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[[File:Cycloon.png|400px|thumb|Project components]]
[[File:Cycloon.png|400px|thumb|Project components]]
'''Project Cycloon''' ({{slack-channel|balloons-cycloon}}) is a core project on SSI's [[Balloons]] team with the aim of designing and operating altitude-controlled, long-endurance, aero-marine balloon platforms for tropical cyclone research. Begun in January 2019, Cycloon has launched five payloads as of August 2019 and has deployed proof-of-concepts of several novel techniques in high-altitude ballooning, as well as giving rise to [[HABSIM]]. Please contact the current co-leads of Cycloon, {{slack-user|bjing}} and {{slack-user|jtang}}, to get involved!
'''Project Cycloon''' ({{slack-channel|balloons-cycloon}}) is a core project on SSI's [[Balloons]] team with the aim of designing and operating altitude-controlled, long-endurance, aero-marine balloon platforms for tropical cyclone research. Begun in January 2019, Cycloon has launched five payloads as of August 2019 and has deployed proof-of-concepts of several novel techniques in high-altitude ballooning, as well as giving rise to [[HABSIM]]. Please contact the current lead of Cycloon, {{slack-user|sunet-id = hagop|display-name=Hagop Chinchinian}}, to get involved!
All flight code, simulations, communications protocols, and flight data/analysis for Cycloon are maintained on [https://github.com/stanford-ssi/cycloon GitHub] and repository notifications arrive in {{slack-channel|balloons-cy-git}}. The flight control channel is {{slack-channel|balloons-cy-flops}}.
All flight code, simulations, communications protocols, and flight data/analysis for Cycloon are maintained on [https://github.com/stanford-ssi/cycloon GitHub] and repository notifications arrive in {{slack-channel|balloons-cy-git}}. The flight control channel is {{slack-channel|balloons-cy-flops}}.
*'''Marine tether:''' In order to extend the flight endurance beyond the inherent limitations of latex, Cycloon is developing an tether and floater to rest on the surface of the ocean for days at a time. This architecture was successfully demonstrated in [[SSI-83|CY-1]].
*'''Marine tether:''' In order to extend the flight endurance beyond the inherent limitations of latex, Cycloon is developing an tether and floater to rest on the surface of the ocean for days at a time. This architecture was successfully demonstrated in [[SSI-83|CY-1]].
*'''Simulations:''' The need to predict trajectories from California to the Pacific and Atlantic topical basins using the GEFS forecast ensemble has given rise to [[HABSIM]] and its associated work. See also {{slack-channel|balloons-cy-sims}}.
*'''Simulations:''' The need to predict trajectories from California to the Pacific and Atlantic topical basins using the GEFS forecast ensemble has given rise to [[HABSIM]] and its associated work. See also {{slack-channel|balloons-cy-sims}}.
*'''Payload:''' Ultimately, the purpose of the balloon platform will be to carry low-cost, lightweight radiosondes. See {{slack-channel|balloons-cy-payload}}.
*'''Payload:''' Ultimately, the purpose of the balloon platform will be to carry low-cost, lightweight radiosondes. See {{slack-channel|balloons-cy-dropsonde}}.
*'''Communications:''' To augment data uplink rates, Cycloon is developing a skywave communications system and protocol in {{slack-channel|balloons-cy-comms}}.
*'''Communications:''' To augment data uplink rates, Cycloon is developing a skywave communications system and protocol in {{slack-channel|balloons-cy-comms}}.
*'''Avionics:''' Core avionics work involving circuit board design and flight code is undertaken in {{slack-channel|balloons-cy-avionics}}.
*'''Avionics:''' Core avionics work involving circuit board design and flight code is undertaken in {{slack-channel|balloons-cy-avionics}}.
| April 17, 2019
| April 17, 2019
| Pigeon Point
| Pigeon Point
| 60.5 hours
| 60 hours, 33 minutes
| Demonstration of long-endurance marine tether. Float-only profile. Lost off the coast of San Luis Obispo county.
| Demonstration of long-endurance marine tether. Float-only profile. Lost off the coast of San Luis Obispo county.
|-
|-
| June 1, 2019
| June 1, 2019
| Le Grand
| Le Grand
|
| 3 hours, 52 minutes
| Latex full altitude control. Recovered from near Firebaugh, California on June 1, 2019.
| Latex full altitude control. Recovered from near Mendota, California on June 1, 2019.
|-
|-
|4
|4
| August 5, 2019
| August 5, 2019
| Hollister
| Hollister
| 2 hours
| 2 hours, 0 minutes
| Second flight of in-house constructed polyethylene envelope. Recovered from near Tracy, CA on August 31, 2019.
| Second flight of in-house constructed polyethylene envelope. Recovered from near Tracy, CA on August 31, 2019.
|-
|6
! [[SSI-92]]
| October 5, 2019
| Hollister
| 9 hours, 28 minutes
| First polyethylene tubing envelope. First SSI ZPB flight with full telemetry. First interstate Cycloon flight. Final location near Alamo, NV.
|-
|7
! [[SSI-93]]
| October 27, 2019
| Hollister
| 4 hours, 4 minutes
| First ballast-controlled ZPB. Eventful launch and post-landing. Final location near Tulare, CA.
|-
|8
! [[SSI-97]]
| November 17, 2019
| Pigeon Point
| N/A
| Extensive ZPB ground tests.
|}
|}
[[Category: High Altitude Balloons]]
[[Category: High Altitude Balloons]]