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).
Test report comparing the boiling temperatures of different radiator matrix types at various speeds.
| Identifier | ExFiles\Box 182\M19\ img175 | |
| Date | 20th May 1931 guessed | |
| TYPE OF RADIATOR MATRIX. Figures given Ats. Temp. at which the car will eventually boil if driven for sufficiently long under conditions specified. 30 M.P.H. 45 M.P.H. Small Hexagon Ended American Tube. Hexagon .305 across Flats Centre .255 Round No. of Dents 18. 36.5 37.5 Large Hexagon Ended American Tube. No. of Dents. 20. Hexagon .360 across Flats. Centre .309 dia. round. 33.5 34. 6.m.m. Parallel Square Tube E.81385. Figures from previous tests. 30.25 34. Square Tube E.81389. 6 m.m. Square Centre Ends expanded to 7 1/4 m.m. horizontally only, i.e. vertical waterways only. 26. 27. Present Standard. 6/7 1/4 m.m. round E.79448. 4 dents/Tube. X 21.5 X 24.5 X. these figures are lower than some we have previously attained. Tests taken on 19-TX. Conditions as in Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}1/KT.21431 All tests taken with bonnet having vertical louvres. These tests are very susceptible to the direction of the wind and are therefore not always comparable from day to day. | ||