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Analysis reveals that Y-axis centrifugal fans may lead to heavier systems compared to Z-axis fans in VTOL designs.
An analysis is presented of a VTOL power-plant system, comprising several turbojet engines used as gas generators, driving through power turbines a series of centrifugal fans disposed along a common shaft on the wing centerline. For the chosen fan pressure ratio of 2.0, it is demonstrated that a bypass ratio of about 2.0 is desirable to minimize the powerplant system weight to performa given mission; it appears, however, that the system proposed is almost 50% heavier than a comparable Z-axis fan-in-wing system.
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Cockshutt et al. (1965) studied this question.
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