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).
Carburetter intake, exhaust systems, and oil radiators.
| Identifier | WestWitteringFiles\V\December1930-February1931\ Scan035 | |
| Date | 20th December 1930 | |
| -5- Hs{Lord Ernest Hives - Chair}/ACL.1/AL.20.12.30.Contd. This sleeve was connected to the carburetters intake by a vertical pipe which also continued down to the power part of the cowling forming another intake which was flush with the cowling. Two butterfly throttles were arranged, one above and another below, the branch pipe to the carburetters. These were linked together so that when one was open the other was shut and operated by a simple lever in the cockpit. By this means the carburetter air heating could be varied. With suitable manifolds it would appear possible to use the intakes of our supercharged engines in the same way and so arrange them to preserve the venturi forward intake effect. This should considerably help us in avoiding carburetter freezing, distribution, and 'cutting out' at high altitudes and probably improve consumptions. As we are frequently encountering these troubles particularly in winter, we should like to include some hot spot air intake experiments in conjunction with the exhaust manifold tests we are to carry out on the Hangar. Exhaust Systems. An interesting ejector type exhaust system was seen on several machines, particularly those using air cooled engines. This appears to act as both silencer and for reducing back pressure. I also understand it is employed on night flying bombers to blank out the light from exhaust flame which otherwise makes it difficult to operate the bomb sights. The scheme consisted of a double venturi pipe facing the air stream and round the outside of this was conducted the exhaust gas and discharged into the converging cone of the venturi through numerous small louvres. The venturi would be about two feet long and the minimum diam. of the chokes about half that of the outside diameter. Generally no extension pipe was used after the venturi. A sketch of the scheme is appended and may also be of interest in our hangar tests. Oil Radiators. Several machines are fitted with a combined radiator and tank round the nose of the machine. | ||