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).
Examination of Stromberg and Claudel carburettor designs, focusing on fuel levels and float chamber arrangements for aircraft engines.
| Identifier | ExFiles\Box 42\3\ Scan068 | |
| Date | 31th December 1926 guessed | |
| contd :- -3- level in the diffuser tube would vary with a 'plane in different positions. Examining the Stromberg carburetter as used on the Curtiss engine, we find they employ a level as high as .187" below the spray holes with a 72" head. Due to the arrangement of the float chamber and floats this high level is possible without danger of flooding even when the carb. is inclined at a large angle. Also in all normal positions of the 'plane, where power is demanded from the engine, the petrol supply to the diffuser tube would appear to be quite normal. It will be remembered that this carburetter has a small float chamber fore and aft of the diffuser jets, each containing a cylindrical metal float coupled together to the same fuel valve. A sketch is appended of the arrangement. Considering the high level employed in the Stromberg and the resulting necessity of employing a float chamber fore and aft of the diffusers to make this level safe and avoid variation of fuel level during air manoeuvres, it would appear that they have good reasons for adopting this high level and provision for keeping it as constant as possible. It is pointed out in the Curtiss and Stromberg Handbooks that the carburetter is arranged to give good carburation during violent manoeuvres the change from the old type being in the design of the float chambers. Again in the Claudel carburetters made for the Vee, we find what we think is an attempt to produce the same conditions as above but in a somewhat different way: The main diffuser contd :- | ||