9 points
One thing I could think of would be miniaturized railguns. A large part of the bulk in rail guns at the moment is the cooling system for the electro magnets and capacitors to deal with inefficient power delivery.
A room temperature superconductor would fit both problems.
1 point
5 points
Railguns have the unfortunate side effect of applying their full acceleration over just the length of their rails, which tend to be relatively short compared to the thickness of the atmosphere.
They’re fun to shoot some bullets at hypersonic speeds, not so much to impart higher than orbital speeds to complex structures when they get pancaked before leaving the muzzle.
