New lower price for Axon II ($78) and Axon Mote ($58).
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did i hear correctly on the video that the GPS failure was due in part to the GPS being in ground vs aviation mode?
i'm surprised to see how linear the rise speed was.i guess drag must be roughly proportional to the expanding balloon size as the altitude increases.was this because of careful calculation of the balloon size or is that just how these graphs tend to look?
i also would not have expected to see such a large temperature rise high up.i'm guessing this is due to the reduced thermal conductivity of the atmosphere but increased heat radiation (ie. sunlight).
it would be interesting to see if you can rig a temperature sensor in the "shade" on the next one to see if this is a true representation of the air temperature or just the effect of sunlight on the probe.
were you able to correlate the lowest temperature point with any particular weather phenomena on the film?was that where it broke free of cloud? the lowest temperature was slightly warmer on the descent. do you think this was due to air friction or residual heat in the sensor?
2 interesting sensors for next time:air pressure and humidity. both these variables have a large effect on the conductivity of air so would compliment the temperature data.
i'd love to build a controllable airframe that could return to base for this sort of project....
I read that you used an on board data logger. What type did you use and did you use it with the axon II? Where can i buy one? Can i dump the data in excel or does it have a program it works with?
I have code I can give you when you're ready. It easily dumps into excel.
That's pretty cool . Do you have to file a flight plan or anything with the state or federal gvt to launch something like that ?