Return To Home from the Stratosphere
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- Опубліковано 21 сер 2024
- (Thumbnail by Darrin Vanselow for PME)
Regulations: The system is considered as a normal radiosonde/weather balloon in Switzerland and in the US already. Thus the same rules as for normal radiosondes applies. In Switzerland, no special permission is required to launch a balloon with a payload of less than 2kg, and a volume of less than 30m^3, from more than 5km away from any airport or restricted area. A special insurance is required for payloads of more than 500g. More than 800'000 radiosonde of similar weight and size are launched every year all around the world.
What is it? This is a 240g glider returning to home after releasing from a weather balloon at 30'000m altitude. The ascent time is 100min and the descent time between 35 and 45min depending on the day. The landing accuracy is roughly 30m. The glider is completely autonomous.
Project update: after 5 years of work. The technical challenge is solved. The reusable radiosonde is ready. After exploring guided parachutes for 4 years it that appears the added complexity of the parachute deployment is a bit too high.
I integrated all the software and electronics developed for the guided parachute in an ultralight glider: small and light enough to fit in the same category as standard radiosondes, yet smart enough to come back to launch site on most days.
More infos about the next step soon here: r2ho.me
Daft Punk's tribute was a great choice.
Two observations:
At high altitude the control loop gain was a bit high and the damping low, you may want to adjust the PID gains vs altitude.
If it can sense AGL you could add a flare to reduce landing speed.
yes! very good observations for both. These are actually the two main point we'll be working on this summer.
For PIDs the best would probably be to do a system identification as function of altitude and then start from there.
To "sense" AGL, doing a good sensor fusion between GPS and baro and knowing the precise GPS ground altitude should be enough (I hope). Currently the final landing approach is not at all optimized.
@@YohanHadji
In thinner air with high true airspeed the natural aerodynamic damping is reduced, so perhaps just increasing the D term would be enough to calm the loop down. You might be able to use a sim like X-plane to tune the gains.
I agree that sensor fusion is the zero mass solution for landing but I know from bitter experience (crushed vertebra in a skydiving landing mishap) that the altitude precision needed is well under a meter. Perhaps an ultrasound rangefinder at just a few grams would be worthwhile.
@@YohanHadji It could be Dutch-roll too at that altitude - they outfitted the Perlan2 with a yaw damper for that reason. You could just increase the size of the vertical fin/rudder. (Double the area - it would increase the drag slightly, but would help everywhere else).
Excellent!
Shame you used a fisheye lense
Man
This drift and you are absolute legends for this. Genuilly incredible footage
Go touch grass
You are gushing over a self appointed you tube channel that uses fish eye lens, and therefore doesn’t offer anything to anyone unless you are gushing over fantasy
Well done, mate. The four years weren't wasted, by any means!
Impressive, you can see the roundness of the earth when the glider is at ~30km. (And it's not only the wide angle cam that makes it, you see it's more round when in altitude than when it's lower)
Great work !!!
I'm still sure the Earth is flat. And I always will be.
@@DrewWithington I don't doubt it.
@@DrewWithingtonYour IQ bell curve is flat 😂
Ya that's how we know this is fake news because the real earth as we all know is flat.
@@DrewWithington . You are sooo right, and now its time for your medicine and sleep.
Amazing job! I admire your dedication to making this work. It's an impressive accomplishment.
Awesome! I can't believe you were able to find the field from that altitude. I have a hard time finding my field when I'm just looking at a map of my town! 🤣
oh, it's all autonomous! I didn't have to do anything during the flight!
"My name is Giovanni giorgio, but everybody calls me Giorgio..."😉
Tune!!
😂
Mi name is Paco y my mother call me to eat PACOmé
Wow big success! I am amazed by your work
I can't believe you got Werner Herzog to narrate. Amazing.
That's giorgio moroder! Not Werner haha!
Wibbly wobbly fish eye creating that imaginary curve! 😂
Amazing, you're a genius ! Greetings from France
Fascinating. This reminds me of the Balloon project I used to follow many years ago, but without the searching part.
Great Work! I appreciate the "70s tech documentation"-vibe the music adds to the video.
Wow this is the best video I've ever seen on UA-cam.
Great job! That’s some serious scientific capabilities with little cost.
Also, what is the velocity after the release and the plane accelerated in the low atmospheric pressure? I assume the drag to mass ratio is low compared to ground level. How many minutes return to home, from what altitude?
About 90~100m/s forward speed right after release at 29km altitude
Between 35 and 45min to come back home depending on the day, from 30km altitude
Thank you for the reply. An amazing endeavor!
Incredible!
Yes please do something like this our fog plane tutorials and teach how to make an ataunomouse plane
henlo
I love when the fisheye lens makes it look like for a second the earth is concave 😮
😂🤣😂🤣
No more parachutes!
Incredible work, congratulations 👍👏👏👏
What, no aerobatics? I would have been looping all the way down. Still, way cool and a great low cost solution. A friend of mine made a flight like this back in the 90s for NASA. They used one of those huge aerostat balloons. Total costs were in the hundreds of thousands. This is better.
Great video and what a fantastic achievement!👍
This song is thumping. Nicely done
Congratulations! Amazing job!
That was just Amazing!!!
Nice, perfect music selection as well ⭐
Awesome!
Very impressive!
very, very impressive.
Yeah some perfect contrails up there ........ The Dimming ......
Great Project though , top marks
Great choice of Music ;)
Excellent ! Bravo
Zohd Drift, good choice, speedy bee F7 FC? Great shots!
Einfach der Hammer, Spitze Bilder, sehr gute Stabilität.
@scimandan here's a relatively low cost experiment :)
This is Super Cool. Congratulations on successful flight! I just came across your post on Twitter. I'll definitely be watching for more videos on this.
What was total flight time? Take off to touchdown. Or start of descent to touchdown?
About 1h40 minute for ascent to 30'000m and between 30min to 50min for the descent depending on the wind profile of the day!
You should name it C.H.E.M. (Chem-trail High Elevation Marker), great flight too!
This is fascinating!
Magnifique travail, félicitations...j'avais ce projet en tête après mon lancement de mon projet Apollo strato..en 2019....tu es un génie 😉
Such a cool project
Look at that beautiful CURVED horizon
Congratulations, that is quite a feat.
I remember RCExplorer/David Windestål doing something along these lines back in the day, but was using analogue FPV which was damaged when releasing from the balloon so wasn’t able to successfully land. I thought with the strict rules that came into force since then that we’d not see another attempt let alone a successful one :)
David has been an inspiration for a long time
@@YohanHadji To us all. I still fly a V4 Tri, Old as hell, can’t get the configuration software to work any more, but still flies beautifully. I did get a LR kit before he stopped selling them, i really need to get around to building that up with a modern FC
tarik in shambles rn
Amazing video! Let's see more!
Ups... you crossed the International flight zone. did you get the aggreement of the flight Control Center. ? If Not It was a high risk for Airplanes and probably illegal. This is one of the reasons for ever stricter laws.
@@RCFlyingDoc 250 grams loser
This ultralight glider is considered as a standard radiosonde by aviation authorities at least in Switzerland and in the US.
800'000 radiosondes with similar weight and size are launched everywhere all around the world crossing air traffic all the time. This glider reduces the risk of an unguided radiosonde landing on an airport.
@@YohanHadjiVery cool point, there. I know weather radiosondes are cheap(ish) but using gliders would make the electronics reusable for multiple flights. I don’t know the actual figures, but we must be sending dozens of those things up every single day. It does seem a waste.
P.S. for anyone wondering if those weather radiosondes could fall on someone’s head or end up crashing into a car’s windscreen on the highway, yes they sure could! Luckily, they’re usually inside a block of styrofoam so don’t come down very quickly, and only weigh 100g or so, so not really dangerous.
Nerdtastic ! 😊😊😊
That is great.
Question: what is the weight of the glider airframe, compared to the weight of the steerable parachute?
Excellent.....
My eyes applaud you. My ears punch you in face.
What a "wonderful" chem-sky.........
Could you program in an initial dive to achieve mach 1? It would be sweet to go supersonic!
Well, I have to admit that putting a fc on a glider, dropping it from a baloon using RTH is as good as an idea as the song Giorgio from Random Access Memories of Daft Punk is. The footage is damn cool and the drums in this song blast.
You can really see how thin the atmosphere is up ther by these aileron oszilations with full deflection and the whobbling of the plane. I really am inspired. Lidl Glider go space? 😂 How is the law for dropping something that flies down spiraling to the home destination through all flight levels? And lifting this up by a baloon in your backyard?
haha this is a bit more complexe than just putting a FC and using RTH, standard RTH won't work, I have a custom board in the glider doing all the guidance. I just updated the description with infos about the regulation :)
Great achievement! 🎉
I apologise, all i can hear watching this video is "i need your boots, your jacket and your motorcycle" 😂
Great video though.
Love this one ! , thx for sharing !
look theres a curve flat earthers 0 curved earth1
Spot on. But...this is cgi remember? Flerfs...denial is key. Gotta lie to flerf 😅
Fun fact: a U2 spy plane has such a shallow glide slope that were one to suffer an engine failure over the UK, it could glide all the way to Florida and land safely… so suppose one were to build a glider whose wings were endowed with the largest aspect ratio structurally feasible, equip it with photovoltaics and a chonky battery as well as arduPilot. Could it say, fly a waypoint mission that brings tens of thousands of kilometers from where it was launched?
Who cares about data / facts, right? The U2 has a glide ratio of 23:1 and a service ceiling 90000' (17 miles), giving it a best possible glide range of 380-390 miles, or around 9% of the 4200 miles from UK to Florida. You were pretty close lol.
Such a powered fixed-wing drone has been flown with photovoltaics. Flight(s) lasting over 2 months in duration have been accomplished. It climbs and charges battery during day, which extends flight into overnight hours of darkness while slowly descending on reduced power. With both chemical and potential energy storage reduced, as sun raises, it repeats the cycle.
To learn more look up "Zephyr solar-powered drone".
So cool, gets my brain thinking!
How about sucking the helium/hydrogen from the balloon into an onboard canister and reeling the balloon back into the plane? And run the electronics on solar and capacitors. Then it wouldn't have any operating costs other than maintenance right?
Awesome! 👍🙂
awesome work.
Great work!
this is awesome. How are you maintaining telemetry/video transmission at such high distances?
there is no video transmission, it's all autonomous
Well done dude 👏
0:13 Lake Geneva / Léman / Genfersee / Lago Lemano
This could be a music video
Нужно выше, выше! Чтобы как у Маска воздух раскалил фюзеляж!)
good music choice!
.....
Awesome 😊
Great video...👍
I have a suggestion: if the glider could be attached with a suitable bridle (like the bridle of a kite) then it could steer on the ascent. So that on the descent it would not have such a distance to travel horizontally, for a given wind speed.
Ascent is going with the wind and updrafts etc, so, no.
@@logic.and.reasoning I had a message from the project. The drag due to the balloon would make it not so worthwhile to do on ascent.
Well done!
Pretty awesome!!
everywhere chemtrails..😮
Lets goooo!
Telemetry would have been interesting to view
This looks like it will soon be used in war...
Amazing. You started somewhere north of Lausanne and the balloon drifted all the way to Valais... And all the way back with a fragile ZOHD Drift :-)
How long was the ascent, time and altitude wise?
Exceptional work, and a truly impressive effort to recover expensive electronics packages by using great flight programming.
Also, kickass music!
Quote from 0:20: "Once you free your mind about the harmony and of music being correct, you can do whatever you want so nobody told me what to do and there was no preconception of what to do". What? That sounds like Werner Herzog on acid. Dude, you tied a balloon to a glider lol.
lol that's giorgio moroder, from Daft Punk, it's from the original music
Incredible
Pitty the gopro fisheye lens.. see everything distorted, especially the horizon. Next time cam up want to see the touch of the firmament 😂
Awesome
Give it about 10 years time then to do a few orbits and land at the same spot.
30km? And here I can't legally fly over 400'
YES !!! Super ❤💫
Great work. How did you determine that high altitude wind (jet stream) would make it difficult for a successful recovery?
amazing. (amazeballs)
My name is Yohan Hadji, but everyone calls me Giorgio 😂
guided drive with tungsten rod next time :)
Impressive.
What is the theoretical distance this glider could fly from that altitude?
Without wind, on about 150~180km from 30km altitude. Going back against wind it already came back from 80km distance from the same altitude.
Do you think you might be able to work into one of your next videos the line "GET TO THE CHOPPAH, NOW!" or "Who is your daddy and what does he do?" It would be much appreciated.
lol, will try
Fantastic
I didn’t know you could connect a transmitter to a plane from that distance. Was the flight back to the ground controlled the whole way down?
It's all autonomous
🙏🏽 may i please have any of the following data from your work on this project? the average wind speed and temperature at 30km up, wing span, gps model, lipo or lion, 2s or 3s, amount of helium used for 240g to launch? 🙌🏽 wonderful project!
banger
Fantastique ! 🤩👏💪
Exceptional flight! Great research on radiosonde regulations and criteria that made this possible. Have had similar idea, but understanding all the airspace and technical limitation made me question. I'll definitely be watching for more videos. Subscribed.
Are you able to track telemetry in real-time during any part of flight? With over a 30km range, realize there are some challenges. Even if can't acquire live data feed, it would be interesting to collect radiosonde data both on accent and decent.
Thanks! Yes, the regulatory part is a big part of the project! Doing something that works but isn't permitted to fly would have been almost useless for me (but still fun maybe :). We have full telemetry of the glider in flight using LoRa radios. The radiosonde still has its own radio. The data rate is very low but that's enough to know where the glider is and make sure everything is fine. Using a simple wire antenna in the glider and a patch antenna on the ground we've already had 80+km range without any problem. It works very well because it's direct line of sight communication.
We also plan on collecting radiosonde data from the descent, but integrating it into forecasting models will take some time as the sensors are calibrated for ascent with corrections based on some assumptions which are not necessarily valid anymore during descent.
I would love to read more about your interpretation of regulations that allows this, especially how model aircraft rules apply, as opposed to balloon rules.
This is not my interpretation, this is the interpretation of people from the FAA and FOCA and hopefully others soon.
@@YohanHadjigreat! Would love to see documentation of this, since my understanding has been that controlled flight needs to be licensed, except hobbyist RC flying, which must be under 400 feet in the US.
@@YohanHadji Thank you for the additional information. Great professional and pragmatic approach to collecting radiosonde data.
In regards to integrating data into forecasting models from radiosonde descent, you might look at how satellite radiosonde data (LiDAR samplings) as a reference as it's also a top-down sampling.
This is so damn cool! Whats the max distance it could glide back to home?
It depends on a lot of factors but returns from 80km distance (distance at release from the balloon at 30km altitude) have already been achieved.
Incroyable travail. Le comportement du planeur à très (très) haute altitude est complexe. Cest là où on comprend que ton projet est complexe. Petite question, comment géres tu le décrochage et la vitesse ?
Il faut laisser plus de temps à haute altitude au planeur pour prendre de la vitesse. Les gains de contrôle doivent être ajustées avec la vitesse. La vitesse air peut être déduite de la vitesse sol et du vent mesuré à la montée.
How spherical our flat earth looks!