Gripen - The Design Chronicles - Part 2 

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I love your videos and you are very knowledgable. But in this case, I have a little advantage, as was in the team that made Gripen. The base problem was simpler. In all aircraft with flight control augmentation, you divide the control authority between the aircraft's augmentation and the pilot (you only have 100% control surface authority to use, measured in deflection angle and deflection rate which creates the aerodynamic force). This is more accentuated in an unstable FBW fighter as the augmentation needs more of the total authority to keep the aircraft from departing. In the first crash (third flight IIRC) the aircraft had too much of the authority and the pilot (Lars R) fought the aircraft, that he felt was flying its way and not his, to control it=PIO. In the August Stockholm case, the dial was the other way. The FBW team had opened up the pilot's authority so the pilot felt in control, but in a very remote corner of the flight envelope (Q, AoA, G), the aircraft got too little authority to control the aircraft. As the aircraft was now departing, the pilot tried to control it = PIO, but now the other way around. Fix was to introduce a selective FBW filter to reduce the pilot's authority a bit in this remote corner of the flight envelope. The aero fix added to the stability as well but the base fix was a digital filter in the FBW.

Legit did not know there's vortex generator strake behind the Gripen's canard. I learn new things every video. Keep up the awesome work!! Loving these videos.

Excellent! I learned more specifics about the Gripen accidents than I've learned from Swedish media in the last 20 years.

One of the more underrated multirole fighters, yet one of the good ones.

This is a highly informative Chanel. Keep it up.

Nice video! Even as a swede interested in aviation i knew nothing about the vortex generators behind the canards. Interesting!

Millennium, you revel small but important details in every video ;)

I am new to the channel, found it by chance. As a former aero engineer, you have re-stimulated my conceptual curiosity in these sorts of topics. I am amazed at how much interesting information you impart in ten to fifteen minutes. Keep providing your videos please. They are unique indeed.

i have to say .. watching all these videos, my respect for the gripen has gone up immensely!

An early version of the F-22 also had a PIO crash. During landing the F-22 suffered from PIO smashing the airframe into the runway leaving a trail of sparks behind it as it skid along the runway. As I remember it they used the same software fix as in Gripen. Don't know if they got it from Saab, or if they fixed it themselves.

Excellent. Stay safe too.

Always interresting listening to you, my friend, for aviation videos. .

I would love to see many countries buy this Aircraft as the price for what you get is far better than the F35, you may need the F35 but you also need a fighter that can be used along with the F35 has done their job. You can buy an Aircraft that you get more bang for your buck which in many cases most countries need, l really like your video’s on the Gripen

You speak english very well. I get your point: in a spin, separated flow over the wings stalled the flow over the rudder making it nearly impossible to regain yaw stability.

Not sure I understand the need for the vortex generators on the Grippen. If the reattached airflow results in asymmetrical dynamics, doesn't that mean the aircraft will fall to one side or the other. Could that be an advantage in a dogfight - unpredictability. Though there would be a lose of altitude. Isn't the most likely flight envelop to be in a hairied dogfight where this would be a concern? But if encountered at low altitude, such as at an airshow recovery altitude might not exist.

India should select Gripen E in MMRCA 2. Gripens are marvel of engineering, highly capable and reliable.

a quick fix for low stalling speed but what is the stalling speed and angle now?

I would like to see a video on one of the predecessor for the Gripen, the J35. Also it was the first aircraft capable of cobra manuever.

Good content

Any idea how the ngf or tempest will keep the advantages of the canards without them (for stealth reasons) ?

Cool!

Gripan have any dog fighting and land attack record other pls information macj video

Gripen for Canada!

Cool👍🏻

good stuff Millenium 7, but this video didn't seem to follow on directly from Part 1 - and bring us thru the development process to certification / operational status. Would really be interested in hearing you discuss the evolution of the Gripen from the A/B to the C/D to the current E/F configurations. I think I speak for everyone in also wanting to see a comparison of the current Eurocanards. Lots of Gripen fanboys because I think everyone likes to root for the little guy - but having watched your other videos discussing the 3 Eurocanards you seem to favor the Rafale if cost was not a consideration. Still, I'm not sure as you've seemingly refrained from definitively naming your favorite - though i think you did refer to the Rafale as the delta wing king?

Delta cannard configuration, unstable flatform, latest airborne phase array fashioned early detection electronic sweep. Now we know who's real boss in the sky.

Para nós aqui do Brasil isso já parece filme de ficção científica kkkk quando chegarem vão estar velhinhos com teia de aranha

Like wat you doing. Did you know that Saab Drarken did the cobra?

Thank you for your video, you appear to really know your aerodynamics, my only advice is that as you are not a native english speaker, to make use of one of the internet word pronunciation sites, it took me until your third mention to get that you were saying "hysteresis".

ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-jqiDEcfSnXs.html parré manoeuvre, later called cobra. Used to enter superstall for pilots training to handle it, also found useful to make an opponent overshoot. The first do a successful cobra, the second not so much and the third seems actually to fail exit and enter a superstall.

Very informative video. Please upload one video for one topic and not in parts, it is a request. Good job 👍 keep it up. HAPPY EASTER.

4:43 It looks like Ikea made the wind tunnel fan blades.

Has gripen been to war?

You have been making to much quality content. I feel guilty about the ones that I haven't watched.

Gripen Gripen is okay nice plane but what about the TEJAS??? 😂😂

Any update's on HAL Tejas Mk 1A video

Argh, not the epic music montage!!!