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Divert hot air from the jet exhaust to a big hot air balloon floating high above the aeroplane. Then the jets only have to provide forward thrust, not lift.
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How big? Did you do any sums? |
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140.000kg Jetliner, 3 cubic_metres of air at 120° to lift a kg -> 420.000 cubic metres of very hot air,heated by jet turbines that are trying to drag it along... |
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Congrats,your idea just topped the size of the biggest airship ever, which had only 200.000m3 |
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Also, the plane would have to carry extra fuel to overcome
the drag from the balloon. |
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The Hullaballoon lends itself to fast, aerodynamic flight, but I think not in the range normally used by a jet engine. |
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Also, if you divert hot air from the jet exhaust to a balloon, you rob it of thrust. Also, jet engines are highly inefficient for low speed flight. |
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Perhaps generalised to 'use the waste heat from the engines to provide the hot air in a hot air dirigible' there might be more scope for this to work. |
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A hullaballoon, averaged by volume, might actually move backwards. Kind of. |
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Well, ya can't say it's not half baked. |
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This is the 'Crazy Eddie'est idea I've seen in my
short time on this site. In addition, it comes
swiftly to the point, which I like. Further, it's
pointless, which I'm coming to enjoy. |
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However, even pointlessness must have a limit,
and here, that limit been exceeded -- nay,
trashed...maybe even smithereened. |
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Kudos, hippo. Enjoy your fish. |
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[sm] a hullaballoon isn't going to move backwards, the lifting medium (H2 or He) has to be transferred from the collapsing balloonettes to the expanding ones... movement-wise it's totally an air tractor. |
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