A balloon rocket would blow out all of it's air (fuel) within a very short amount of time meaning that the rocket/balloon would have to reach a high velocity within a extremely short period of time. Since there is friction from air the required speed would have to be higher. To get pass the Karman line you need to reach a speed of 1.4 km/s. If you wanted to power a rocket with air like a balloon and release is a possibility of getting to space. If you wanted to build a big balloon and then release it will fly uncontrollably and will probably never reach space. Well there are a few methods of getting to space with a balloon rocket. (But we'd probably use hydrogen, not helium.) Maybe the numbers indicate something crazy like a 10 km 3 volume. Any chance to utilize an elastic hull material to store energy? In order to get very high we need a huge balloon with very low density helium.The nozzle speed of the propellant is lamentably low.I think helium or hydrogen are not our first choices as propellants but it's what we have to work with.This is the first time that our propellant lifted us, and not the other way round.The thin atmosphere does not cause much friction at lower speeds (the returning first stages of the Falcon 9 start their entry burns at 55 km and > 7000 km/h).Couldn't one use the gas in the pressurized balloon the same way? How fast could one go? Any chance to do a sub-orbital hop? (I'm aware of what is difficult about spaceflight - immortalized by xkcd - but just humor me.) Now when I let go of a little toy balloon in my living room they achieve astonishing speeds. Those balloons often rip because the light material cannot handle the overpressure at these high altitudes. High-altitude helium balloons have reached altitudes of over 50km. This question asks about using the balloon itself as the rocket, like a toy balloon one lets go of at home which flies around for a few seconds, making a farting sound. This question is not about rockoons, which are rockets using balloons as launch platforms to start from a greater altitude.
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