October 2011 Issue


In April’s article, “Using Ground Effect,” you gave a reasonable explanation of it. In May, reader Dave Simpson wanted to correct your “error” and wrote, “Ground effect is almost exclusively caused by reduction of induced drag” and that reducing induced drag allows “us to fly with reduced angle of attack to maintain lift when flying close to the ground.” That’s nice, but what causes reduced induced drag when in ground effect? I think that Mr. Simpson has it backward and your article was correct.

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