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[QUOTE]Originally posted by Cartmaniac: [QB] [QUOTE]False analogy. First, atmospheres introduce new variables into the situation, since you can get some rebound off of the surrounding air (or even the ground in a Harrier or hovercraft).[/QUOTE]Rebound doesn't account for more than one percent of the Harrier's total upward momentum (due to the position of the exhaust nozzles) and can be neglected. [QUOTE]Second, you're talking about a turbofan gas turbine engine, not a direct reaction engine or a rocket . . . same basic principles, to be sure, but significantly different execution than in, say, a space shuttle main engine. Ninety percent of the thrust of a turbofan engine comes not from the combustion of the fuel and air, but from the massive fan at the front of the engine nacelle which is driven by the gas turbine part of the engine.[/QUOTE]The "[i]fuck[/i]"? Dude, we're talking literally TONS of exhaust gas moving at twice the speed of SOUND here. That produces a LOT more thrust than the bypass airflow generated by the fan itself. [/QB][/QUOTE]
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