Rolls-Royce Archives
         « Prev  Box Series  Next »        

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 chart comparing road wheel brake horsepower against engine RPM for various car configurations, with a table of lap speeds from Brooklands.

Identifier  Morton\M7\  img050
Date  1st November 1925
  
BROOKLANDS NOV. 1925

TABLE:
CONDITION OF CAR | LAP SPEED MILE | HALF MILE
High Compn. Sports Car 17 Tooth Axle | 79.2 | 80.4
Standard Condition C.O. Closed |
Standard Condition C.O. Open | 80.5 | 82.6
Standard Touring Car 4 - 1 Comprn 15 Tooth Axle |
Standard Condition C.O. Closed | 74.13 |
Sports Car Front Wings Removed Top Panel of Wind Screen Raised C.O. Open | 87.8 | 89.6

CHART:
Axis Y: ROAD WHEEL B.H.P (30, 40, 50, 60, 70, 80, 90)
Axis X: ENGINE R.P.M. (500, 1000, 1500, 2000, 2500, 3000)

Chart Annotations:
C.O. OPEN
C.O. CLOSED
Standard Car Comp. Ratio 4.1 - 1
High Compression 5.2 - 1
2750 R.P.M. 89 M.P.H 17x52 AXLE
  
  


Copyright Sustain 2025, All Rights Reserved.    whatever is rightly done, however humble, is noble
An unhandled error has occurred. Reload 🗙