h a l f b a k e r yInvented by someone French.
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1- A drone with wheels. Wouldn't be able to hold you up
once you jumped on it, but
you could recreate the scene where he throws the board
down and it hovers along for a moment before he begins
riding
it.
2- The one I favor - remotely ignited rockets that hold it
in initial hover stage
for a few seconds until you jump on
it at which time the main solid rocket motors are
triggered by switches under the feet to ignite and
provide enough thrust to support the rider.
It would by necessity be pretty thick but it's doable.
I much, much, much prefer the rocket powered model.
Yes, you could have it powered just enough to keep you
off the ground but you could also have it shoot you into
the sky where presumably you would open a parachute
that would lower you to the ground in the unlikely event
that you survived.
The advantage of the second one (screw the first one) is
that you could fly off cliffs.
Hoverboard scene.
https://www.youtube...watch?v=TkyLnWm1iCs
[doctorremulac3, Jan 08 2019]
Done with turbojets.
https://www.youtube...watch?v=DeFFrHQxQVc
Easily redoable with solid motors. [doctorremulac3, Jan 08 2019]
[link]
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If it's that light (and therefore flimsy) it will be an expensive single-use device. |
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Basically, you'll be jumping on a drone. |
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How would you modulate power output from the solid rocket motors? Without an extremely tight control loop, the thing will quickly end up upside down. |
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Shhhh. Don't tell him, just wait for him to test the prototype. |
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//How would you modulate power output
from the solid rocket motors?// |
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Not only possible naysayers... |
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basically baked. (link) The only difference is the
turbojets can be throttled to turn up the thrust
while the rider adjusts. Easily doable with variable
thrust solid rocket motors that start with lower
thrust and ramp up as more powerful propellant
further up the rocket starts burning to allow the
rider to adjust. Something
that doesn't exist because there's no call for them,
but something that's of course quite easily done. |
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Those who said this can't be done, please refrain
from engineering, designing or evaluating new
systems and technologies in the future. |
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Hypergolic bi-propellants will get you reliable,
controllable thrust. I’d go with dinitrogen
tetroxide and aerozine. Just don’t drop a socket
wrench on the thing... |
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// Something that doesn't exist because there's no call for them // |
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And you know this how, exactly ? |
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// something that's of course quite easily done. // |
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Let's get this right, before we pour the oil over the pile of faggots* ... |
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On the basis of a user between 60 and 70 kg, whose mass can vary by +/- 500g in a matter of hours depending on food and fluid intake balanced by waste elimination, you're going to manufacture solid propellant motors that can reliably - after a variable interval in storage, even in controlled humidity and temperature - ignite simultaneously within a few milliseconds, and produce an absolutely identical thrust (typically 220N) per device (working on the basis of three devices for inherent stability) which rises at an identical rate over time to another identical thrust value of 240N, causing the user to accelerate gently upwards ? |
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Have you ever personally designed, made and tested any form of solid-fuel rocket motor, using solventless nitrocellulose sticks, extruded double-base propellants, or even black powder ? Because we have, and know how difficult it is to make such a device operate with the precision this requires. |
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// Those who said this can't be done, please refrain from engineering, designing or evaluating new systems and technologies in the future. // |
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We consider ourselves rebuked ... |
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*By "faggots", we refer to thin lengths of dry wood used as kindling, rather than a dish of meatballs in rich gravy, or a slang term for a gay male. |
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I assumed, but thank you for the clarification. |
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Hey, forget about pyrotechnic reaction mass, get a bunch
of compressed air cylinders. How long does this thing
need to fly? |
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Then you've got control and it's easy to refill. So you just
shoot across the field for a few seconds, that works for
me. It would be more of a surfboard than a skateboard
but it might work. |
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Enough thrust to weight ratio juice in compressed air
tanks to lift somebody for
a few seconds and shoot them across the parking lot at 40
MPH or so? |
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What did you assume, exactly ? |
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// forget about pyrotechnic reaction mass, // |
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Oh, taking the easy way out, now ... |
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// get a bunch of compressed air cylinders. // |
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Carbon-fibre wrapped pressure vessels would be light enough, but the problem with air is that the output pressure will drop continuously as soon as the valve is opened - unless there's a restrictive regulator. |
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A dense, volatile gas in equilibrium with its liquid would be ideal; even better, eject the liquid with the pressure from the vaporizing gas. |
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Yet another method would be a container of water capable of sustaining high internal pressures, pressurized on demand by a slow-burn pyrotechnic gas generator, distributing the outflow through a manifold to ensure even thrust. |
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Then again, water is cheap, plentiful and relatively safe, so it's not the best solution; hydrocarbons would be much more spectacular. |
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//unless there's a restrictive regulator.// |
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Would you settle for a conventional mini-hovercraft? |
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