# 2027 IREC Changes

- Better CAD
- \#6 shear pins, at least 4 (maybe 6?) 
    - Do the actual math on drag separation forces and force generated, instead of just using what has worked in the past
    - Tighter shear pin holes with thread engagement.
    - Intentional thread engagement, not in all tubes
    - White shear pins
    - Test seperation force required on the MTS
    - Look at what other teams use as well
- Research vent holes in recovery tubes 
    - What size, how many, do the math on what effect it has and how much we need it.
- Test [Single separation, dual deploy](https://rockets.wiki/books/recovery/chapter/single-seperation-dual-deploy) system with tender descenders 
    - We need to figure out a lines diagram and do lots and lots of subscale testing for this, Cooper is willing to fly L3 at SOD in September/October (Sasha L3 ASAP)
    - Demonstrate repeatable successful deployment and recovery with flight testing.
- Chute bag VS SRAD Nomex 
    - Can also run an SRAD chute bag, but we should fly a cots one a couple times first
    - Reasoning for chute bag is predictability in maximum outer diameter, your main chute can't get stuck as it is physically constrained. It takes a lot of the guess work out of the fold, and as we move to single sep dual deploy <span style="text-decoration: underline;">the force required to pull the chute out of the tube becomes extremely important.</span>
- SRAD ballistic drogue
- SRAD nose cone 
    - Conical VS VK
    - Laid up VS filament wound
- Consider Payload in nose cone 
    - Do math on effects of bending stress, CG, and separation. See if it affects separation loads and charge effectiveness.
- Motor assembled way before we go to IREC, need copies of closures and casing (last years?)
- Test RC2 and RC3+ flight computers with charge authority. 
    - Maybe, keep in mind we didn't have a single failure due to flight computers this year
- Better setup of recovery wiring 
    - Avoid pinch points
    - Going to need a complete revision for single sep dual deploy, need to figure out where we are going to seperate (nosecone vs airbrake)
- Thread retaining bolts and shear pins into bulkheads
- Make team leads read their portion of the DTEG
- TeleGPS holder stays with the group
- Zipper prevention