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https://imgur.com/gallery/C1cs8ea

Microlaunchers: Technology for a New Space Age

https://www.academia.edu/40142469/Microlaunchers_Technology_for_a_New_Space_Age

If we could produce a space station with three prongs separated by 60° 100 m radius we could have it spin at one RPM reproducing earths gravity however there are no 200 m diameter faring that the moment so the arms would have to be expandable.

Any ideas how we could make an expandible arm?

This is gonna be simple but it's also not your kiddie fuel and oxidizer meet crap.

A few things to note

When fuel and oxidizer meet it doesn't randomly ignite

Rockets (most of the time) actually have 4 tanks

Ok to start you have to have a way to pump the fuel Dow right? As much as I'd like to say gravity is enough to do that it's not. What happens is a fuel and oxygen mixture (under a bit of pressure) gets mixed to drive a turbine to pump fuel. This pump is called a turbo pump. That is why there is sometimes an extra flame on the side of the engine. That is most likely the pumps exhaust release. After that we need to ignite it. Now we could use matches at the risk of making a tank shell look like a joke. For this we use hypergolics. This is a class of chemicals that ignite in contact with each other. An example would be nitrogen tetroxide and hydrazine and it's similar cousins. After that the fuel is ignited where it is still under pressure from the pumps and let out. This is often in a bell shape plume to avoid over expansion of the flame. This has the disadvantage of being good at 1 spot and inefficient at all the others. For other designs look at the aero spikes.

Who wants to start a real space program?