A ramming air inlet duct from the leading edge of the wing supplies air to the impeller, which increases pressure and temperature. However, in order to avoid detonation at the carburetor, the air supplied to the carburetor passes through the intercooler, where the temperature is reduced. The internal engine impeller, driven by the engine crankshaft, again increases air pressure at it enters the intake manifold. Higher intake manifold pressure results in greater power output.