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bgrah449 comments on The Correct Contrarian Cluster - Less Wrong
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Some people claim that a sailboat can move faster than the wind when reaching (moving perpendicular to the wind). When reaching, you let the sail out much farther than you would intuitively expect, until it's nearly parallel to the wind. It may be operating on lift at that point.
A jumbo jet can't take off vertically. Therefore, the thrust provided by lift from its wings is greater than the thrust provided by its engines. So perhaps a sailboat can travel faster than the wind when reaching. EDIT: No, that's wrong. You can't get more energy out than you put in.
It seems like you're equating speed with energy. Since the masses are different, couldn't the energy of the machine be less but the speed be greater?
When talking about the jet, I was talking only about force. "The masses are different" - what masses are you talking about?