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| header = SSI-83
| header = SSI-83
| img link = File:Ssi83small.png
| img link = File:Ssi83small.png
| designations = '''CY-1'''
| launch date =April 17, 2019, 22:30 PDT
| launch date =April 17, 2019, 22:30 PDT
| launch site = Pigeon Point Light Station, Pescadero, CA
| launch site = Pigeon Point Light Station, Pescadero, CA
| flight length = 267 km
| flight length = 267 km
| flight profile = Marine tether
| flight profile = Marine tether
| last contact = April 20, 2019, 11:03 PDT
| last location = 13.7 km WSW of Point Buchon, San Luis Obispo County, CA
| last coordinates = 35.2168, -121.0458
| last coordinates = 35.2168, -121.0458
| landing date =
| landing date =
| landing coordinates =
| landing coordinates =
}}
}}
'''SSI-83''' (project designation '''CY-1''') was the maiden launch of Project Cycloon on April 17, 2019. A proof-of-concept of Cycloon's aero-marine platform architecture, it was the first marine-tether profile launch in SSI's history. It was also a rare nighttime launch, a rare weekday launch, and the first-ever launch from Pigeon Point Light Station.
'''SSI-83''' (project designation '''CY-1''') was the maiden launch of [[Cycloon|Project Cycloon]] on April 17, 2019. A proof-of-concept of Cycloon's aero-marine platform architecture, it was the first marine-tether profile launch in SSI's history. It was also a rare nighttime launch, a rare weekday launch, and the first-ever launch from Pigeon Point Light Station.
==Pre-Launch==
==Project context==
Discussions of Cycloon's maiden launch had been underway since shortly after the project's inception in January 2019. It was initially envisioned that the HF transceiver system would be first tested via a ground-tethered balloon in February 2019, followed by a demonstration of the marine tether in March. However, as progress on the HF transceiver stalled, partly due to supply-chain delays, it was decided to move forward with the marine tether launch.
Discussions of Cycloon's maiden launch had been underway since shortly after the project's inception in January 2019. It was initially envisioned that the HF transceiver system would be first tested via a ground-tethered balloon in February 2019, followed by a demonstration of the marine tether in March. However, as progress on the HF transceiver stalled, partly due to supply-chain delays, it was decided to move forward with the marine tether launch.