Turbulence causing nose to go in circles
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I’ve noticed that the nose of the aircraft sort of going in circles when flying in inclement weather like the maverick TE. I’m flying over 800km/h and was thinking if this effect is correct?
Regards
F -
Perhaps i asked the question wrong, how come my nose, or atleast the gun cross start to go left and right but my fpm is still pointing more or less at the same spot.
I just dont get it, if i am going at 400kts and my nose start to point at another direction, shouldnt i end up at a different location? Do the aircraft really sideslip? at those speeds? The Drift C/O is in norm.Regards
F -
Because the airplane weighs 10-20 tons and changing it’s momentum is hard. The attitude is quite delicate by comparison with the wing loading and passive stability being what they are. The difference between the ZSL and the FPM isn’t necessarily aerodynamic either. Theoretically flying through a patch of air moving a different way than before it’s possible to be at no AOA or slip but still be at some alpha and beta from the velocity vector.
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Are you quite sure of that? If the A/C has no alpha and no beta in the relative airflow, the FPM should be pretty much coincident with the gun cross. I’m not having much luck working out an alternate situation like the one you describe. Did I miss something?
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There are angles between the airflow and the nose and there are angles between the velocity vector and the nose.
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Isnt the relative airflow always opposite the FPM?
Angles between the velocity vector and the nose - this is the case unless alpha and beta are zero. Big unless, so it tends to happen most of the time.
Angles between the airflow and the nose - isnt the airflow directly opposite the velocity vector? Doesnt that make both those statements the same thing?
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Hmm. Although in a crosswind, you get wind from one side, and your flight path fixed to the ground is displaced the opposite direction. So I guess you can have an angle between the relative airflow and the FPM.
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In a crosswind from the left, the fpm is showing that I will end up to the right of where my nose is pointing, no problem with that. But when the wind increase, my nose will move left, I don’t understand why it does that.
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That sounds like errant behavior. If the wind increases suddenly, the result should be the FPM moving, not the nose.
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Hmm. Although in a crosswind, you get wind from one side, and your flight path fixed to the ground is displaced the opposite direction. So I guess you can have an angle between the relative airflow and the FPM.
Actually no. In this case the relative airflow is still coming from opposite the velocity vector - however relative to the ground, the entire patch of air is moving, causing the FPM to be displaced. The relative airflow is still opposite VV.
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That sounds like errant behavior. If the wind increases suddenly, the result should be the FPM moving, not the nose.
That is what I thought too, that the fpm would move, but it’s like the aircraft self compensate for the increased wind.
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That is incorrect behavior. The FPM should react to the wind, not the nose. Ill have to see if it does it for me, too…
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That is incorrect behavior. The FPM should react to the wind, not the nose. Ill have to see if it does it for me, too…
It does to me when I go between stp5 &6 in the maverick TE.
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the fpm moves then the aircraft body reacts……
this is how it moves in BMS turbulences…no idea what is describing the OP
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This is when i go between stp 6&7 (wrong in last post):
30 sec in the video you can see that my nose reacts on the wind increase and the fpm is almost not moving, or moving towards the wind. I just dont understand why it does that.
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This is when i go between stp 6&7 (wrong in last post):
30 sec in the video you can see that my nose reacts on the wind increase and the fpm is almost not moving, or moving towards the wind. I just dont understand why it does that.
nothing wrong with that…just normal turbulences…fpm and Body are moving…
The body moves weirdo because the FLCS reacts to the turbulence, so makes the whole Body react differently than natural behaviour would be expected
btw, this weather type looks great
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nothing wrong with that…just normal turbulences…fpm and Body are moving…
The body moves weirdo because the FLCS reacts to the turbulence, so makes the whole Body react differently than natural behaviour would be expected
btw, this weather type looks great
Well, it’s your weather love the way the clods lays over the mountain tops, hard as h*ll to find targets and aim Mavericks though
Is it the FLCS that react to the increased wind as well? At 0:30 and forward there isn’t much turbulence but the wind increases and decreases, if I read it correct, the wind is coming from my left, and as the wind increase my nose is going left, at some point the wind reach 29-30 and as the nose point more left the fpm goes left too. So I don’t have to correct my flight path as the wind increase. I’m sort of flying into the wind without any input. I just thought that the fpm would move right if the wind increase and that I would have to correct my AC to the left. -
at 0:36 , there is a burst from left to right, the FPM moves right with the scale, the noze remains nearly steady, this is expected behavior
be careful with optic effect, this is your FPM scale that moves (many degrees variation) , not your noze (limited to 1 deg…)…check your heading in the head, it remains steady during the burst since the heading is the direction where the noze points
and yes the FLCS compensates from this Beta angle increase by applying a little bit of rudder…small magnitude though
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The FLCS rudder augmentation prevents a slip/slide condition that can cause a Dutch roll. The ac is crabbing witch causes it’s corse to drift from the nose heading. The 16 is more stable in crab than slip/slide’n.
Xwind can cause the nose to change heading depending on the winds change in velocity and vector. Most of the time nose moves only a small amout during a gust because the wind vector is the same however drift increases causing the fpm to move.
Me thinks -
at 0:36 , there is a burst from left to right, the FPM moves right with the scale, the noze remains nearly steady, this is expected behavior
be careful with optic effect, this is your FPM scale that moves (many degrees variation) , not your noze (limited to 1 deg…)…check your heading in the head, it remains steady during the burst since the heading is the direction where the noze points
and yes the FLCS compensates from this Beta angle increase by applying a little bit of rudder…small magnitude though
Lol, thank you Mav, I see that now, it was my eyes fooling me, thanks again for sorting me out.
Regards
F