SSI-91
| SSI-91 | ||||
|---|---|---|---|---|
| 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-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
Configuration
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
August 5 20:11 PDT:
| Balloon Launches | |
|---|---|
| 2014-15 | SSI-19 • 20 • 21 • 22 |
| 2015-16 | SSI-23(a) • 24 • 25 • 26 • 27 • 28 • 29 • 30 • 31 • 32 • 33 • 34 • 35 • 36 • 37 • 38 • 39 • 40 • 41 • 42 • 43 |
| 2016-17 | 44 • 45 • 46 • 47 • 48 • 49 • 50 • 51 • 52 |
| 2017-18 | |
| 2018-19 | 83 • 86 • 87 • 90 • 91 |
| 2019-20 | 92 • 93 • 97 |
| V • E | |