This may be the last report from Team Ballooino before launch.
The payload is finsished now and has a weight of 276 grams + chute 11 grams + balloon 200 grams + ropes 12 g. So its less than 500 grams for the complete train.
We also made a crash test with 8 meters free fall (without parachute) on the lawn.
Result: All systems working, nothing damaged, only the HD video cam slipped a few centimeters into the box, this will be prevented next time by some styrofoam support.
The last hurdle to overcome was the short operating time of the upward looking keycam, but now we achieve 180 minutes recording time with one Lithium AAA cell and a 4V step-up converter. May be it will be shorter in the cold, but at least we want to record the burst of the balloon and the opening of the parachute after estimated 1 hour flight time.
We also learned that the Venus GPS needs a supercap for backup, otherwise changing the battery will cause a cold start oft the GPS (new fix needed) which may result in some minutes delay to launch.
The launch will take place on the 11th of April 0800 UTC. Estimated burst altitude 20 km, estimated flight duration 2h.