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Axial fans can provide high flow and high boost, but not at low cost. They work well on jet aircraft, although the inefficiency is such that small aircraft tap off a bit of compressed air and re-expand it for cabin heat.
Having an extra restriction in the intake is irrelevant if it just takes some of the load off the throttle plate.
I'd like to see a proper device, either axial-flow or positive-displacement that would work as a supercharger occasionally, but as a throttle plate that generates power most of the time. However, messing with intake pressure makes variable compression even more desireable.
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