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).
Number and placement of shutters on Phantom bonnets for cooling.
| Identifier | ExFiles\Box 12\7\ 07-page122 | |
| Date | 29th August 1930 | |
| W/S. C. From Hs.{Lord Ernest Hives - Chair} Hs.{Lord Ernest Hives - Chair}2/MJ.29.8.30. PHANTOM BONNETS. Replying to G11/D21.8.30. In reply to Oy's query whether we have found it possible to omit shutters in bonnets, we have not found it possible to do this, in fact, we have had to increase the shutters from two to four. Originally we had four shutters, we then reduced them to two at the rear, only we now find it necessary to have two shutters at the rear and two at the front. There are a lot of tests being carried out on cooling at present, but this represents our latest standard. Hs.{Lord Ernest Hives - Chair} | ||