cutout closed
No Wind.
Speed. | Time taken in secs.
10 to 20 M.P.H. | 4
10 to 30 " | 7.5
10 to 40 " | 12
10 to 50 " | 18
10 to 60 " | 24
1/4 mile from 10 M.P.H. 40.6 secs.

Acceleration Tests. 2-6-20.
Hood up and screen up - cutout open.
Speeds. | Time in secs.
10 to 20 M.P.H. | 3
10 to 30 " | 7
10 to 40 " | 11
10 to 50 " | 15
- 10 to 60 M.P.H. 21 secs.
  
  


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