Take Charge - Engine Supercharging
Externally, a twin-screw supercharger looks much like the common Roots design, but the difference ends there. On this twin-screw Whipple supercharger, air enters the engine at the rear instead of the top. These units are a variation on the positive-displacement configuration. After the air enters the twin-screw supercharger through the rear or top rear, it is compressed internally between screwlike rotors.
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