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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).
Comparison of cooling performance and silting for two different diameter radiator matrix tubes.

Identifier  ExFiles\Box 15\1\  Scan157
Date  4th October 1929 guessed
  
-2-

speeds to compare the original 7-6 m.m. diam. matrix tubes with the 7-5¼ m.m. tubes. The result of these tests shewed the 7-5¼ m.m. tubes to be slightly inferior to the 7-6 m.m. tubes The average of the tests gives the following figures :-

7-5¼ m.m. dia. tubes.:- temp. increase after 6 miles at 60 m.p.h.
= 4°C.

7-6 m.m. dia. tubes.:- temp. increase after 6 miles at 60 m.p.h.
= 2½°C.

Against this must be set the fact that the 7-6 m.m. tube radiator gets silted up very much sooner than the other owing to the smaller space (only 1 m.m. as against 1¼ m.m.) between the tubes so that after considerable use the 7-5¼ m.m. matrix tubes give better cooling than the 7-6 m.m. diam. tubes.


HS{Lord Ernest Hives - Chair}/AJL.
  
  


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