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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).
Tests concerning radiator and bonnet movement, clearance, and noise prevention.

Identifier  ExFiles\Box 119\2\  scan0345
Date  6th June 1930 guessed
  
III

to the frame is rather excessive, although very little relative to the front of the bonnet. That is the radiator follows the front of the bonnet. In consequence there is no detrimental noise from the front of the bonnet. The rear of the bonnet just takes up its .125" clearance and an occasional tap is heard, this being a large improvement on the previous test.

From these two tests it is quite evident the vast improvement to both the radiator and bonnet movement from a centre mounted radiator. In Test II we feel the radiator and bonnet would be satisfactory to a customer on the road. In order to locate the radiator from the bonnet it is important to have no clearance between the bonnet and radiator. Provided this is so you can push the radiator from any direction without moving it when the bonnet is shut. If however the radiator is pushed over whilst the bonnet is open, difficulty is found in closing the bonnet. If the bonnet clips are fastened, when the front of the bonnet overlaps the radiator as it does when the radiator is push over before closing, the bonnet will go back into position on the first bump.

In our further tests the radiator is not located from the bonnet and we found we need .025" clearance between them to prevent noise from the front of the bonnet.

Test III. Scheme 1529. These parts were sent to France to be used on 25EX.

We find these rubbers, intended to locate the
  
  


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