They have a similar steep blade angle similar to the skythe slipstreams which is good for open air case type applications, but not so much when on a radiator.
It looks like it has fairly low static pressure for that high of an RPM. Only about .119" H20, where as the Skythe Ultra Kaze has nearly double that amount for the same RPM.
Static pressure is what really helps on a radiator especially the more dense radiator types.
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