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Originally Posted by aerohead
1) Rocketail is a fixed auxiliary-wing, high-lift device...
6) From Hucho: ' guide vane's drag exceeded any base pressure-related drag reduction. All attempts to apply the results achieved on two dimensional aerofoils to three dimensional bodies in close ground proximity have so far failed.
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Presumably due to ground effect and weather at ground level? Equally, that should not rule out positive results around ideal conditions.
Quote:
Originally Posted by aerohead
8) Rocketail adds frontal area
9) Rocketail adds its own profile drag
10) Rocketail adds its own interference drag
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But it's a matter of net cost-benefit.
Quote:
Originally Posted by aerohead
12) Injecting a high-velocity curtain of air into a horizontal avalanche of turbulence does not undo the turbulence
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No, but that doesn't mean there is no advantage in constraining turbulent flow.
Quote:
Originally Posted by aerohead
15) ...It's incumbent upon the creators of Rocketail to better explain the mechanism by which it lowers drag.
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In the academic realm that makes sense. In the commerical realm, if something works satisfactorily and sells, there may be no advantage to explaining it further. The product is SmartWay Verified for a modest benefit. A better approach would be to look at the EPA verification method and diligence.