New answers tagged

1 vote

Important new additives to hypergolic hydrazine-based fuels since 1972?

The problems with fancy fuels and additives is that they tend to increase costs and complex chemical mixtures may potentially create serious stability issues (see sections on RFNA and chlorine ...
  • 7,258
3 votes
Accepted

Silane as a rocket fuel

Has silane ever seriously been considered as a potential rocket fuel and, Yes silanes has been considered as fuels, at least during the early scramble to develop storable hypergolic propellants for ...
1 vote

What engine cycle is best for a large lunar lander?

I would argue a simple pressure-fed engine cycle is a good option. These are low complexity and reliable, which are very attractive properties for a lunar landing system. They can not have high ...
3 votes
Accepted

How were inflatable fuel tanks for NASA supposed to work?

The basic concept of a bladdered tank is that the bladder makes it so that only propellant leaves the tank and so that propellant can be used even under zero g conditions. Compare with a bladder-free ...
  • 70.6k
1 vote

Propellant mass calculation

As discussed in the comments, your calculated value is correct and the test solution is wrong. I will however make a note about this part: Furthermore, if I consider the manoeuvres being performed in ...
5 votes

How to account for burned fuel mass when calculating spacecraft acceleration?

You can in fact do a straight reaction mass calculation if you have the exhaust velocity - rocket+fuel at steady state then fuel at speed X in one direction and rocket in the other. The issue is that ...
22 votes
Accepted

How to account for burned fuel mass when calculating spacecraft acceleration?

The quantity you ultimately need when planning your manoeuvre is change in velocity, which in spaceflight terminology is called delta-v, $\Delta v$ (searching this term would give you a lot of ...

Top 50 recent answers are included