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).
Cooling and performance tests conducted on a 1927 Hispano-Suiza Coupe, comparing it to the Phantom II.
| Identifier | ExFiles\Box 29\3\ Scan243 | |
| Date | 23th July 1930 guessed | |
| HISPANO SUIZA. This car was a 1927 Coupe. As we have had a similar car at the works its general characteristics are too well known to require comment. We therefore only obtained information as to its cooling, acceleration, and maximum speed. COOLING. - Details of the radiator, bonnet, ventilation, fan etc. are appended. The HISPANO is always mentioned by connoisseurs as being a model for cool running. We therefore carried out three tests. - (1) Temperature reached driving continuously at 30 M.P.H. (2) Temperature reached driving continuously at 30 M.P.H. full throttle. This was obtained by absorbing the full power of the engine with a second car being towed and is equivalent to climbing a hill of infinite length with a gradient of 1 in 10. (3) A full throttle test similar to (2) but at 45 M.P.H. There was a considerable following wind over one portion of the track which accounts for the fact that during the 30 M.P.H. test the HISPANO boiled furiously after running five miles. The comparative tests were therefore confined to (1) and (3) in both of which it will be observed that the Phantom II shows up better than the HISPANO by an appreciable amount. The Phantom II was run with the bonnet shutters open to be comparable with the HISPANO bonnet which is heavily louvred. It is quite certain that the HISPANO engine was well up in performance, but we cannot say whether | ||