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'''SSI-91''' (project designation '''CY-5''') was the fifth launch of [[Cycloon|Project Cycloon]] on August 5, 2019. It was the second launch of an in-house manufactured polyethylene envelope and the first SSI zero-pressure balloon to report telemetry throughout the flight since [[SSI-20]]. It was also a rare sunset launch, a weekday launch, and featured an even lighter payload than its predecessor, [[SSI-90]].

'''SSI-91''' (project designation '''CY-5''') was the fifth launch of [[Cycloon|Project Cycloon]] on August 5, 2019. It was the second launch of an in-house manufactured polyethylene envelope and the first SSI zero-pressure balloon to report telemetry throughout the flight since [[SSI-20]]. It was also a rare sunset launch, a weekday launch, and featured an even lighter payload than its predecessor, [[SSI-90]]. The payload was recovered on August 31, 2019.

==Project context==

==Project context==