Love it how the same quotes get misunderstood, removed from their context and cherry picked, on and on, to support a claim(note, something that can be solved with Physics and Maths alone) that nothing else does. Veterans cant be wrong, no way, they were there, even if one would take whatever they said completely out of context.
I see no reason to repeat the 150 pages of Ubizoo here.
By the way, perhaps go and see your own post, Gaston, I dont think even YOU would think a turning radius can be quick, do you? Karhila didnt.
EDIT: by the way, 250kmph IAS is well below 109's speed for best rate of turn.