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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).
Summary of radiator test results comparing various fan, cowling, and bonnet configurations.

Identifier  ExFiles\Box 94\3\  scan0094
Date  6th September 1936 guessed
  
SUMMARY OF RADIATOR TEST RESULTS.

TEST CONDITIONS. Air temp.
Fan used. Pulley Ratio. Cowlings used. Other Details. To boil - °C.
(1) Standard fan. Std. Front and rear. Std. bonnet. (a) 40 M.P.H 21.5 (b) full speed 20.0
(2) " " Front only. " (a) 25.0 (b) 24.0
(3) " " no cowls. " (a) 23.0 (b) 24.0
(4) Copy of rigid Cad. fan. (4 blades) " " " (a) 27.5 (b) 26.0
(5) " High speed. Front and rear " (a) 36.0 (b) 23 - belt slip.
(6) Cadillac rigid fan (6 blades) Std. no cowls. " (a) 28.5 (b) 26.5
(7) " " " Std. bonnet & wire mesh grille (a) 26.0 (b) 25.0
(8) " " " No Bonnet. (a) 32.0 (b) 30.5
(9) " " front cowl STD BONNET (a) 26.5 (b) 26.0

Note :- All tests without shutters fitted.
Full speed tests approx. 88 M.P.H.
  
  


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