Fast Airbrakes

let's assume that it's possible to maintain a object floating in the air, when we acelerate with the object there's basicly only one way to stop it, airbrakes.

let's assume that same object is traveling at a speed of 300 Km/h, is it possible to build a airbrake system able to fully stop the object in less than 1.5 seconds?

 

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If it's possible to accelerate said object from 0 to 300 km/h in 1.5 seconds, then you should be able to do the opposite.

I don't know of anything with that sort of acceleration.

 

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The braking system on an aircraft carrier is probably the closest thing. Or maybe a brick wall.

 

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actually breaking an object isn't quite the same as acelerating it, when a object is traveling at an average high speed, in an ambient with a very low friction, it's very hard to break it easily, we need almost 4~5 times the energy to break an object travelling in the air that we need to acelerate it.

 

the brick wall is definitely not a solution.

but basicly, I wanted to know if it's theoricly and mechanicly possible to airbrake an object that weights aproximately 3000 Kg traveling at an average speed of 300 Km/h in 1.5 or less seconds.

 

Anything that gives it a reverse acceleration of 6g.
A big nasty-ass reverse thruster would do it. Perhaps a big enough parachute would as well, but I don't know how to calculate how big. You'd need an average force of 167000N (17 tonnes weight), but the maximum force for a parachute brake would be significantly higher.

If it were carrying a large ballast, maybe you could eject the ballast forward using springs, pneumatics, or hydraulics? Not practical, I think. You'd probably need a ballast several times larger than the object.

 

if 3tonns of mass, moving 300km/h has to stop under 1,5sec or under then its basicly same as ramming the brick wall. Even 1tonn car moving 50km/h cant stop under 1.5 seconds.

 

It could if it ran into a haystack... that's not quite the same as a brick wall.

 

How about a directed explosion? ...similar to anti-missile protection on tanks, reactive armor.