About the elevons movement

[Ala12Rv-watermanpc]

Hi, just wanted to ask about the elevons movement in the M2000...when performing a pull (vertically or horizontally) I can barely see the elevons moving, even at very low speeds, I mean, the FBW system will move the elevons in a way that not necessarily correspond to what you do with the stick, I know, but Im pretty sure that there should be ANY movement in order to sustain a "g" pull right??...for the first fractions of a second, you can notice how the FBW make its magic and there is a sudden moderate movement but then, as you continue with the pull, they are in a pretty much neutral position :huh: or even more, in a slightly oposite position you would expect for the movement you are doing...

 

I mean that when on the ground, if you pull the stick, elevons move UP...if you push the stick, then elevons go DOWN. That has perfect sense to me, however, once airborn, the elevons move the oposite :huh: (well, as I said, they berely move at all, but the slight movement they make, a part from the FBW corrections, are the oposite they should)...

 

The only manouver, once in the air, in which you can clearly see them moving as "expected" is ROLL, there they move clearly and in the "logical/common" direction they use to move in other planes.

 

Im not an expert by any means on this, even less when FBW is involved but I guess there is something wrong as long as they mover UP when taking off (thus rising the nose of the plane UP) but then, once in the air, they move DOWN when rising the nose UP. it makes no sense to me.

 

any clue if this is correct/wrong??

 

thanks!!

Edited July 26, 2017 by watermanpc

[mvsgas]

This was brought up about a year ago. People notice on videos the elevon behave this way. So DCS model was change to match the videos. I'm sure if you look at videos or look through the thread you can find it. Basically, the way I understand, on this aircraft the elevons initiate pitch rate, once the rate is achieved, they just maintained it. The aircraft naturally wants to pitch up. AFAIK, the F-16 is the same way.

Edited July 26, 2017 by mvsgas

[mvsgas]

I think this was the thread that change that

https://forums.eagle.ru/showthread.php?t=166918

[myHelljumper]

The aircraft is naturally unstable, so if you keep the control surfaces to pitch up you will end up tail first, try to fly the plane with the emergency gain switch to emergency and you will see how it works ;).

[Ala12Rv-watermanpc]

Well, I guess its right then, I just found it "odd" but Im really surprised that taking into account the physical placement of the control surfaces respect the G.C. they need to move almost down to keep a positive g turn, even if the aircraft is unstable by itself if we are talking about a SUSTAINED turn where are the forces of the air flow being reacted then??

 

About the emergency FBW switch I forgot to mention that I already tested with it overriding the FBW and the results are surprisingly the same :huh: ...no much movement even making crazy monouvers (even in a spin) when pulling/pushing the stick...roll however has some BIG movement.

 

Damn, I wish I could find a GOOD video to see how the real thing behaves in this regard...

 

 

thanks guys!

[mvsgas]

Is not the center of gravity by itself. You also have to consider CG relation to the lift center.

VImEvFg3smQ

[Ala12Rv-watermanpc]

thanks a lot for your videos, I see how it works now :)