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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).
Engine cooling systems, body design, and spare wheel stowage.

Identifier  ExFiles\Box 24\1\  Scan051
Date  12th December 1931 guessed
  
17.

allowing the clean warm air to escape into it by means of controlled louvres.

3. The engine fan scavenges the engine compartment and keeps the system cool when the car is idling or in traffic.

4. The oil radiator can be mounted alongside the rear radiator and thus utilises the same fan.

5. The rear portion of the body of the car is freed from all louvres and the appearance enhanced in consequence.

6. The system is equally suitable for an open touring or racing car as for the saloon type.

7. The weight compares favourably with any other system so far tried.

The disadvantage is the cost of the two long pipes which have to traverse the length of the car, and it has been suggested that these pipes are more susceptible to freezing if the car is left standing in cold weather. I cannot see any reason for this suggestion, and it may be that the point will be referred to during the discussion.

I now come to the question of appearance and I cannot do better than to refer to the series of cars we have constructed and give the reasons for the various changes.

In the No.1 car the shape of the front was controlled by having to make provision for the spare wheel. As can be seen the result was not happy.

The spare wheel stowage has been a very difficult problem, as the places used on orthodox cars are not allowable. The rear position cannot be used as the engine heat is discharged at that point, and if the streamline ideal is to be retained the side position behind the front wing is also taboo.

The position selected in the Rumpler car has the disadvantage of raising the floor level several inches, as in this car it is placed in the frame, see Fig...... Without increasing the wheel base solely for the spare tyres, there
  
  


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