# Questions tagged [burn]

Questions about the combustion of a material and the material is consumed by the fire .

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### Computing Flight Characteristics for Different Propellant Grain Geometries?

Consider the following image: I am interested in mathematically accounting for some of these different geometries but have had little success so far in finding how this can be done. The first thought ...
• 31
406 views

### Starship deorbit process

It does not seem to me that SpaceX will use thrusters similar to Draco to deorbit Starship, and I think firing a Raptor would be too powerful. All I can imagine is that it will use ullage gases ...
2k views

### Why is the Orion capsule using 2 burns to transfer from the moon back to earth instead of one?

I was reading an article about how the Orion capsule just did the first of two burns that it will use to transfer out of its lunar orbit and back to Earth. I understand the phenomenon of a gravity ...
• 233
674 views

### Modelling a circularizing burn at Apogee

I am relatively new to rocket physics and am looking into modelling burns. Is there a good place to start modelling an orbital burn? I know about the rocket equation but perhaps that is not what is ...
• 61
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### Further understanding of a de-orbit burn problem worked on in 2018 [duplicate]

I'm having trouble understanding exactly how calculations in this answer to Calculating a de-orbit burn, is this problem written correctly? were performed. It’s been a while, but now I’m working on ...
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1k views

### Orbital Rendezvous vs Hohmann Transfer

Let's assume that a spaceship (capsule) is about to dock to the ISS the distance between spaceship (capsule) and ISS is 20 meters the relative velocity between the spaceship (capsule) and ISS is ...
2k views

### Circular to elliptical orbit delta V requirements

this might be a dumb question, but i've been recently trying to calculate the delta V to deorbit a satellite, and I've run into a problem. Assuming a 400km circular starting orbit(and disregarding ...
• 123
307 views

### How would off-apsis burn affect the angle and position of new apoapsis

Let's say you have an elliptical orbit, if you burn prograde at the periapsis, you extend the apoapsis by some factor(according to vis-viva equation). But if you burn prograde on somewhere during the ...
• 81
3k views

### Longest continuous burning chemical rocket engine?

I'm curious as to what rocket engine in a launched rocket burned the longest in a continuous fashion. I'm not interested in testing burns or inter-planetary engines which are designed for low-thrust ...
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531 views

### Burn time to raise to an elliptical orbit from an elliptical orbit

I am trying to simulate orbit raising like India's MOM mission did in order to get escape velocity. But I can't determine the best/most-suitable point/time on the current orbit where the probe should ...
2k views

### Ways to obtain thrust curves of different grain geometries

Different grain geometries in solid-fuel rockets produce various thrust curves: I can imagine it's not too difficult to obtain a thrust curve of a specific grain geometry with a measurement while ...
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