Bendix-Stromberg pressure carburetor
| Bendix-Stromberg Pressure Carburetor | |
|---|---|
 |
|
| Cut-away Bendix-Stromberg PD12-F13 from a Pratt & Whitney R-2000 radial engine | |
| Type | Bendix-Stromberg model PD12-F13 |
| National origin | United States |
| Manufacturer | Bendix |
Of the three types of carburetors used on large, high-performance aircraft engines manufactured in the United States during World War II, the Bendix-Stromberg pressure carburetor was the one most commonly found. The other two carburetor types were manufactured by Chandler Groves (later Holley Carburetor Company) and Chandler Evans Control Systems (CECO). Both of these types of carburetors had a relatively large number of internal parts, and in the case of the Holley Carburetor, there were complications in its "variable venturi" design.
A floatless pressure carburetor is a type of aircraft fuel control that provides very accurate fuel delivery, prevents ice from forming in the carburetor and prevents fuel starvation during negative "G" and inverted flight by eliminating the customary float-controlled fuel inlet valve. Unlike the float-type carburetor fuel system that relies on venturi suction to draw fuel into the engine, a pressure carburetor only uses the venturi to measure the mass airflow into the engine and manages the flow of fuel that is continuously under pressure from the fuel pump to the spray nozzle. In 1936, the first Bendix-Stromberg pressure carburetor (a model PD12-B) was installed and flown on an Allison V-1710-7.
The Bendix Corporation marketed three types of aircraft fuel systems under the Bendix-Stromberg name:
Starting with the basics of fuel combustion, no matter what type of fuel system is used on a given engine, the carburetor's sole job is to provide exactly the correct amount of finely atomized fuel into a given amount of air that is entering the engine. To be burnable, the air to fuel ratio must be within the stoichiometric range of between nine and sixteen pounds of air to one pound of fuel. Above or below this ratio, the fuel will not burn.
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