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Designations CY-8
Launch date November 17, 2019
Launch site Brigantino Park, Hollister, CA
Launch coordinates 36.849, -121.433
Flight profile Ground tests
←SSI-93 SSI Balloon Launches

SSI-97 (project designation CY-8) was the seventh launch of Project Cycloon on November 17, 2019. Not a true launch, it was instead a series of ground tests of various properties of polyethylene tubing envelopes and the newly designed Cycloon vent mechanism. It was also the first return of Cycloon to Pigeon Point since the first launch.

Project context


Balloon: 0.8 mil polyethylene tubing, various topologies, width 2.5 m, various lengths and volumes. PVC of length approximately 12 inches and diameter 1/2 inch, as usual.

Avionics: Teensy 3.2 transmitting at adjustable intervals over Rockblock. Vent control.

Power: 3 L91 lithium AA batteries.

Vent: Cycloon zero-pressure

Payload: Half valbal-style polycarbonate cylinder within styrofoam enclosure. Mass 1.25 kg including ballast.

Mass budget: Various

Flight synopsis

Since this was a series of ground tests, no flight synopsis is available. Please see the test report in the Cycloon Google Drive.

Balloon Launches
2014-15 SSI-19202122
2015-16 SSI-23(a) • 2425262728293031323334353637383940414243
2016-17 444546474849505152
2018-19 8386879091
2019-20 929397