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).
Speedometer calibration data for a standard 20/25 chassis with 11/50 axle and 19' tyres.

Identifier  ExFiles\Box 165\4\  img261
Date  29th January 1935 guessed
  
V6051.

R.R. STANDARD 20/25 CHASSIS SPEEDOMETER CALIBRATION.

REVS PER MILE 836 11/50 AXLE 19" TYRES.

Correct revs.
140
279
419
558
700
838
978
1117.

DIAL READING. FLEX REVS PER MIN. REQUIRED AT DIAL READING. PERCENTAGE ERROR.
10 143 2% slow
20 282 1% slow
30 419 Correct
40 552 1% fast
50 685 2% fast
60 812 3% fast
70 940 4% fast
80 1060 5% fast
  
  


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