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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).
Page 2 of a test report detailing experiments on radiator and bonnet movement and their results.

Identifier  ExFiles\Box 11\3\  03-page379
Date  1st July 1931 guessed
  
(2)

dispensing with the unions.

(b) No controls springs for radiator.

Result.

An improvement for radiator dither and max. relative bonnet movement. The bonnet does not touch the scuttle. Although the car is not free from either complaint.

TEST VI.
(a) Bonnet Off.
(b) No controls springs for radiator.

Result.

The movement of the radiator in vertical plain is considerably worse. The radiator also knocks from movement about its mounting in a horizontal plain.

TEST V.{VIENNA}
(a) Rubbers fitted on the studs from the bottom tank of the radiator inside the cups to cover control springs so as to limit the movement of the rad. in a horizontal plain through no restraint in a vertical plain. This is to carry out similar work to that done by the spring loaded plungers on the W.W. latest scheme on 22-EX and 27-EX.
(b) Bonnet Off.

Result.

Knocking was cured from the radiator movement in a horizontal plain although this movement was not entirely eliminated. Vertical movement was not affected.

TEST VI.
(a) One tube of the V.{VIENNA} stay tube disconnected from the dash.
(b) Bonnet Off.
(c) Rubbers to locate radiator in horizontal

Result.

Radiator dither in vertical plain was eliminate

TEST VII
(a) Single central stay tube as on standard cars.
  
  


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