Quote:
Originally Posted by freebeard
I like the idea of a wind tunnel/water flume that has barn-door sized paddlewheels instead of propellers. If you move air/water in big blobs instead of thrashing it with a fast moving propeller there would be less turbulence.
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ummm paddle wheels are not efficient due to the vortices they create.
Its also of note that any wind tunnel worth its salt will have the propellers distanced far enough away from the test area that any vortices generated will have been disipated by the time they get there or will have been passed through a flow straightener.