Thanks for the clarification. Since I have a degree in physics, I'm reassured that such things are still as true today as they were in university.
I'm also sure you'd agree that - in general - when things like aeroplanes get bigger, they also get heavier (OK...more massive
). Yes, it's simplistic. But it makes the point.
In any case, I don't think I dismissed anything. I was just trying to keep the arguments relevant to the original point.