Responsible Engineers: Emily Albornoz, Hermanus Jacobs, Jacky Zheng, Cruz Soto

Fall 2023

CAD of sustainer AV bay

Previous Work: 

Phoenix: Sustainer - Avionics Bay Structures, Booster - Avionics Bay Structures

Hermes III: November 24, 2019 Shake Test, Hermes III Avionics Tower Force Testing, Hermes 3 Reaction Wheel Proposal, Hermes III Payload Bulkhead

Spring 2023

03/22/2023 - Updates from Concept Design Review

• We need to replace the uneven rods with spacers to maintain uniform distancing
• Replace all polycarbonate with G10 fiberglass
• Now that the piston has been chosen, the top bulkhead will be made out of metal
• All avionics decisions, sizing, and placement will no longer be made by the listed R.E.'s

03/05/2023 - Basic Design and Concept Design

• Finalized the switchband system and list of materials
• Presentation for Concept Design Review here

02/19/2023 - Preliminary Research

• To do:

• Screw terminal loose – was this the cause of avionics turning on? → Talk to avionics

• Look into reviews of screw switches

• https://www.rocketryforum.com/threads/the-avionics-bay-thread-post-your-photos.156649/

• Talk to Avionics about required components for upper and lower avionics towers

• Calculate space above AV tower needed to store parachute

• Look at and dimension Phoenix booster mission package tube

• 4 components: parachute area for 1st stage, AV bay, parachute area for 2nd, motor

• Start CADing slider AV tower

• Research extra forces on AV tower from parachutes, potential buckling

• Decide...

  • how many avionics towers, what does the deployment look like 

  • approximate dimensioning, looking into what the mass would be for these systems assuming Phoenix Avionics systems weights and lengths

  • Need an estimate of board size

• Issue of the bay turning on in transit:

  • Did the vibration of the system cause the screw to move? If so, we may need better screw switches. This one was highly reviewed by rocketry forum: https://www.csrocketry.com/electronics/missleworks.html

  • *I need someone to come up with the test and give me commercial vibrational testers

• Incorporating a window for easy access

• packing volume of the lines and prevent potential line entanglement issues.

• Approximate diagram of the system with avionics system (not a schematic)
• Switchband system: 
• 
• *CO2 canister would be in place of a charge well. CO

Other Research

• Pomona Liquid Rocket Lab (pg 117+)
  • Reinforced, system has a lot of rasberry pis since its for LP, ours will likely be smaller
  • Similar to above switchband
• Nosecone bay kits, do we want or need one for GPS, for the pitot tube?