2 ms·
> True, but you can have the pressure in the tank bigger than in the combustion chamber, right? I guess you can if people have done it. I've never built a roc
by kragen 2y ago
> True, but you can have the pressure in the tank bigger than in the combustion chamber, right?
I guess you can if people have done it. I've never built a rocket myself, so I don't know, but I thought the combustion-chamber pressure had to be crazily high to get the high exhaust velocity you need for propulsion.
Thank you very much for enlightening me!
- avmich 2y agoSurprisingly you don't need to have that large of the pressure in the chamber to get to the sonic speed in the throat - and more than that in the diverging nozzle. E.g. 3 bar pressure in the chamber could be enough for that. French Diamant rocket, the one used to launch their first satellite, had a pressure-fed first stage. Lunar Expedition Module from Apollo program had a pressure-fed ascent stage.