FSX canard plane stall behaviour

[dave hoeffgen]

Hi,
Does anybody know how to tweak the .air file to make a plane go nose-down instead of stalling?

Because of higher AOA the canard style elevators stall earlier than the main wings so the nose goes down
and the plane does this kind of nodding movement instead of stalling.

This behaviour is what I want to achieve but I don't have any idea what to do to the airfile.

Thanks in advance,

Dave

 

[bigglesworth]

Not sure, but I remember that this was one of the selling points of the old Quickies and Q2s: They would not stall, because the canard WOULD stall, but stall first, dropping the nose and allowing the main wings to recover regardless of the pilot's inputs. The Quickie people called the nodding movement "pitch-bucking".

 

[Roy Holmes]

Unfortunately, you can not stall any control surface in the sim except the wing.
The wing lift characteristics are given in Record 404. At and above the stall AOA, the wing lift coefficient decreases rapidly.
There are lift coefficients for the elevator and horizontal stabilizer, but they are fixed values per radian of their incidence/deflection angle and have no stall characteristics as such.
Roy

 

[dave hoeffgen]

What I thought about was setting the reaction of the plane directly.
I tried editing the Pitch Moment Coefficient in record 473 to decrease at less AOA than wing lift.
The result did not prevent the plane from stalling but made it impossible to recover when stalled.

 

[dave hoeffgen]

Anyway, playing around with these two tables (404 / 473) seems to take me closer to what I want to get.
Just another few hours of trial and error.

 

[vololiberista]

Could you not get the plane to fly backwards! In essence a Cannard is a tail but fixed at the front instead of the back. Or do it the normal way and perhaps reverse all the tail settings in the airfile. Therefore making it act like a wing. Otherwise have a very low angle of attack recovery. I modelled a stick pusher in the VC10 which works quite well. In the real aircraft the stick shaker will operate and then the stick pusher. In the model I have allowed the incidence to increase a little more than in real life so that the stall klaxon sounds. This is just for effect! So, if a stall occurs under AP control the AP disengages, the stick pusher operates, elevator trim goes to neutral, and the pilot recovers. If a stall occurs when flying manually, the control column is momentarily disabled, the stick pusher operates, elevator trim goes to neutral, and the pilot recovers.
In essence it's all a matter of degree. At what point in the stall to initiate a recovery.
In real life the VC10 was very difficult to stall. And, in spite of it having a T tail could not super-stall on account of its super critical wing shape and engine clusters. The a/c always went nose down at the stall. The designers were so confident that initially they decided not to install a stick pusher. But it was done on a belt and braces principal. So, with the stick pusher operating the actual stall never fully happens.