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A centrifugal supercharger is a specialized type of supercharger that makes use of centrifugal force in order to increase the manifold air pressure, MAP. An increased MAP allows the engine to burn more fuel, which results in an increased power output.
Pratt & Whitney developed the R-985 Wasp Junior as a smaller version of the R-1340 Wasp to compete in the market for medium-sized aircraft engines. Like its larger brother, the Wasp Junior was an air-cooled, nine-cylinder radial, with its power boosted by a gear-driven single-speed centrifugal type supercharger.
The centrifugal type supercharger was designed as a removable module and could be installed on other versions of the M-34. Rated at 820 PS (810 hp; 600 kW). A PTK steam-powered supercharger was developed and tested from 1938 to 1940, but was not accepted for production. M-34RN
The AM-35 also used a single-speed supercharger instead of the two-speed supercharger specified. In order to obtain higher performance a new version the AM-35A was designed with greater supercharger output and this was produced in large numbers at Factory No. 24 until the end of 1941 when the factory was evacuated to Kuybyshev. Although ...
Supercharger: Centrifugal-type, single-stage, 8.1:1 gear ratio, 15-vane, 10.25 in (260 mm) diameter impeller, and General Electric turbo-supercharger with intercooler Fuel system: 1 x Stromberg PD-12K8 2-barrel injection [ clarification needed ] downdraught carburetor with automatic mixture control
The engine continued to use a single-stage, single-speed centrifugal supercharger and therefore lacked the all-altitude performance of German and British designs. But swapping the mediocre HS No.1 supercharger for the larger Szydlowsky-Planiol supercharger tuned for a higher critical altitude improved high-altitude performance considerably ...