Editing 1669: Planespotting
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*'''Dam and turbines''': Powering an aircraft with a miniature {{w|hydroelectric dam}} connected to an on-board reservoir is an absurdity. Hydroelectric plants derive power from the potential energy released by a mass of water as it falls. Because the plane is lifting the water reservoir in addition to its own weight, such a dam could never produce enough power. Ludicrously small hydroelectric power systems were previously considered in ''[[what if? (blog)|what if?]]'' "{{what if|91|Faucet Power}}". In 2008, Randall discussed the more reasonable physics problem of whether an airplane would be capable of [https://blog.xkcd.com/2008/09/09/the-goddamn-airplane-on-the-goddamn-treadmill/ flight from a treadmill]. | *'''Dam and turbines''': Powering an aircraft with a miniature {{w|hydroelectric dam}} connected to an on-board reservoir is an absurdity. Hydroelectric plants derive power from the potential energy released by a mass of water as it falls. Because the plane is lifting the water reservoir in addition to its own weight, such a dam could never produce enough power. Ludicrously small hydroelectric power systems were previously considered in ''[[what if? (blog)|what if?]]'' "{{what if|91|Faucet Power}}". In 2008, Randall discussed the more reasonable physics problem of whether an airplane would be capable of [https://blog.xkcd.com/2008/09/09/the-goddamn-airplane-on-the-goddamn-treadmill/ flight from a treadmill]. | ||
β | Only three weeks prior to this comic, [[1660: Captain Speaking]] was released only with a drawing of a plane in the air, where the captain eventually finds out that his plane is probably a Boeing | + | Only three weeks prior to this comic, [[1660: Captain Speaking]] was released only with a drawing of a plane in the air, where the captain eventually finds out that his plane is probably a Boeing. |
==Transcript== | ==Transcript== |