Just to make it clear the video is in x20 speed starting from a few seconds before 1:15 hahah but I think I see what you mean anyway. Yeah stability is hard, a bit harder with a huge camera (relative to the size of the glider) on the tail too. This launch isn't from Payerne but we have done 10 launches from and back to Payerne a few weeks ago with the support of MeteoSwiss! If you live in the eastern part of Switzerland and like building electronics you might help us by setting up a small ground station capable of receiving the telemetry of the glider. Every now and then we have a small issue with small gliders and having multiple ground stations would help with getting as much data as possible to recover them. Let me know if this sounds exciting (you can get in touch via the form on the website: https:r2ho.me or maybe ytb is sharing my email somewhere)

@@YohanHadji Ah, I missed the part that is is 20x speed. Still, you should get rid of the oscilations.... So, where was the launch from?

the avionics doing the guidance is custom, on most days, you can't use the standard RTH procedure from existing software such as ardupilot/Px4 to return from the stratosphere to a precise landing point

maybe because there are two gliders hahah! That was the whole point of the video but I feel like no one actually got it.. :'-(

Please tell us

who said that hahha?

@@YohanHadji well, 30km altitude and glide ratio 1:20 gets you there

@@ronaldglider We can only dream of 20:1. Reynolds is a git!

@@markpitts5194 Well, I fly gliders from time to time with 1:50 What do you mean by *git?*

Yes

No the avionics doing guidance is custom

Could you do a video on the avionics? Like did you make the software yourself?

Tout est automatique!

When I retire in a few years I'm going to do this

radiosondy.info/sonde_archive.php?sondenumber=U0510118Y radiosondy.info/sonde_archive.php?sondenumber=U3510394Z radiosondy.info/sonde_archive.php?sondenumber=U3510387 radiosondy.info/sonde_archive.php?sondenumber=U3524360

check the description

Yes I see the description of the regs, however a few years ago I barely missed a midair between my airplane and a craft operating under the described regs. Who will be accountable when it happens?

@@YohanHadji flying a weather balloon is one thing, dropping an aircraft from it is completely another.

There is no physical difference between the 800'000 radiosondes that are "dropped" each year all around the world when their weather balloon burst around 30km altitude and my glider. The size and weight is the same. These devices make aviation safer by providing in situ observations of the atmosphere required to make accurate weather forecasts and save lives all around the world (not only saving lives for aviation actually)

- in addition to reducing the number of the (currently unguided) radiosondes which end up landing close to restricted airspace by drifting with the wind which also reduces the risk of mid-air collisions.

We are already flying with radiosondes in the nose!

​@@YohanHadji Vous avez un moyen de modéliser la trajectoire du planeur? Ça peut être utile pour étudier la structure des orages par exemple.

lol. We had positive and then negative 15m/s vertical wind speed in the cell and 40~50m/s horizontal wind speed. The top of the cell was between 10 and 15km altitude and we got hail on the ground

@@YohanHadji ok, that's more like it. From one sailplane pilot to another, next time overlay some vario readout, ok? Otherwise, congratulations!

we have LoRa telemetry, no manual RC control in flight, everything is autonomous :)

@@YohanHadji Awesome!

hahah that's an incredible story! your first jump on a ram air canopy was a solo jump?

@@YohanHadji Of course, this was in the days long before tandem jump rigs were invented. Even modern AFF students are flying their own canopy on their first jump and don't necessarily do any tandem jumps first.