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).
From 'Hs' about tests on the Goshawk Bonnet, concluding that shutters are preferable to louvres for ventilation.
| Identifier | ExFiles\Box 102\6\ scan0020 | |
| Date | 23th January 1923 | |
| BY.{R.W. Bailey - Chief Engineer} from Hs.{Lord Ernest Hives - Chair} X4241 Hs{Lord Ernest Hives - Chair}3/LG23.1.23. GOSHAWK BONNET. X4241 X4240 We have carried out tests on the Goshawk Bonnet the results of which show that if we wish to increase the efficiency of the radiator, we must ventilate the bonnet. We consider that shutters are preferable to louvres. For a short time, we used to fit louvred bonnets to the 40/50 but they were abandoned because they made the engine appear more noisy. Shutters, sufficiently large, will give the same results as louvres. Hs.{Lord Ernest Hives - Chair} | ||