propulsion's questions - Chinese 1answer

287 propulsion questions.

I have recently had a renewed interest in comets and how comet tails are formed. From studying this process, a thought occurred to me that perhaps plasma ions can be created within a long hollow ...

In this article on The Planetary Society website, I read this about solar sails: At an acceleration rate of 1 millimeter per second per second (20 times greater than the expected acceleration for ...

I have a few questions about computing torques and forces. I use the same configuration as in the thesis titled An Attitude Control Sysytem Design Based on the Turksat-1b Geostationary Satellite. ...

Why does SpaceX use RP-1 in the first and second stages of their rockets? In my view at least the second stage could use hydrogen as it currently is not being reused. I am aware that you have higher ...

Is there any relationship between the sound emitted from a rocket engine and the amount of thrust it gets at surface temperature and pressure?

The pintle injectors tend to generate droplets after impingement of the fuel and the oxidiser stream and I understand that the droplets will be premixed. In such a case, even a larger premixed ...

The Sabre engine is designed to power the Skylon SSTO vehicle. It reduces the amount of oxygen that needs to be carried by cooling and compressing air in the early part of the flight. More hydrogen is ...

On videos of Soyuz docking to ISS we can see exhaust from the control engines (if background is dark enough). For example here Soyuz TMA-19M docked to ISS at ...

Propulsion technology for cubesats and nanosatellites is in active development, but there are at least a few based on sound principles that are likely to be tested in the next few years. There are ...

As I observed ignition of several rocket engines (Shuttle, AMDE, Lynx Suborbital, Saturn V) they all come through a couple phases - emitting various vapors, unfocused flame, etc, before the proper "...

The idea of using an atomic bomb as a propellant was introduced in project orion, but it did not work out because of the interdiction of using the atomic bombs. So I decided to calculate the speed ...

The SABRE engine is designed to be used on a single-stage-to-orbit type of spaceplane. What sort of delay might occur between shutting down the air-breathing operation and switching to a closed-cycle ...

Aerospikes basically tackle the issue of the variability in required expansion ratio for a rocket engine to be efficient at a given altitude. A recent example though mired in legal issues is a small ...

Linear aerospike engines are an old idea that seem so full of promise. Why are they not widely used today by the likes of Boeing, SpaceX, etc.?

Hayabusa2 is on its final approach to asteroid 162173 Ryugu, expected to arrive in July 2018. Like its predecessor, Hayabusa2 uses an ion thruster for deep-space propulsion, but I can't find any ...

if we use Antimatter as method of propulsion is it possible to reach speed of light ?

There are some photos of the Apollo Lunar Module ascent engine, see 1, 2, 3. The nozzle looks like being made of epoxy and fiberglass. The fibers are wound in two different directions. Is it true ...

I wanted to know if we can thrust a rocket from earth using electric power? If yes, how and has anyone tried to do that?

@Antzi's answer links to the recent Ars Technica article NASA’s EM-drive is a magnetic WTF-thruster; Test reveals that the magic space unicorns pushing the EM-drive are magnetic fields.. According to ...

There has now been a third positive study of the EM drive, and while I'm still skeptical, I'm starting to wonder if this is really possible. As such, I'm wondering what would be required to make this ...

Rocket propulsion is based on Newton's laws. The faster propellant is expelled, the faster the rocket is accelerated. At what speed is propellant expelled in a normal rocket? What are the factors ...

Question: If LOX/LH2 were used in a fuel cell powering an ion engine could it provide a greater delta-v than with a conventional engine? Conditions: Start in space in a stable heliocentric orbit (no ...

In @David Hammen's answer to this question, he highlights the discrepancy between the exhaust velocity that would be achieved by converting all the chemical energy of the fuel into KE of the exhaust (...

A basic ion engine uses a positively charged plate and passes positively charged ions over it to accelerate them. How does the charged plate draw current to accelerate the ions? It seems that a ...

Space is filled with cosmic rays that are high-energy particles. If we could convert that energy into electric (or any other) energy, then we could use it to power a rocket anywhere in the universe. ...

In a high slow orbit can objects equal in weight traveling on the same orbital path in the opposite directions propel each other to intersect on the opposite side of the Earth in alignment to propel ...

So I've seen the railgun before, and it suddenly come up in my mind: can we accelerate a space shuttle/rocket to a high speed,before turning on the engines?Will it save fuel of destroy electronics?

Small (nano) satellites and cubesats are between \$100k and \$500k. What percentage of the total is the cost of the propulsion system?

These two good answers (one and two) to the question "Is there a maximum Isp for 'exothermic chemical reaction rockets?'" put the limits around 500-550 seconds for the limits of practical chemical ...

The BBC News article Rolls-Royce and Boeing invest in UK space engine about Reaction Engines Limited (REL) and its Sabre engine states REL is developing what it calls the Sabre engine. This power ...

I'm working on a hypothetical constellation of orbiters at Venus for a school project, and I am currently trying to figure out how much fuel I need in the transfer stage. I have already calculated ...

Trying to calculate the impulse of a little ion thruster I'm putting together. An old version of it can be found here, I'll be polarizing the AC current and putting in copper nails on the next ...

Typically, when trying to adjust simulation parameters (of orbit control, attitude control...) to real world values in order to validate algorithms with comparisons with past and current mission ...

The comment chain on What is the feasibility of launching a probe to Sedna? indicates RTG thermocouples decay. With the passage of time the thermocouple may even have the ability to transduce an ...

In most of chemical propulsion engines the product of burning fuel and oxidizer is the propellant; in some cases the ratio between the two is non-ideal, in which case some unburnt fuel acts as ...

As part of my research project, i am evaluating various satellite propulsion systems. Are there any databases or forums where the ROM cost of a Satellite propulsion system is listed. A few new space ...

Some questions popped up about difficulties of creating throttleable liquid fuel engines. I wonder why the obvious alternative isn't more common: multiple engines, from which only some will be lit; ...

Looking to explore the inverse point of this question: What challenges are there for more, smaller liquid fuel engines instead of one large? As stated in the answer to the above question, fewer, ...

Been following a Make-Magazine article on how to make your own ion thruster: https://makezine.com/projects/ionic-thruster/ Went through the tutorial step by step, not seeming to get any thrust out of ...

What is the difference between colloid thrusters and ion electro spray thrusters

An electric sail harnesses the solar wind for propulsion. Inside the magnetosphere of Earth, the solar wind does not reach. Yet the Aalto-1 satellite intends to deorbit using an electric sail. How ...

What if the craft itself had a magnet at the rear, with an equally sized magnet that you could either bring towards the craft to propel forward ....or controlling it away from the ships magnet to ...

Is there something that makes injectors unsuitable as oxidizer pumps? Seems to me that rockets would benefit significantly from a pump with no moving parts that runs off its own exhaust.

After watching one of the videos from Curious Droid on Youtube talking about asteroid deflection and strikes I had an idea. Ion thrusters provide bits of mass velocities at the needed Isp (5-6 km/s ...

I mean, it's called an aerospike engine for a reason, I guess, but are there any other advantages to the engine that accrue in space? Is the bell configuration better in a vacuum?

Methalox rocket engines (Liquid Methane and Liquid Oxygen) have theoretical specific impulse in the high 300's. Hydrolox rocket engines (Liquid Hydrogen and Liquid Oxygen) have theoretical specific ...

Question is fairly self-explanatory, but I couldn't find an answer on Google. I would expect ion thrusters because of their efficiency. Thanks!

The Space Launch system is being designed to use initially a modified Delta IV upper stage, but then the Exploration upper stage with 4 RL-10 engines. Why wouldn’t they just use a RL-60 engine which ...

Given the highly corrosive nature of LOx and the extremely low temperature, what materials are usually used for the LOx pumps? Steel, Copper, and many alloy tend to be flammable in liquid Oxygen ...

After the launch and six-hour cruise, the Falcon Heavy’s upper stage will fire a third time to send the Tesla into a cycling orbit between Earth and Mars. This should take the Tesla out as far as the ...

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