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China’s ‘land aircraft carrier’ charges flying drone with microwave beam (www.scmp.com)
submitted 6 months ago by to c/technology@lemmy.world
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Scientists in China have demonstrated a wireless power transmission system that uses a ground-based microwave emitter to beam energy to an antenna array mounted on the aircraft’s underside. Importantly, they were able to do this while both the drone and charging system were in motion.

In tests, the car-mounted system kept fixed-wing drones in the air for up to 3.1 hours at an altitude of 15 metres (49 feet). The key challenge that the team overcame was maintaining alignment between the emitter and the drone during flight, wrote Song Liwei, the project’s leader.

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[–] -2 points 6 months ago* (6 children)

You can have solar panels and batteries on the ground, and use them to charge the microwave emitter, which can then charge the aircraft, which now does not need to carry solar panels and as much batteries, and thus has increased payload / range.

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  • [–] 0 points 6 months ago (4 children)

    The microwave receiver will not be small or efficient

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  • [–] 1 point 6 months ago* (last edited 6 months ago) (3 children)

    Oh, ok.

    Even though this entire post is... about how it is small enough to fit on a drone, and efficient enough to power it for 3 hours.

    Ok.

    Gotcha.

    I'm not sure if you're aware of this, but densely packed explosive bombs and missiles and warheads tend to be pretty heavy.

    ... the entire problem with purely onboard solar powered vehicles of any kind is that they have to be absurdly lightweight, flimsy.

    That isn't practical.

    It might be purely efficient, in a sense, but it isn't very useful.

    Being able to actually move stuff, that is practical.

    Most transportation modes involve the ability to haul stuff.

    You know, do work, aka the capacity to make stuff move.

    You picking a fight that makes no sense to pick.

    You can have solar and batteries be more stationary, and use microwaves to power things that are more mobile, this post is literally the proof of that concept... you can charge a battery with a any kind of power source.

    Look heres another massive potential application of this, if you science fiction extend the accuracy/capability of this:

    Plop a bunch of solar panels/batteries in the L1 point between the Earth and the sun.

    Now, via a set of satellites in something like concentric orbits, you can get absurd amounts of power, beam it back along chains of satellites, snd then beam it to recieving stations on Earth. Or the Moon. Or orbital infrastructure.

    Microwave transmission power loss will be waaaay less in space, because there's no atmosphere.

    Same with solar panel efficiency!

    Solar Power + Microwave Transmission = Very Good, Actually.

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  • [–] 2 points 6 months ago* (2 children)

    The only two metrics that matter here are W/m^2 and weight.

    You can't make a reasonable microwave receiver lighter than solar film and efficiency peaks around 50% in FIXED installations and you can easily assume less than a quarter (under 10%) when the target isn't just moving, but is also changing angles and distance (you'd have to put the receiver on a gimbal like for cameras) and now it's also interfering with flight (propeller airflow, unless you do weird propeller geometries or tilted body flight

    Tldr DUMB

    Microwave power transfer only make sense between distant fixed line of sight locations with minimal infrastructure available. On earth that's literally just island mountain tops. Even then it's easier and cheaper to still just install solar

    On the moon, it would basically just mean you have one big generator and everything gets powered by the sun when in sunlight and switch to microwave from the generator when in shadow, which is pretty much the only configuration that even make sense

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  • [–] 1 point 6 months ago (1 child)

    You can't make a reasonable microwave receiver lighter than solar film and efficiency peaks around 50% in FIXED installations

    https://www.sciencedirect.com/topics/engineering/microwave-power-transmission

    In JPL 30 kW power was transmitted for 1.54 km with reception conversion array having an efficiency of 80%

    That was 8 years ago.

    What I'm describing are... currently extremely active areas of research.

    Microwave power transfer has been used for many applications since its inception by Maxwell. Wireless charging of EVs and UAV using microwave power are some of the widely researched examples.

    you can easily assume less than a quarter (under 10%) when the target isn't just moving, but is also changing angles and distance (you'd have to put the receiver on a gimbal like for cameras)

    You should maybe look into the level of precision that things like Phalanx CIWS systems have at tracking a moving target, with the ability to throw bullets at it, and hit it.

    Or basically any SPAAG type platform that throws rounds down range.

    Or I dunno, MASERs used in deep space transmission.

    Or all the research that has gone into developing tracking gimbal systems that do intentionally use lasers or some kind of DEW to shoot down small drones, or damage aircraft in flight, or burn out incoming missiles.

    Hell of a lot easier to track a friendly aircraft.

    and now it's also interfering with flight (propeller airflow, unless you do weird propeller geometries or tilted body flight

    Genuinely no clue what you are talking about.

    Are you assuming only like, quadcopters here?

    We've had RQ 4 drone aircraft the size of WW2 medium bomber planes, with jet engines, for 20 years now.

    I'm fairly sure that a jet engine produces a considerable amount of consistent heat.

    Do... you think aircraft engineers... do not know... how to handle... heat?

    Shall I describe a ramjet to you?

    Or maybe we could go with something like the Space Shuttle's reentry tiles?

    In conclusion, you are vastly uniformed as to the state of... not even state of the art technology, that would be incredibly relevant to this discussion.

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  • [–] 1 point 6 months ago* (last edited 6 months ago)

    Those efficiencies are for large senders and receivers. When you have to make it small for a drone the numbers gets worse.

    None of those make continous evasive maneuvers. All the things you mention works because the flight path is fully known in advance and you have full synchronization and ability to lock orientation. None of this works on a drone in urban environments where you'll constantly lose line of sight.

    Dude I'm not talking about heat I'm talking about literal about the literal MW receiver's physical LOCATION on the drone body AND THE ACTUAL PROPULSION IN FORM OF MOVING AIR, because the receiver has to be large, and oriented to the sender at all times, which means there are orientations in which it will block at least some propellers from pushing air physically downwards, unless those also are built to extend far out AND CAN TWIST THEIR ORIENTATION TOO

    (remember that propeller flight obeys the laws of Newton, pushing air down keeps you up and if you tilt your drone to align with the microwave center then you must tilt your propellers or you'll be flying sideways, unless you put receiver on a gimbal in which case it's stupidly complex and you now have to adjust airflow across non-blocked propellers when the receiver is below some of them)

    You can not win an argument by misunderstanding the counterarguments. You lose by not even being able to imagine how a drone actually flies physically in the air, not to mention your lack of ability to just read

    Not to mention that you didn't even ask yourself what happens to a microwaved power transmitter in war. Guess what? It gets targeted and destroyed in seconds. You're dead now. Bye.

    And you can't even make a drone swarm work. Either you have a dozen transmitters (lol good luck) or a phased antenna array in which lol fucking lmao that thing will spew out heat losses and get banned from operating near any remotely populated area due to radio interference

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