Difference between revisions of "SSI-91"

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Revision as of 16:17, 11 August 2019

Designations CY-5
Launch date August 5, 2019, 20:11 PDT
Launch site Brigantino Park, Hollister, CA
Launch coordinates 36.8491, -121.4338
Flight duration 2h:00m
Flight length 94 km
Flight profile Standard zero-pressure
Landing time August 5, 2019, 22:11 PDT
Landing site 5 km NW of Vernalis, San Joaquin County, CA
Landing coordinates 37.6634, -121.3217
←SSI-90 SSI Balloon Launches

SSI-91 (project designation CY-5) was the fifth launch of 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. It was also a rare sunset launch and featured an even lighter payload than its predecessor, SSI-90.

Project context


Balloon: 0.3 mil polyethylene, paper bag topology, width 1.8 m, length 7 m, volume approximately 6 cubic meters. Total mass 0.26 kg with fill tube (PVC of length approximately 12 inches and diameter 1/2 inch).

Avionics: TinyGPS, Teensy 3.2 transmitting at adjustable intervals over Rockblock. SPOT Trace.

Power: 9 L91 lithium AA batteries. Resistive heater running on single L91 battery.

Payload: Styrofoam enclosure. Mass 0.62 kg.

Mass budget: 0.88 kg total.

Flight synopsis

Mission trajectory
Balloon ascending after release

August 5 20:11 PDT:

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