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).
For high and low-speed radiator and bonnet comparison tests at Brooklands.

Identifier  ExFiles\Box 170\2\  img034
Date  27th April 1931 guessed
  
G.{Mr Griffiths - Chief Accountant / Mr Gnapp} Purcelyffe
RAD TESTS BROOKLANDS
High Speed Test. Rad Comparison
Compare Small Hex Tube with large Hex Tube at 60 M.P.H. all closed
" " All out *
All out Vertical Louvred Bonnet
* This speed should be checked twice

High Speed Test. Bonnet side comparison
With [text crossed out: small hexagon] Parts, obtain a figure all out & with the bonnet having three shutters / side to compare with the vertical louvres. all out

Low-Speed Test
Compare all your rads i.e. Dented Round Square E81389, Small & large Hexagonal at 30 & 45 M.P.H with Louvred Bonnet.
Repeat test with shuttered Bonnet on Small hex radiator.
  
  


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