We need blocks with either negative weight or settings that would allow for neutrally buoyant aircraft to be more feasible.
For example, I have spent more than sixteen hours working out the kinks in a vtol "blimp", and that has been extremely troublesome for some reason. Also they would have to not be a mod so that everyone has access to them. What do you think?
Well, If you use the overload mod you can set mass to zero. From what I understand setting negative mass does some odd things.