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. | ||