2021 IREC Avionics Bay

NOTE: white-board drawing at bottom of page

THINGS TO DISCUSS:

• Put Big Red Bee on battery side of av bay
  • do we have any reason not to keep it on all the time other than battery draw? If that's our tracker, probably beneficial to always have it on
  • If it's always on, we can keep it on battery side of sled and have a direct connection with no RBF switch in between it and power

https://www.mouser.com/ProductDetail/Neutrik/NADB9FF-B?qs=%2Fha2pyFadui90%2FcOPJkoXD8AeRm0GKTdDC7DLUrcFzUMsanQU0M8lQ%3D%3D

https://www.digikey.com/product-detail/en/assmann-wsw-components/AK129-2/AE9869-ND/821624

Construction:

• Bulkhead located on top of av bay
• Entire av bay can be pulled out in one piece
• Need wiring passthroughs for deployments

Order From Nosecone to Tail:

1. Camera
2. Switches (RBF)
3. Sled

• • SPICA board
    • 900 MHz antenna, GPS Patch antenna
  • RRC3 COTS Altimeter
  • Big Red Bee BeeLine GPS
  • Eggtimer
  • Camera battery
    
    

Top-Down Assembly:

Top Bulkhead (Structural)

• Permanently fixed 
• Secured with rocket epoxy
• Threaded rods go only halfway through bulkhead and are able to be pulled out
• Panel mount connected w/ top of cameras for wires to pass through to charges
• Screws for alignment / compression of charge passthroughs

Camera Bulkhead (Non-Structural)

• Holds panel mount connector that will go into top bulkhead passthrough
• Threaded rods screwed into camera bulkhead but extend beyond into the top bulkhead

Cameras

• Wires coiled in center (not needed if we're going with the panel mount passthroughs discussed above)
  
  

RBF Bulkhead (Non-Structural)

• Holds RBF switches
• Wires through

RBF

• Mount onto RBF Bulkhead
• Threaded rods screwed into RBF bulkhead

Upper Sled Bulkhead (Non-Structural)

• Holds sleds in place (small indentations for sled channels)
• Wires through

Sled

• We should not need to access nuts or screws in the regions between the two sleds
  • Huge pain in the ass
  • Riv-nuts ( ? )
  • Threaded inserts + Standoffs
  • Alternate Solutions
• Batteries all on one side
  • Power leaves Sled Side A (contains battereis), goes up into switches, and goes down into Sled Side B where Avionics are located
• MAYBE have a PCB taht takes in all the random avionics cables and turns them into a single type of standardized connector, that way we have less harnessing and mess

Lower Sled Bulkhead (Non-Structural)

• Holds sleds in place (small indentations for sled channels)
• Clamped to Bottom Bulkhead with Nuts on threaded rods

Bottom Bulkhead (Structural)

• removeable w/ square O-ring slot except the O-ring is a quattro 
• 0.75" thick bulkhead
• LUBE
• LOTS AND LOTS OF LUBE
• AND EVEN MORE LUBE
• screw holes on top of quattro ring
• one piece with eyebolt (4th axis baybeee!)
  • Look for a normal one, if Jim wants to be bold he can do that on his own time
• Threaded rods run through, gets secured with nuts
• Screws will enter the bulkhead from outside the rocket

Bulkhead Cable Passthrough:

• Should be friction fit, clamped together with screws on bulkheads
• Possible names:
  • Passthrough
  • Blind Mate
  • Panel Mount
  • Gender Changer
  • Feedthrough