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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 report detailing car speed and lap times under various conditions.

Identifier  ExFiles\Box 24\5\  Scan098
Date  4th July 1925 guessed
  
CONDITION OF CAR.
98-NK. 15 X 52 2 passengers.
Wt. of car complete - no passengers - 2 tons. 7 cwts. 1 qr.

CORRECTED SPEEDOMETER.

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.
Best time for one lap: 2" 17 2/5
Equivalent speed: 72.5

Row 3:
Condition: Hood down.
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.
Best time for one lap: 2" 13
Equivalent speed: 74.89

Row 5:
Condition: Ditto ++ 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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