Solid fuel tanks and engines (of course only being able to be supplied from the adjacent tanks).
Obviously, it should be impossible to cutoff them once ignited (leaving staging as the only way to remove them mid-burn).
Solid fuel tanks and engines (of course only being able to be supplied from the adjacent tanks).
Obviously, it should be impossible to cutoff them once ignited (leaving staging as the only way to remove them mid-burn).
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