Understanding Aircraft Dynamic Stability, Phugoid Oscillation, Spiral Stability & Dutch Roll!

[@DerAua]

"Dynamic Stability is the Aircraft's response over time." Best definition I ever heard.

[@JxJAVIATION]

Cool!

[@pravisankar8177]

S sir

[@arfloctions5313]

Nice video. But wrong explanation at 3:25. When the aircraft is put into a roll on either side, the yaw happens on the opposite side. Which is why it's called the adverse yaw. This is because the drag on the high wing (which is the right wing if you are turning left) is higher as angle of attack/camber is higher for this high wing. This causes the high wing to move slower than the low wing, causing the plane to yaw towards the side of the high wing (which is right if you are turning left). What the speaker is referring to here is the changes to the horizontal and vertical component of the lift vector as the plane tilts, and that produces a sideways force to make the plane GO LEFT, not turn left. This horizontal component of the lift acts on the Center of Lift of the plane. Which is precisely why you are taught to apply coordinated rudder when turning to counteract this adverse yaw. This is more pronounced in sailplanes. Keep that ball in the center, people, so your butt is pushed down into the seat, and not to one side. 🛩️

[@JxJAVIATION]

Cool. Thank You for the explanation!

[@manaoharsam4211]

Covered entire two chapters in one 6 minute video. Good teacher. I suggest break it down into say 6 videos.

[@JxJAVIATION]

Wow thank you! will note that down

[@rashedsharierornob5640]

nice video man.keep it up. best wishes and keep uploading aviation study related videos.really helpful.thank you.

[@JxJAVIATION]

thank you!

[@aGabay]

Nice video! I have one remark - swept back wings and dihedral angles can make the dutch roll mode even worse due to the dihedral effect (which is the interconnection between roll and yaw). To eliminate dutch roll, the pilot needs to make slight rudder inputs, sometimes so slight that he can't really perform it. That's why swept back winged airplanes have a yaw damper, which is a part of the flight control system/autopilot (whatever you like to call it). It makes all the needed inputs and provides a safer and smoother flight, transparent to the pilot.

[@JxJAVIATION]

Thank you for the information!

[@spencerjohnson7103]

Great explanations, thanks!

[@JxJAVIATION]

You're welcome! :)

[@Scopi123]

Concept clear after watching this video

[@JxJAVIATION]

That's great! Check out my other videos as well!

[@EveryHowVideos]

Nice video.. hw do u make this animation?

[@mahdiparvizi8113]

Thanks for your nice explane✌️

[@JxJAVIATION]

My pleasure

[@amiradnanjalilvand2907]

Great 💯👌

[@JxJAVIATION]

Thank you. Check out my other videos as well!

[@alexwalton8951]

would you do some questions like If it is desired that the damping constant and undamped natural frequency of the aircraft’s Dutch roll should be 0.6 and 1.4 rad/s respectively, determine the state feedback matix, K, to achieve this using either Matlab or theoretical calculations.

[@juliaquejadacuesta4110]

thanks!

[@JxJAVIATION]

Thank you! Check out my other videos as well!

[@OmkarSheral]

should have talked more about how to improve the stability then what is stability

[@JxJAVIATION]

I will a different video for it!

[@OmkarSheral]

@@JxJAVIATION would really appreciate it. bdw really like your way of explaining

[@JxJAVIATION]

@@OmkarSheral Thank you! Do check out my other videos as well! :)

[@mdmahtabkhan8753]

Sir, plz make the video of Bernoulli's principal

[@JxJAVIATION]

Noted!

[@aryanmishra5591]

At 3:31 I don't understand how the leftward yaw is happening. Shouldn't it be in opposite direction if explained by adverse yaw.

[@JxJAVIATION]

This is case of yaw due to a roll. The Lift Vector gets tilted towards the left so there is a horizontal component of the lift that tends to yaw the aircraft.

[@allsaintskidda]

@@JxJAVIATION Just to help this is actually the opposite. It's called adverse yaw. If an aircraft rolls to the left, the left aileron will be up and the right aileron down, this produces a forward component of lift on the left wing. Meaning left roll creates right yaw.

[@God-nr5oe]

@@allsaintskidda Just curious: This is in the case of a disturbance from a non-control surface. Would the same still apply?

[@andrewkazungu6542]

Continue 🇹🇿🎤🎧♥️

[@JxJAVIATION]

Cool!

[@jayanmangattukunnel5875]

Here the CG refers to the CG of aircraft body or the wing? 🤔

[@JxJAVIATION]

The Aircraft

[@jayanmangattukunnel5875]

@@JxJAVIATION Thanks a lot 🙏

[@astroxturbo815]

I can't understand what you said at around 3:47 to 3:48 because of your accent and there is no captions: you said "the flight path after the lateral ?????" than you said a word which I did can't figure out because of your accent. I mean no offense but what was it that you said? because that word is throwing me off, I can't understand what's going on. Anyways if you can get back to me that would be great. Love your videos!

[@JxJAVIATION]

The sentence is: the flight path, after a lateral disturbance, would look like this!!. thanks for watching. do watch other videos on my channel!

[@astroxturbo815]

@@JxJAVIATION thx, I figured it out after posting the comment Lol. I connected the dots. Anways thx though, I will watch your aviation videos.

[@JxJAVIATION]

@@astroxturbo815 Thank You!! and do share the videos with others as well!

[@xNecromancerxxx]

That damn stublity…….

[@JxJAVIATION]

Yes!