What is "aircraft stability" - IN VIDEO

[fruitbat]

Originally Posted by Crumpp

Answer the question JtD:

Why did they modify the aircraft with an inertial elevator?

Heres a question.

If they realised that they needed it for the MkV which no one disputes, why did they not come to the same conclusion for the Mk I in 1939?

It wasn't new tech.

And it has SFA to do with NACA, since they added Bob weigths to the MkV before NACA ever got there Spit V to test.