Linked Questions

8
votes
4answers
4k views

Is there a maximum Isp for "exothermic chemical reaction rockets"?

The question Is there a maximum $\text{I}_{sp}$? reminded me that I once read somewhere that the maximum possible $\text{I}_{sp}$ for a rocket engine based on expansion driven by exothermic, ...
11
votes
2answers
2k views

What (actually) makes Iridium "the world's only truly global mobile satellite communications company"?

In this article about how the SpaceX anomaly will affect Iridium it says: In its official website, Iridium describes itself as "the world's only truly global mobile satellite communications company....
11
votes
1answer
3k views

How does an Electric Solid Propellant rocket work?

I saw the section in Wikipedia about Electric Solid propellants but I can't figure out what it really is, and how it works. It sounds like a solid propellant rocket that you can start and stop ...
3
votes
3answers
911 views

Is HAN-water propellant "green" enough to ever be used in a cubesat?

I just read about the "green" propellant Hydroxylammonium nitrate writing this answer. It will be tested in the Green Propellant Infusion Mission (also see GPIM AF-M315E Propulsion System). Catalytic ...
2
votes
2answers
526 views

Does a feasible high thrust high specific impulse engine exist using current non space technology?

What I mean is an engine whose thrust is on the order of tens to hundreds of Newtons with an ISP "well" above that of chemical engines. I don't require this engine to be space ready - if it has to ...
4
votes
2answers
441 views

What is the Isp of gunpowder likely to be? Could this table be right? Can it even be determined?

There are some unsourced refutations of the value for the Isp of gunpowder in the table shown below can be found under What kind of engine does this Isp = 1600 refer to? Is it cubesat-friendly? Alas ...
4
votes
4answers
647 views

Does "What happens beyond Kármán, stay beyond Kármán"?

The title refers to the promotional slogan "What happens in Vegas, stays in Vegas." The question How much CO2 would city-to-city rocket flight produce compared to airliners? seems to be focused on ...
2
votes
1answer
340 views

How much thrust can plasma produced from water have?

If water could be converted to plasma for a propellant by electricity how much thrust would water produce? What would be the byproduct?
1
vote
1answer
107 views

What are all the kinds of electric propulsion that don't qualify as ion propulsion in standard spaceflight lingo?

Comments on the meta question We have both electric-propulsion and ion-thruster tags, are they distinct? What would be good usage guidance for electric-propulsion? indicate that the term "...
1
vote
0answers
39 views

Prop feed with Anhydrous Ammonia in Microgravity

Considering contributing to an SBIR through my PhD where we're looking at NH3 as a green prop solution. Need to figure out how to feed vapor from a liquid/mixed phase tank to the a prop system. ...