Stratocaching high altitude balloon flight organisers positive about flight results

The organisers have given us an insight into the organisation of the flight and how well it went on the day.


1. How did the flight go? I watched it but missed the end. Did the seeds deploy correctly and were they found?

The flight was surprisingly smooth, all the electronic systems worked well. The Dropion landed in Cerhovice (we didn’t publish the final descent route online) in a private garden next to a swimming pool All the 12 seeds (10 Stratocache and Radioseeds) got frozen (we still analyze the reason, they had been tested with a meteorological sonde and included a battery pack of Energizer Lithium AAA batteries. But the first seed landed on a garden in Chrást u Plzně and the owner called us. In 10 minutes, 250 “stratocachers arrived! Finally 4 seeds were found – you can see them on – click on Axis, Grafite, BASF and Citroen. You can see the report here:

2. In general terms how were the tv pictures transmitted? Was it SSDV? Did you need special permission to do this from the government?

The video stream was done using IP camera Axis 2014 with a special tunning. We used Microtic router, poE injector an a special antenna – it was a Wi_FI transmittion with a frequence 2397 MHZ (legal if you own the HAM radio licence). We think the fluent video was a kind of miracle. We had one 120cm parabolic antena with an APRS driven rotator at the meteorological observatory (place of the start)

3. Did you need special permission from the Czech civil aviation authority?

Yes, getting the permission from CAA to do this was an experiment of its own…. We had to prove the kinetic energy of all the 93g seeds (descent 2,5 m/s – 5,6 m/s – but only if they rotate!) First prototypes of the seeds were not stabile – the seeds sometimes didnt start the rotation, so we had to make changes in the seed design (14 different designs) – and then we had to show the final design of all 12 seeds to the CAA inspectors by throwing them from a 50m meteorological tower!

4. Will you all be having another go?

As soon as we rest a little bit and analyse the results, we will think of a possible Stratocaching 2 project. There were houndreds of geocachers out there searching for seeds, a lot of fun! When we solve the GPS tracker issue and other issues (special mobille app Stratocaching was not working well, the rules of the game were not ideal…), it will be even better.

Many thanks to the Stratoteam for answering our questions. The whole project reminds me of the MASS EFFECT video game launch promotion, carried out by Project Aether 2 years ago, and the Dutch HAM ‘fox hunt’ game. But the activity is taken to a whole new level. It will be really interesting to see if they iron out some of the technical problems. Questions also arise about the seeds falling on land where the owner does not want hundreds of treasure hunters turning up, but it seems to have been taken in good heart by members of the Czech public. Given the inventive nature of the project, we are nominating it for the BN ‘high 5’ award in this years BN annual awards.







Leave a Reply

Fill in your details below or click an icon to log in: Logo

You are commenting using your account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s