Changes

==Configuration==

==Configuration==

'''Balloon''': 0.3 mil polyethylene, paper bag topology, width 1.8 m, length 7.5 m, volume approximately 6.9 cubic meters. Total mass 0.23 kg with fill tube (PVC of length approximately 18 inches and diameter 1/2 inch).

'''Balloon''': 0.3 mil polyethylene, paper bag topology, width 1.8 m, length 7 m, volume approximately 6 cubic meters. Total mass 0.23 kg with fill tube (PVC of length approximately 18 inches and diameter 1/2 inch).

'''Avionics''': CY-3 avionics: BMP 280, TinyGPS, Teensy 3.2 transmitting at adjustable intervals over Rockblock. At the last minute, it was decided to ''not'' include a SPOT Trace. Although communications were perfect leading up to the launch, no transmissions were received after launch.

'''Avionics''': CY-3 avionics: BMP 280, TinyGPS, Teensy 3.2 transmitting at adjustable intervals over Rockblock. At the last minute, it was decided to ''not'' include a SPOT Trace. Although communications were perfect leading up to the launch, no transmissions were received after launch.

'''July 27, 2019, 1246 PDT''': Balloon release with an estimate ascent rate of 2.5 m/s. Due to ground winds being stronger than expected, the orientation of the balloon was nearly sideways at the moment of release, and the payload suffered a hard impact with the ground and was dragged by the balloon for approximately one second before lifting off. In post-analysis, it was determined that this impact likely loosened connections already made vulnerable by the impact at the end of CY-3, in particular the connections to the RockBlock. No transmissions were received after launch.

'''July 27, 2019, 1246 PDT''': Balloon release with an estimate ascent rate of 2.5 m/s. Due to ground winds being stronger than expected, the orientation of the balloon was nearly sideways at the moment of release, and the payload suffered a hard impact with the ground and was dragged by the balloon for approximately one second before lifting off. In post-analysis, it was determined that this impact likely loosened connections already made vulnerable by the impact at the end of CY-3, in particular the connections to the RockBlock. No transmissions were received after launch.

It is expected that the balloon equilibrated at an altitude of 15 km and descended slowly (0.5 m/s) until flight termination.

It is expected that the balloon equilibrated at an altitude of 14-15 km and descended slowly (0.5 m/s) until flight termination.

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[[Category: High Altitude Balloons]][[Category: Balloon Launches]]

[[Category: High Altitude Balloons]][[Category: Balloon Launches]]