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| img link =
| img link =
| designations = '''CY-3'''
| designations = '''CY-3'''
| launch date =June 1, 2019, 10:20 PDT
| launch date =June 1, 2019, 10:35 PDT
| launch site = Le Grand Elementary School, Le Grand, CA
| launch site = Le Grand Elementary School, Le Grand, CA
| launch coordinates = 37.226, -120.251
| launch coordinates = 37.226, -120.251
==Flight synopsis==
==Flight synopsis==
'''June 1, 2019, 1035 PDT:''' Launch. A fitting between the neck of the balloon and the vent had to be improvised on site. The target ascent rate was 1.7 - 2 m/s, and the flight plan was to equilibrate at 19-22km, with the first vents occurring at 14km.
'''June 1, 2019, 1109 PDT:''' Due to slow ascent of 1.4 - 1.8 m/s, a first ballast command of five seconds was sent.
'''June 1, 2019, 1143 PDT:''' Further 5 seconds of ballast were sent, titrating successfully at 1.7 - 2.2 m/s.
'''June 1, 2019, 1236 PDT:''' First vent command of 5 seconds at an altitude of 14 km.
'''June 1, 2019, 1259 PDT:''' A communications gap was noted due to issues with HABMC. For the remainder of the flight, monitoring was performed through the RockBlock website.
'''June 1, 2019, 1309 PDT:''' In response to consistent ascent, a total of 25 seconds of vent were sent at an altitude of 17.8 km.
'''June 1, 2019, 1324 PDT:''' With ascent still maintaining around 2 m/s, a total of 64 seconds of vent was sent.
'''June 1, 2019, 1334 PDT:''' With ascent only barely below 2 m/s and altitude exceeding 20 km, 96 seconds of vent were sent.
'''June 1, 2019, 1341 PDT:''' 80 seconds of vent were sent, successfully slowing ascent to around 0.8 m/s.
'''June 1, 2019, 1347 PDT:''' 80 more seconds were sent.
'''June 1, 2019, 1355 PDT:''' To play it safe, yet 96 more seconds were sent. Following this, a slight descent was observed after a peak altitude of ___, and equilibration was declared.