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| header = SSI-87
| header = SSI-87
| img link =
| img link =
| designations =
| designations = '''CY-3'''
| launch date =
| launch date =June 1, 2019, 10:20 PDT
| launch site =
| launch site = Le Grand Elementary School, Le Grand, CA
| launch coordinates =
| launch coordinates = 37.226, -120.251
| flight duration =
| flight duration =
| flight length =
| flight length =
| flight profile =
| flight profile = Ballast and vent control
| landing time =
| landing time =
| landing site=
| landing site=
| landing coordinates =
| landing coordinates =
| last = 86
| last = 87
| next = 90
| next = 89
}}
}}
'''SSI-87''' (project designation '''CY-3''') was the third launch of [[Cycloon|Project Cycloon]] on June 1, 2019. It featured a legacy ballast and vent mechanism from ValBal operated by Cycloon avionics and was the first such fully controlled Cycloon flight. The mission was noted for its eventful manual equilibration, early termination, and for being the last latex Cycloon before the project transitioned to polyethylene.
==Project context==
==Configuration==
==Configuration==