Rolls-Royce Archives
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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 graph for a 20/25 HP engine showing BHP and temperatures against RPM, with and without a fan.

Identifier  ExFiles\Box 25\1\  Scan029
Date  5th September 1932
  
STRICTLY CONFIDENTIAL
TAKEN FROM
T.C. N° 1192
ROLLS 20/25 H.P. ENGINE
6 BLADE FAN INCLUDED ANGLE 34°
RATIO 1.35 TO 1 UP
B.H.P.
ENGINE R.P.M.
B.H.P. WITHOUT FAN.
B.H.P. WITH FAN
BOIL VALUE 3 LBS/sq.in (AIR IN 100°F)
T.D. WATER
T.D. OIL
TEMPERATURE DIFFERENCE (°F)
Lbs/sq.in
  
  


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