Thrust equates to the mass of gas being displaced during a period of time (lets say 1 cubic metre per second).

But ‘Power’ is the product of this and the velocity at which that 1 cubicmetreof gas per second, is being propelled.

For example, to displace 1 cubicmetreof gas in one second through a drinking-straw requires far more power than to displace 1 cubicmetreof gas in one second through a drain-pipe, as the velocity of gas will be far higher.

In the video below, one guy is producing perhaps 80kg of thrust, but probably only 1500W of power, because thevelocityat which the gas is beingpropelledis so slow.

[youtube]http://www.youtube.com/watch?v=g3oUkyMae0c[/youtube]

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