Re: Another mighty initial thrust idea
"If the mass of the girder+payload is zero, the air resistance is zero and the friction of plane against the rod is any value greater than zero"
My point was not that air resistance is related to mass - but that both are very low so that the total of the forces available to act against friction are also very low. At the point of firing the rocket, before the plane has any speed relative to the rod, it cannot overcome even a small force due to friction so any icing or damage to the mechanisms will result in the plane dragging the launch platform. Also there is very little mass to build inertial forces to prevent the launch platform turning so any out of balance forces will render the rod critically unstable.
I'm not getting much support for my theories and there is a lot of real knowledge on this forum so I am probably wrong.