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 overheating, discussing factors such as fan efficiency, ambient temperature, and the cooling system's performance.

Identifier  ExFiles\Box 24\5\  Scan263
Date  9th July 1930
  
-6- Hs{Lord Ernest Hives - Chair}/Rml/MJ9.7.30 contd.

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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