Questions tagged [rcs]

Reaction Control Systems, small thrusters to control attitude and occasionally translation of a spacecraft.

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47 views

Where are Falcon 9 1st stage GN2 tanks located?

Is nitrogen propellant for the two cold gas thrusters pods contained in the interstage? The view we have from the B5-B1050 recovery shows several small COPV(s) pic1 Here you can see where the cold gas ...
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56 views

Details on Starship's Reaction Control System thrusters

Recent renderings of the proposed lunar starship has stirred speculation about what those 12 small landing engines are, half way up the space ship. In guessing they may be the same engines being ...
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1answer
126 views

Bipropellant RCS systems: Do they go together with docking? Or with manned spaceflight?

In a recent discussion, I asked about using a certain bipropellant system for RCS thrusters (I was actually thinking about it as fuel for an MMU jetpack or the "scooter" commonly imagined in science ...
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2k views

How dangerous are RCS thrusters?

How dangerous are RCS thrusters, in a vacuum, to A. other spacecraft, especially when docking, and B. astronauts in EVA suits? How far away do you have to be to be safe / do RCS thrusters need to be ...
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1answer
97 views

RCS or Reaction Wheel for a 30kg cubesat

I am working on the design of a cubesat, it weighs approximately 30 kg and I am doing the Navigation and Guide Control system. I was wondering if I had some blueprint for some RCS or Reaction Wheels ...
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1answer
122 views

Is there an alternate term to “fired” for the Reaction Control System?

Do the astronauts use any word, other than "fired" when referring to the use of the Reaction Control System for attitude control or translation?
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1answer
111 views

During the MSL (Curiosity) Mars atmosphere entry, when was the last time the Reaction Control System used?

I understand that the Mars Scientific Laboratory used its Reaction Control System during its entry into the planet's atmosphere. At what altitude was the RCS last used? "Seven Minutes of Terror" ...
26
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2answers
2k views

Why aren't RCS openings an issue for spacecraft heat shields?

A spacecraft which needs to both maneuver and enter the atmosphere needs both a reaction control system and a thermal protection system (aka heat shield). As the heat shield needs to be on the outer ...
7
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1answer
182 views

Apollo SM RCS specific impulse?

What is the specific impulse of the RCS thrusters on the Apollo Service Module? This document cites 281 seconds for the LM's RCS thrusters, but I cannot find similar specs for the SM.
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2answers
130 views

Apollo CSM RCS maximum number of simultaneously active engines?

Reading the RCS subsystem manual, it seems like each RCS quad of the Apollo SM consisted of four hypergolic engines. Am I correct in saying that all four engines of each of the four quads could be ...
7
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1answer
110 views

Apollo CSM mass, inertia and RCS parameters?

Is there a document specifying the total mass, the 3-by-3 inertia tensor of the Apollo CSM assembly, as well as the geometry of the service module and command module RCS assemblies (in other words, ...
3
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1answer
229 views

What are the limitations of monopropellant RCS thrusters in a re-useable spacecraft?

I understand the disadvantage of monopropellant is mainly dependent on the life of the catalyst. There is a possibility of catalyst failure due to it being subjected to catalytic poison and catalytic ...
2
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1answer
57 views

What lateral and rotational accelerations can a spacecraft achieve?

I've found information like the Space Shuttle Orbiter has so many thrusters each generating so much force to maneuver "with redundancy" in orbit. But without knowing something like how many thrusters ...
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2answers
910 views

Is it possible to use RCS instead of gimbal to control first stage attitude?

Questions like this one emphazise the role of gimbal to control the attitude of the first stage. But once in orbit, satellites usually uses reaction control systems. Is it possible to use RCS to ...
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237 views

Why does candidate optimal group computation produce strange results when thrusters are too close together?

I have two thruster configurations I'm testing. One is almost symmetric about its center-of-gravity (it's a little bottom-heavy, but the thrusters themselves are the same fore and aft). The other has ...
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6k views

Was the Space Shuttle ever rotated to induce artificial gravity?

The Space Shuttle was a fairly compact transportation vehicle in terms of the amount of space available for astronauts to move around. Did they ever attempt to roll a Space Shuttle to induce ...
4
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1answer
319 views

Could Vostok 1 deorbit on its cold gas thrusters?

Citing the Wikipedia article: The orbit's perigee and apogee had been selected to cause reentry due to orbital decay within 10 days (the limit of the life support system function) in the event of ...
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1answer
1k views

What is the minimum number of RCS thrusters capable of stabilizing a satellite against an arbitrary rotation?

In case of a very specific rotation, even one suffices, but it must be located just right for that specific axis of rotation, and if you want to rotate the satellite, it can do so in that specific ...