The BLT33.7 flight was certainly a success, but there are some things we need to improve in the future. The GPS produces quite a few erratic data-points and I’m still not sure where this comes from. Is it the permanent off- and on switching of the module? Or is it my code that does a wrong interpretation? The quality of signal doesn’t seem to be an issue because I’ve seen up to 11 satellites being reported while the positions were erratic. At least I should capture those random jumps in my code and re-acquire a new position the next time. Also it seems like we’ve had at least some loss of helium so that the nightfall caused a complete touchdown. The speed of descent was approximately 0.75 m/s so that this was likely not a burst. We may need to find a way to stress relieve the neck and the maybe find a way to check for miniature gas leaks.
Below are some pictures from the fuzzy original data and after removing obviously erratic data points:
The flight data have been added to the UKHAS Wiki for microballoons.