How space shuttles maneuver or could maneuver.

  • Thread starter wasteofo2
  • Start date
  • Tags
    Space
In summary, space shuttles fly in a completely straight course propelled only by inertia, and begin to maneuver themselves into a proper landing trajectory before or after they actually enter Earth's atmosphere. However, a space shuttle which is just in orbit is much more maneuverable than a fighter jet, and would not be possible to fly using current methods of propulsion.
  • #1
wasteofo2
478
2
As far as I know (and I may be horribly wrong), aside from the maneuvering that occurs during takeoff and landing, space shuttles fly in a completely straight course propelled only by inertia.

Firstly, I'd like to know if that's right or not.

Secondly, I'd like to know if space shuttles begin to maneuver themselves into a proper landing trajectory before or after they actually enter Earth's atmosphere.

Thirdly, just out of curiosity, would space shuttles which can direct themselves with the same relative ability of planes be at all practically possible with using current methods of propulsion, or will I have to wait for a new method of propulsion before star wars style dog fights happen?
 
Physics news on Phys.org
  • #2
Well, not a "straight" course. since they are in orbit. :=)

I do believe they can change attitude though.
 
  • #3
Originally posted by selfAdjoint
Well, not a "straight" course. since they are in orbit. :=)

I do believe they can change attitude though.

I need to learn to be more specific, I meant a space shuttle that is traveling to another celestial body.
 
  • #4
The space shuttle does not travel to any other celestial bodies.

The space shuttle has a very sophisticated orbital maneuvering system (OMS) and reaction-control system (RCS) capable of changing orbits and attitude, respectively. If the shuttle was just a ballistic spacecraft , the astronauts aboard it would not be able to select when they re-enter, nor would they be able to put the craft into the right attitude to survive that re-entry.

And yes, the shuttle assumes its proper re-entry attitude before the de-orbit OMS burn that brings it back into the atmosphere.

- Warren
 
  • #6
Originally posted by wasteofo2
As far as I know (and I may be horribly wrong), aside from the maneuvering that occurs during takeoff and landing, space shuttles fly in a completely straight course propelled only by inertia.

Firstly, I'd like to know if that's right or not.

Echoing what had been said already, they are in orbit, so it isn't a straight line.

They generally don't do much in the way of maneuvering once they have attained orbit. They maneuver to get to their mission's orbit, do the mission, and then maneuver to get out of orbit.

Here is a site describing an orbit (it may not be the best... I just picked the first decent one which popped up googling for Keplerian Orbital Elements

http://www.amsat.org/amsat/keps/kepmodel.html [Broken]

A picture to go along with it is here:

http://www.profc.udec.cl/~gabriel/tutoriales/rsnote/cp5/5-5-1.gif [Broken]

Secondly, I'd like to know if space shuttles begin to maneuver themselves into a proper landing trajectory before or after they actually enter Earth's atmosphere.

Before. They do a burn which puts them in a flight path angle (velocity to local horizontal) of about 2-3 degrees at an altitude of about 120km up. Their orientation during the reentry is at roughly 40 degrees angle of attack.

Thirdly, just out of curiosity, would space shuttles which can direct themselves with the same relative ability of planes be at all practically possible with using current methods of propulsion, or will I have to wait for a new method of propulsion before star wars style dog fights happen?

No, it wouldn't be possible. A ship in orbit has a speed of many kilometers per second. To change course requires huge expenditures of fuel: usually a few times the mass of the spacecraft without fuel for large changes.

I need to learn to be more specific, I meant a space shuttle that is traveling to another celestial body.

Like was said, the shuttle doesn't leave low Earth orbit: it doesn't carry enough fuel. Even if it did, you'd still be traveling an ellipse around the sun. You never just go straight.
 
Last edited by a moderator:
  • #7
Originally posted by wasteofo2
Thirdly, just out of curiosity, would space shuttles which can direct themselves with the same relative ability of planes be at all practically possible with using current methods of propulsion, or will I have to wait for a new method of propulsion before star wars style dog fights happen?

I thought in last PF, myself and Andy started a thread on this. Do you mean the ship is in orbit or just in space? I would have thought that, with all the boosters in the right place, a space shuttle would be one if not the most manouverable thing we know (well...man made and in space), it is (relative) more manouverable than a fighter jet like an F14. Just strap on a couple of laser guns and proton torpedoes and you have the ugliest starfighter in the known universe
 
  • #8


Originally posted by enigma
No, it wouldn't be possible. A ship in orbit has a speed of many kilometers per second. To change course requires huge expenditures of fuel: usually a few times the mass of the spacecraft without fuel for large changes.
Actually, there isn't any reason why a couple of spacecraft couldn't do a Star-Wars style dogfight while in orbit. Its all about frame of reference - "stationary" is what the space station is relative to the spacecraft . "Forward" and "backward" at a few hundred m/s would be measured relative to the space station, not relative to a stationary point above earth.

Thats basically the way it works in Star Wars too, though they don't make any disctinction between flying in deep space and in orbit. But the fighters buzzing around the Death Star while its orbiting Endor are using the Death Star as a stationary frame of reference.

I realize the laws of orbital mechanics don't quite allow this, but as long as you keep the distance from the stationary reference point small and come back to it at the end of the fight, there isn't much deviation.
 
  • #9


Originally posted by russ_watters
Actually, there isn't any reason why a couple of spacecraft couldn't do a Star-Wars style dogfight while in orbit. Its all about frame of reference - "stationary" is what the space station is relative to the spacecraft . "Forward" and "backward" at a few hundred m/s would be measured relative to the space station, not relative to a stationary point above earth.

Although I agree that the volocity should be measured relatively, this is not the main problem. The trouble with Star Wars-style dogfights in space is the way in which fighter craft accelerate (change direction). In a vacuum, banking to one side and then "pulling up" the nose would not have the effect one sees on the screen. At least, not with current propulsion technology (as asked in the original post).

If you've ever seen a television series called "Babylon 5", there are some fairly realistic space combat scenes in that. But even these scenes would not be possible with current tech. It's just too fuel-consuming; the amount of thrust they display would require way more fuel than could fit in a craft that size using any currently-known fuel source.

But at least the B-5 space combat scenes would be possibe with currently understood physics and a better (more pwerfull) fuel. The type of manuevering seen ni Star Wars and most other space movies would require a new kind of physics to provide something for the craft to "push off" from. Like maybe the Ether or something.
 
  • #10
Not to mention that you need to slow down if you want to catch up to things ahaid of you...


etc...

Maneuvering in space is completely different than anything you're used to on Earth (or anything you've seen on TV).
 
  • #11
When I said space shuttle, I guess i used the wrong word all together, I was meaning to refer to the type of crafts which have been used to go to the moon.
 
  • #12
Originally posted by wasteofo2
When I said space shuttle, I guess i used the wrong word all together, I was meaning to refer to the type of crafts which have been used to go to the moon.

I thought that was what you meant. That would be a sace capsule. And they are even less able to manuever than the shuttle. Their fuek requirements are so high that the amount of fuek carried onboard is calculated almost down to the droplet; just barely enough to get their and de-orbit when they get back, and not the slightest bit to spare.
 
  • #13


Originally posted by jimmy p
a space shuttle would be one if not the most manouverable thing we know (well...man made and in space), it is (relative) more manouverable than a fighter jet like an F14.

Just caught this. The shuttle takes up to 2 minutes to rotate 90 degrees. Comparing it to an aircraft, it's less maneuverable than the Wright Flyer.
 
  • #14
oh right, my physics teacher is a liar in that sense, but i suppose a more advanced spacecraft should be extremely manouverable.
 

1. How do space shuttles maneuver?

Space shuttles maneuver using different methods depending on their location and purpose. In orbit, they use small rocket engines to change their direction and altitude. On Earth, they rely on aerodynamic forces to control their movements. During re-entry, they use a combination of aerodynamic surfaces and thrusters to slow down and land safely.

2. What controls the movements of a space shuttle?

The movements of a space shuttle are controlled by a combination of computer systems and manual inputs from the crew. The computer systems use data from sensors and commands from the crew to adjust the shuttle's trajectory and orientation. The crew can also manually control the shuttle using a control stick and other instruments.

3. Can space shuttles move in different directions?

Yes, space shuttles can move in different directions using their thrusters. They can move forward, backward, up, down, left, and right in space. On Earth, they can also move left and right using their aerodynamic surfaces. However, they cannot move freely like an airplane because they are still subject to the laws of motion and gravity.

4. How do space shuttles change their speed?

Space shuttles change their speed by firing their rocket engines or using aerodynamic forces. In orbit, they use thrusters to increase or decrease their speed. On Earth, they can adjust their speed by changing the angle of their wings and using their thrusters. During re-entry, they use aerodynamic braking to slow down.

5. What are the limitations of a space shuttle's maneuverability?

The maneuverability of a space shuttle is limited by its design and capabilities. It cannot move as freely as an airplane due to the lack of air in space. It also has limited fuel and energy, which restricts the number of maneuvers it can perform. Additionally, the shuttle's size and weight can also affect its ability to maneuver in different environments.

Similar threads

Replies
6
Views
800
  • Aerospace Engineering
Replies
5
Views
7K
  • Introductory Physics Homework Help
2
Replies
38
Views
4K
Replies
7
Views
5K
  • Aerospace Engineering
Replies
2
Views
7K
  • Sci-Fi Writing and World Building
Replies
22
Views
3K
Replies
86
Views
4K
  • Aerospace Engineering
Replies
28
Views
4K
  • Sticky
  • Aerospace Engineering
2
Replies
48
Views
60K
  • Introductory Physics Homework Help
Replies
2
Views
1K
Back
Top