- Jul 15, 2015
- Reaction score
OK, flew my 2.6 fiberglass Tomach this weekend on an H120. Flight altitude was within 4% of OR prediction. Cross winds were 12-15mph at launch. Flight was BEAUTIFUL!!! Straight up, visible apogee lay over, smooth separation, nice initial fall with good airframe separation, and main deployment was text book. I FINALLY got the combo of harness length, separation charge, and shear pin set up working!
Data, not so much. I was using this battery: https://hobbyking.com/en_us/turnigy...-lipo-pack-fits-nine-eagles-solo-pro-180.html , which I've never had an issue with. The three previous flights on this RRC3 all presented text book data files. The only thing that's really different on this flight was the relatively higher winds below about 500ft.
As you can see, somewhere about 27 seconds into the flight, the voltage dipped significantly, which usually coincides with the main charge firing. This time, it precedes the main charge fire by about 1 second. Battery came right off the charger at 4.2v about 5 hours before the flight.
Somewhere about 300ft AGL during descent, data just stops, which I suspect is why it did not compute Main Rate. Upon recovery of the airframe on the ground, the altimeter was beeping out altitude as expected.
What happened to the data? Do you think that the high winds caused the funky data and failure to report below 300ft? Perhaps the low voltage spike should have coincided with the main charge deployment? Perhaps the low voltage spike somehow messed with the data logging?