3in Rocket Electronics Bay for SBR Fusion
Description
An aviation bay for the SBR 3" Fusion rocket, longer OROC/LDRS dual deploy edition. Can probably be adapted to others. Note this has not been flight tested yet, so use at your own risk. Parts needed: Eggtracker mini and quark from eggtimerrocketry.com Magnetic switch from Featherweight Altimeters 800mah 2S Eflite battery from Amazon. You can use a 200-300mah battery if you only want a few hours of tracking time. IME this isn't the place to skimp. At least 2 zip ties, more if you want to pretty up your wiring four 2mm x 10mm machine screws and nuts two 2mm (or 3mm) x 6mm machine screws and nuts You may also need some wire and/or ST connectors. Print 2 crossbeams. I used PETG at 0.2mm layers with 15% infill and only 2 perimeters to keep it light. Tolerances assume a 0.4mm nozzle. Place the nuts in the wells on the backside of the avionics part before CA gluing it to the back of the battery tray (line up the zip tie and machine screw holes, the hex holes are just for lightening and aren't meant to align). CA glue on the cross beams, the notches go on the bottom of the battery tray just to keep their depth consistent. Zip tie on battery (or at least thread the top zip tie first), and wire up and mount electronics. The guide goes on the inside of the rocket tube to prevent rotation. It should go on the spar end opposite the switch (that spar is 1mm shorter to allow for it). I recommend on the launch rail side so the magnetic switch is pointing out. I ran wiring to the switch through the battery's ST connector and another ST soldered to the switch, then from the switch to the Quark (soldered) and from the Quark to the Eggtracker via an ST connector pair. So I can remove the eggtracker for use in other rockets (it's the most expensive part). ST connectors are taped just for redundancy in the picture. During use I plan to wrap the e-match wires around the closest crossbeam once or twice for a strain relief before connecting to the Quark.
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