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).
Vehicle cooling system performance and factors affecting overheating.

Identifier  ExFiles\Box 29\3\  Scan223
Date  9th July 1930
  
HS{Lord Ernest Hives - Chair}/Rml/MJ9.7.30 contd.

-6-

efficient fan, a rich mixture and a ventilated bonnet the
car should not over-heat at air temperatures below 35°C.
when driven all out continuously in still air, and if
driven at 75 M.P.H. indefinitely should not over-heat below
atmospheric temperatures of 40°C. Under these circumstances
we should say that the limiting factor in driving the car
fast would be the tyres and not the cooling system.

The effect of a following wind is very marked if the
fan is not working. Even when the fan is working a following
wind can easily raise the top water temperature 5°C.
We think this may account for some of the figures in the
daily reports such as that of 6.7.30.

Max. Water temp. 100°C.
Average " " 82°C.
Max. air " 28°C.
Average air " 25°C.

We will ask G.W.Hancock to specify exactly what
conditions raise the maximum water temperature 18°C. above
the average while the air temperature only rises 3°C.

Incidentally, one of the old standard whittle fan
belts is being run on 24-EX. We are sending one of the
new belts out as soon as we can obtain a fresh supply.

We think it is wrong to condemn the cooling system
of the car because the daily report shews 100°C. as having
been reached, because it may only have been attained moment-
arily without loss of water.
  
  


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