63 photos
ZephyrMe with Zephyr
ZephyrZephyr standing next to a door for scale
ZephyrBefore heading out to the range
ZephyrZephyr on the pad
ZephyrReady for launch
ZephyrOn the range line with other rockets
ZephyrRange line, looking down the row of pads
NeedlepointAirframe, nose cone, shock cord, and parachute laid out
NeedlepointMy range box: tape, tools, wire, and a spare chute
Custom ESP32 Flight ComputerLatest revision, fully populated
Custom ESP32 Flight ComputerClose-up of the power stage: LM2596 regulator and inductor
Custom ESP32 Flight ComputerAn earlier revision with rework wires and a flagged capacitor
Custom ESP32 Flight ComputerBench testing with a USB-serial adapter and scope probes
Custom ESP32 Flight ComputerProbing the ESP32 module during bring-up
Space Enterprise BerkeleyThe team's vertical test stand
Space Enterprise BerkeleyWiring hardware on the bench
Space Enterprise BerkeleyInside an aluminum electronics enclosure
Space Enterprise BerkeleyNight setup at the test site: gas cylinders and feed lines
PCB Photolithography at HomeDeveloped photoresist on copper, first attempt
PCB Photolithography at HomeA cleaner exposure with sharper traces
PCB Photolithography at HomeV1 etched and stripped
PCB Photolithography at HomeV2, with tighter, cleaner traces
PCB Photolithography at HomeA homemade board populated with a timer IC and passives
How 3D-Printed Infill Patterns Affect VibrationCantilever specimen clamped to the spindle with the accelerometer at its tip
How 3D-Printed Infill Patterns Affect VibrationSpindle power supply and controller inside the enclosure I built
How 3D-Printed Infill Patterns Affect VibrationBench layout of the power supply and control boards
How 3D-Printed Infill Patterns Affect VibrationEnclosure wired up and running
How 3D-Printed Infill Patterns Affect VibrationFree-decay test, rectilinear beam: detected peaks (red) and exponential decay fit (green) on each axis
How 3D-Printed Infill Patterns Affect VibrationY-axis damping ratio by infill pattern
How 3D-Printed Infill Patterns Affect VibrationRMS acceleration vs. damping ratio by infill pattern
Custom CNC MachineThe machine in CAD: sheet-metal frame, linear rails, printed brackets, spindle, and the electronics enclosure
Custom CNC MachineOne axis on the bench: parallel steel rails, lead screw, carriage plate, printed end blocks, and the travel-limit microswitch
Custom CNC MachineThe control tray: three stepper drivers, the switching supply, and the Arduino under its CNC shield
Custom CNC MachineThe handheld pendant I printed and wired: abort and resume
Rocket Project v1The team
Rocket Project v1The first printed rocket
Rocket Project v1Concept: where the PCB lives inside the body tube
Rocket Project v1Tray v1: bulky
Rocket Project v1Tray v2: fits two boards, too heavy
Rocket Project v1Tray v3: batteries too high
Rocket Project v1Tray v4: solved the problems
Rocket Project v1Tray v5: carbon rods to save weight
Rocket Project v1v5 built and ready for the rocket
Rocket Project v1Data logger PCB layout
Rocket Project v1Assembled logger: Nano, MPL3115A2, SD card
Rocket Project v1556 dual-timer deployment schematic
Rocket Project v1556 deployment board layout
Rocket Project v1Relay deployment schematic, v2
Rocket Project v1Relay deployment board layout
Rocket Project v1The full printed rocket
Rocket Project v1The original resin-printed nose
Rocket Project v1Redesigned nose with parachute attachment
Rocket Project v1Old vs. new nose side by side
Rocket Project v1Middle body tube in CAD
Rocket Project v1Body tube cut down to fit the avionics
Rocket Project v1Fin can in CAD
Rocket Project v1Three cast fin materials
Rocket Project v1Printed ejection charge capsule
Rocket Project v1Capsule, top view
Rocket Project v1Ground test of the electronics and deployment
Rocket Project v1Electronics sled wiring
Rocket Project v1OpenRocket simulation: altitude, velocity, acceleration
Rocket Project v1The rocket modeled in OpenRocket