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faction you are mixing fixed values for conditions with impossible theories, stop the values and come up with some of these theories 'Now I put some clever-engine technology on my aircraft, meaning the wheels can drive it up to oh, 180 knots. My clever engine-technology also means I can cut the jets in at 100% thrust in an instant.'
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OK, that's just a daft way to illustrate the point that regardless of where propulsion comes from, you do need some to get the air moving over the wing before it works and you break ground.
You have to take constant atmospheric conditions (even if you used realistic constants, qnh29.92. 20 degrees. calm wind (these conditions do happen you know), as there's a) no information of these conditions in the question b) they ARE exceedingly relevant for flight (specifically the operation of a conventional-wing), c) there's no frame of reference to use for the question (I've never seen a real-life try-out of this with a 747 on a conveyor-belt/rolling-road), so you need to be able to compare _somehow_, and to do that with any hope of reliability, you need to consider those values.
Still, I think the winged-Veyron is quite a basic, plausible, and simple to understand illustration of the point...
Regards,
Rob.