4mo ago

Giant catapult defies gravity by launching satellites into orbit without the need of rocket fuel - The Brighter Side of News

www.thebrighterside.news Giant catapult defies gravity by launching satellites into orbit without the need of rocket fuel

Satellites are critical for monitoring Earth's health, identifying issues like methane leaks, and conducting various other types of research.

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4mo ago

Giant catapult defies gravity by launching satellites into orbit without the need of rocket fuel

www.thebrighterside.news /space/giant-catapult-defies-gravity-by-launching-satellites-into-orbit-without-the-need-of-rocket-fuel/

11 5

Good News Everyone @sh.itjust.works

Mouselemming @sh.itjust.works

4mo ago

But is it really a catapult?

www.thebrighterside.news /space/giant-catapult-defies-gravity-by-launching-satellites-into-orbit-without-the-need-of-rocket-fuel/

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21 comments

This is just investor bait.
Remarkably, this process eliminates the need for rocket fuel
No, it doesn't. It's physically impossible to fling something into orbit from earth.
You can fling it into space, but you need a circularization burn or it will just fall back down.
And since you can't accelerate anything past Mach 5 or so inside the atmosphere, the circularization burn will need to be 90% of the delta V.
- Thanks for the detail! I thought it should definitely be possible in theory to throw something into orbit. But you're right, I didn't think of the atmosphere and its friction. You would also have to throw at a very flat angle so theres a lot of atmosphere for your projectile to pass through.
  
  Even without air friction, and no matter how flat you throw it, you'd always throw it into an elliptical "orbit". But the lowest point of the ellipse would still be on the surface, no matter how high the upper end is.
  So it would always come back down, unless you give it another push at the highest point (in space).
  If you just throw it even faster, you'll hit escape velocity and it would leave earth entirely.
  
  Makes sense as well. So the projectiles they throw not only have to be able to withstand the launch and release the payload, but they also have to be functioning rockets to allow for a circulation burn...
  Well good luck to them.
  Edit: I think I had that animation in mind where the canon shoots a canon-ball into a circular orbit (don't remember where I saw it), but I guess that's impossible, too, then. >.<
  
  Works on a moon w no atmosphere, not on Earth.
  
  Just build a tower taller than the atmosphere, now you don't need rockets because you have a space elevator.
  
  Damn, physics

21 comments