2021 IREC Avionics Bay

Owned by Joseph Even (RIT Student)
Last updated: Sept 29, 2020
2 min read

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