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Blog post: swansont: I Wish That Physics Guy Would Stop Telling What I Can't Do

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Can we build a more efficient airplane? Not really, says physics.

 

As a plane hurtles through the air, it carves out a tube of air, much of which is deflected downwards by the wings. Throw down enough air fast enough, and you can stay afloat, just as the downwards thrust of a rocket pushes it up.
The key is that you have to throw down a lot of air (like a glider or an albatross), or throw it down really fast (like a helicopter or a hummingbird)
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