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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).
Performance test results table showing speed and lap times under different car configurations.

Identifier  ExFiles\Box 29\3\  Scan125
Date  1st July 1925 guessed
  
Top Headers: CONDITION OF CAR. | CORRECTED SPEEDOMETER.

Car Specification: 98-NK. 15 X 52 2 passengers. Wt. of car complete - no passengers - 2 tons. 7 cwts. 1 qr.

Table Data:

Row 1:
Condition: No side curtains. C.O. closed. Hood up.
Best time for one lap: 2 mins. 20
Equivalent speed: 71.15
Best speed held on most favourable straight for wind: 73
Max. speed off member banking: 74

Row 2:
Condition: Side curtains. Hood up. C.O. closed.
Best time for one lap: 2 " 17 2/5
Equivalent speed: 72.5

Row 3:
Condition: Hood down. C.O. closed.
Best time for one lap: 2 " 14 2/5
Equivalent speed: 74.13
Best speed held on most favourable straight for wind: 76.0
Max. speed off member banking: 78

Row 4:
Condition: Hood down ++ Top wind screen panel open. Spare wheel carriers off. C.O. closed.
Best time for one lap: 2 " 13
Equivalent speed: 74.89

Row 5:
Condition: Hood down ++ Top wind screen panel open. Spare wheel carriers off. C.O. open.
Best time for one lap: 2 " 10
Equivalent speed: 76.62
Best speed held on most favourable straight for wind: 78/79
Max. speed off member banking: 80/81

Note: The number of laps in conditions marked ++ were hardly sufficient to ensure that the best possible lap had been attained.

contd :-
  
  


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