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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).
Test results for the 40/50 HP cooling system efficiency at various speeds, configurations, and mixture strengths.

Identifier  ExFiles\Box 24\4\  Scan307
Date  23th December 1924 guessed
  
INCREASE IN EFFICIENCY OF 40/50 HP.
COOLING SYSTEM WITH SPEED.
SHEET 4.

20 1/2" matrix.
Road speed.
δt
% difference from 'A'.
Critical atmospheric temperature.

20 M.P.H. - all closed.
82.2°C
'A'
11.8°C

30 M.P.H. - " "
77°C
7.5% better.
18°C

40 M.P.H. - " "
71.6°C
14% better
23.4°C

40/50 HP. WITH 22 1/4" MATRIX AND LARGE SHUTTERS OPEN COMPARED WITH STD. HISPANO CONDITION 30 MPH.

Car and Ventilation details.
δt
% difference from 'A'
Critical atmospheric temperature.

40/50 HP. 22 1/4" Matrix. 4 large shutters. Total area 112 sq.in.
62°C
'A'
33°C

Hispano - louvres.
60.7°C
2.1% better.
34.3°C

AFFECT OF MIXTURE STRENGTH - HISPANO - 30 M.P.H.

Std. rad. conditions. Mixture control.
δt
% difference from 'A'.
Critical ats: temperature.

Strong mixture.
58°C
'A'
37°C

Weak mixture.
63.4°C
9.3% worse.
31.6°C

Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}
  
  


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