RobR, "I think an endplate and fences will contribute to straighten flow by limiting the transverse flow in similar ways."
Yes they would certainly work, as would vortex generators.
The problem is that they all add drag, while decreasing the vortex drag and they do it at the expense of decreasing lift.
Lift, by definition, is a vortices. The trick is to get the lift as cheaply as possible ^^
RobR, "Another way of dealing with the same issue is to reverse sweep the wing, which if too extreme will promote transverse flow to the root (deck) of the wing."
Hmm, Hmm, Hmm, increased lift means lower pressure. We want the maximum lift in the center of the wing (or as low as possible), sucking the air inward. Increasing the camber and chord of the wing in the middle would do that. . . That is why you often see wings tapering out from the fuselage. . .
A tapered wing from the base up, with a clean boat acting like an endplate would smooth out the flow. Notice the Green Bird design is tapered now? The tail on the Greenbird design is also sitting right in the tip vortices. . .
There is a reason they put the tail up there and it wasn't to increase the weight and complexity of the wing I am sure. . .
I think you are on to something Rob, a tapered wing could also lower the Center of Effort, making it more efficient. Then it could be made lighter and cheaper. . .
Talador
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Posted by: taladorwood@yahoo.com.au
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