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[[File: IREC2018pose.jpg|400px|thumb|right|frame|The team posing with the fully integrated rocket before launching it at the competition.]]
[[File: IREC2018pose.jpg|400px|thumb|right|frame|The team posing with the fully integrated rocket before launching it at the competition.]]
IREC 2018 was the second SSI IREC team to participate in the [[Intercollegiate Rocketry Engineering Competition]], placing second in the 30k commercial off-the-shelf motor category. The rocket was named Redshift and featured an avionics bay with a long-distance radio system, a reduced-diameter recovery system, a fiberglass airframe with a carbon fiber fin lay-up, a powered decoupling mechanism, and a software-defined GPS payload.
IREC 2018 was the second SSI IREC team to participate in the [[Intercollegiate Rocketry Engineering Competition]], placing second in the 30k commercial off-the-shelf motor category. The rocket was named Redshift and featured an avionics bay with a long-distance radio system, a reduced-diameter recovery system, a fiberglass airframe with a carbon fiber fin lay-up, a powered decoupling mechanism, and a software-defined GPS payload. The successor to the project was [[Olympus 2019]].
=Overview=
=Overview=
[[File:IREC2018cad.png|800px|thumb|center|frame|CAD model of the rocket, displaying subsystem layout.]]
[[File:IREC2018cad.png|800px|thumb|center|frame|CAD model of the rocket, displaying subsystem layout.]]
The system went through a few key iterations: at first, a full staging system was considered, then a boosted dart system. After those options turned out to be relatively infeasible due to manpower and expertise issues, as well as the full system redesign that it would have required to conform to smaller airframe diameters, a move was made to a powered decoupling system.
==Avionics==
==Avionics==
The main boards in the avionics system were:
The main boards in the avionics system were:
* [[Skybass]], an altimeter developed by [[User:Johnldean|John Dean]]
* [[Skybass]], an altimeter developed by [[User:Johnldean|John Dean]]. Testing of Skybass was referred to as SHITL (pronounced "shittle," /ʃɪt(ə)l/)
* Motherboard, which was the main interface between all other boards and contained the power distribution, arming systems, and e-match firing pathways.
* Motherboard, which was the main interface between all other boards and contained the power distribution, arming systems, and e-match firing pathways.
* Daughtership, a board for mounting the StratoLogger and Raven COTS altimeters.
* Daughtership, a board for mounting the StratoLogger and Raven COTS altimeters.
==Recovery==
==Recovery==
At apogee, the recovery system deployed a small drogue parachute for a swift, controlled descent that minimized horizontal drift. The deployment of the drogue was triggered by a CO2 canister deployment mechanism.
At apogee, the recovery system deployed a small (32") SRAD drogue parachute for a swift, controlled descent (~70 ft/s) that minimized horizontal drift. The deployment of the drogue was triggered by a CO2 canister deployment mechanism.
When the rocket reached an apogee of 1,500 feet, the main chute, which was retained in the recovered tubing by the Tender Retention System, was deployed for a soft landing.
When the rocket reached an apogee of 1,500 feet, the main SRAD chute (90"), which was retained in the recovery bay by the Tender Retention System, was aimed to deploy for a soft landing. Due to compact packing, the main chute did not successfully deploy.
The recover tube was selected to have a reduced diameter, smaller than that of the rocket airframe. This reduced diameter was chosen so that the parachutes would be able to deploy through the restriction in the airframe size caused by the staging ring.
The recovery bay was selected to have a restricted diameter (2.65"), smaller than that of the rocket airframe (3.9"). This reduced diameter was chosen so that the parachutes would be able to deploy through the restriction in the airframe size caused by the staging ring.
==Structures==
==Structures==
==Launch 1==
==Launch 1==
TODO: Attach launch stats and a link to the data?
==Launch 2==
==Launch 2==
* [https://drive.google.com/file/d/11V0K0Fe9YUkwESrhL8_F12ssUUUeGvvl/view?usp=sharing SRADio Podium Presentation Slides]
* [https://drive.google.com/file/d/11V0K0Fe9YUkwESrhL8_F12ssUUUeGvvl/view?usp=sharing SRADio Podium Presentation Slides]
* [https://drive.google.com/file/d/1nuDhLZtP00u9kX1kKX7aCkomgPamfNCM/view?usp=sharing SRADio Podium Presentation Proposal]
* [https://drive.google.com/file/d/1nuDhLZtP00u9kX1kKX7aCkomgPamfNCM/view?usp=sharing SRADio Podium Presentation Proposal]
[[Category:Rockets]]