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 tests and the reasoning for abandoning louvered bonnets in favour of shuttered ones.
| Identifier | ExFiles\Box 24\5\ Scan063 | |
| Date | 14th May 1925 | |
| R.R. 493a (50m) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. o2o Expl. No. REF: Hs{Lord Ernest Hives - Chair}1/LG14.5.25. The methods we have now adopted for testing the cooling will show us differences of 2 or 3% and we can repeat the results, and we are independent of air temperature conditions, windage, and the conditions of driving. The result of all our tests has proved that we must expect cars to boil under certain temperature conditions. We attach a report which shows how we compare, for instance, with the Hispano. As regards louvered bonnets, we should like to point out that these were fitted as standard for a very short time in 1912-1913, but they were abandoned because of appearance and noise, and because the shuttered bonnet is practically as efficient. Hs.{Lord Ernest Hives - Chair} | ||