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I'm an aviation and electronics enthusiast located in Constance. Always wanted to launch a HAB, hope it'll work.
The Montgolfière was the first manned aircraft in history of mankind, flying up to 2 km high. Today, manned gas balloons can reach up to 20x of that height, let alone unmanned ones. So it's definitely a Montgolfière "on steroids". The heart of the payload will be an Arduino, planned are absolute pressure, GPS, temperature, humidity and UV-intensity sensors and a camera. Telemetry will work over GSM, the whole collected data will be uploaded when the payload gets a signal on descent. As an balloon I'll use an tube film, as known from packaging industry, which will be sealed on both ends and filled with helium.
I'm planning a bigger HAB-project, so experience is valuable and this is still a good challenge.