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Ditto on Floorboys comment. I know there must be a good answer, but I can't see how these tabs get around creating excess drag and and drag inducing turbulence . Anybody know?
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I haven't installed the ql tabs, but I did a bunch of research into the concept of an interceptor plate (which is what they are) and have installed static interceptor plates on a hull I built. From what I have read, plates are in theory more efficient than a tab because they don't have the drag associated with the surface of the tab and for the amount to projection there isn't "turbulance". If they aren't more efficient they sure aren't much less. They don't actually need to engage the water all that much and the amount of throw compared to a tab is small. On my boat the water comes off the edge nice and clean.
People sure don't ever complain about the performance and they sure are a nice clean look on a classic like the 21.