4.101 RC - List of fixes

[PE_Tihi]

Originally Posted by Fenrir

Ah, so now you talking about longitudinal stability, which has nothing to do with elevators;

You confuse the lateral and longitudinal stability; longitudinal certainly has to do with the elevators.

Originally Posted by Fenrir

"...almost certainly the reason is TD moving the CG backwards...
...."

There are many reasons not just CofG for trim change, and if you'd studied aerodynamics as thoroughly as you claim, you'd know this. Trim change can be accomplished through airframe/fixed surface/moving surface design and even by the manner of mass balance - to accuse TD of moving the CofG position, well, you assume too much. Especially as the spits do not exhibit any of the other criteria to warrant an accusation of pitch instability.

'Almost certainly' is an acknowledgement they may be other reasons. That is improbable because the much reduced longitudinal stabillity of the plane compared to 4.09. indicates the CG has been moved backwards relative to its 4.09 position.

You say in a previous post 'there is NO behavior AT ALL which indicates pitch instability. The a/c does NOT tighten up in turns..'
For the 'turn tightening' to appear, CG has to be BEHIND the plane AC, which would make the plane completely uncontrollable- ie. instable in the absolute sense. If that s your criterion for where the bad stability and handling begins, please better avoid flying your designs yourself

And if you see 'no pitch instabillity at all' here, then am not going to waste any more time explaining. I wrote enough in the thread.

"They showed us all a pic of a modern day restored Spitfire flying in formation with a photo a/c at low airspeed with significant down elevator deflection."
How on earth do you find this a proof of anything else, but the Spit having the movable elevators? Next second the elevators could 've been in another position. Or do you beleive formating pilots have orders against moving their controls?

Regarding the belittling attitudes, etc, please refer to your posts here. As for the TD, their job are not anyone's grievances; they took over modifying an FM in an acceptable manner.