[bongodriver]

Originally Posted by Crumpp

Where does this come from??



It is patently false as a generalization.

While many WWII fighters were unstable in very specific conditions such as in climb power with a specific speed range or landing configuration.... most were stable and met the requirements.

It is was very rare for a design to be unacceptable over the range of the envelope such as the Spitfire.

Read page 18 of the NACA report and note the conclusion of satisfactory for short period oscilations (remember they were the ones that really counted)
and was noted as satisfactory for stick force gradient appart from 'flaps down power on', page 19 is good reading too.
Then try to show your smug face here again when you realise you have been completely discredited.

http://jsbsim.sourceforge.net/spit_flying.pdf a link to the report