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).
Comparative vehicle cooling tests at Brooklands, comparing a Phantom II with five other cars.
| Identifier | WestWitteringFiles\U\August1930-November1930\ Scan024 | |
| Date | 22th April 1931 | |
| To R.{Sir Henry Royce} From Hs{Lord Ernest Hives - Chair}/MA. C. to SP.{Mr Spinney} MT. C. to AC. C. to RV. R.{Sir Henry Royce} ORIGINAL Hs{Lord Ernest Hives - Chair}/AM. T/AJ. 22. 4. 31. x788 x4012 x766 x1692 x7771 x4588 x5771 x8531 PIFTY BROOKLANDS REPORT. We have now completed the comparisons of the five cars that we compared with the Phantom ll on Brooklands. COOLING. The Phantom ll stands out as being very good on the 80 M.P.H. test when run with a ventilated bonnet. The 60 M.P.H. test naturally flatters the big car which is running at a partial throttle opening, whilst the smaller cars are practically full throttle. Thus when the Chrysler is driven all out its temperature only rises two or three degrees above the 60 M.P.H. figure, whilst the Phantom ll temperature increases by 7 - 8 °C. Again, at 60 M.P.H. from figures we have so far obtained, the 25 H.P. Rolls Royce does not show up so well as the 40/50. We think the Chrysler figures are remarkably good. From comparisons on sheet it would appear that frontal area and bonnet ventilation are responsible for this. The outstanding feature of the american cars is that with one exception (the Pierce Arrow, which showed up very badly), they fit ventilated bonnets. Also the facilities which they provide for getting air away through the under-sheets and under the dashboard are considerably better than on our 40/50 car. The Hispano would probably show up better were not the bonnet louvres the only means of escape for the air. The results indicate that we are well up in the dimensions of | ||