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).
High-speed cooling tests comparing shutters to a louvered bonnet for a sports car.
| Identifier | ExFiles\Box 24\5\ Scan144 | |
| Date | 19th September 1927 | |
| To BJ. From Hs.{Lord Ernest Hives - Chair} 4766 Hs{Lord Ernest Hives - Chair}1/LG19.9.27. With reference to BJ4/E14.9.27. X55 Our high speed tests shew that the benefit derived from opening either the front or rear shutters only is slightly more than half that derived from opening both sets of shutters. The front shutters were a little more effective than the rear, but the difference was so small that it was difficult to measure. We have not done any tests on long hills with 10-EX but we can say definitely, as a result of the information we have, that it will certainly be better cooled than the standard car under all similar conditions. We consider that the louvred bonnet will be most desirable on the sports car - (a) Because louvres are much more effective than shutters at high speeds. (b) Because permanent bonnet ventilation will be necessary to keep the driving seats cool. Hs.{Lord Ernest Hives - Chair} | ||