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).
Wind tunnel equipment, oil cooler development, and radiator matrix efficiency improvements.

Identifier  ExFiles\Box 173\1\  img219
Date  6th February 1934
  
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They have decided that they cannot do wind tunnel work with anything but D.C. and have therefore installed a 64 H.P. D.C. generator. The dynamometer set-up has a 120 H.P. motor.

They spent £50,000 on the development of the Viscon oil cooler alone.

Naturally such a scale of research work is only made possible by the volume of production.

They are making over 4,000 Chevrolet radiators a day. On this production saving a cent per radiator represents 10,000 dollars a year.

RADIATOR CORES

The radiator matrices that Serckstons are now producing for us to-day are 20% less efficient than the existing standard Harrison core. The core is of the same type, but the efficiency has been stepped up in two ways:

(1) Instead of dents in the indirect cooling strips they use cut louvres. These are more effective in dissipating the stagnant layer of air than the dents, increasing the efficiency 10%. We should be able to get Serckstons to modify their tools to produce this alteration.

(2) They have increased the density of the matrix from 4 indirect fins/1" to 16 fins/1", i.e. 4

This improves matters a further 10%.
  
  


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