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Module 10 — Build, integration & iteration

A drone is a system, not a pile of good parts. Integration quality — solder joints, wire routing, vibration paths — is what separates a craft that flies for a season from one that fails at 300 m out.

🟢 Foundations. The build order that works: dry-fit everything on the frame → plan wire lengths and UART assignments on paper → solder off the frame where possible → mount with vibration in mind → first power-up through a smoke stopper (a current-limited fuse plug) with props off → configure → bench-check failsafe → maiden in an open field. Learn to solder properly: clean iron at ~350–400 °C, flux always, tin both sides, a joint should be shiny and concave. A cold joint at the XT60 is a fire; a cold joint on a motor pad is a flip-of-death.

🟡 Practitioner. Weight and balance are calculable, not vibes: center of gravity along an axis is

xCG=∑imixi∑imix_{CG} = \frac{\sum_i m_i x_i}{\sum_i m_i}

Keep the battery over the CG so the tune survives pack changes. Route noisy conductors (motor wires, VTX) away from GPS/compass; twist supply pairs; one clean ground path between camera–FC–VTX prevents ground-loop video noise. Use threadlocker on metal-into-metal screws near motors, never on nylon.

🔴 Advanced. Vibration engineering: the FC's gyro should see the airframe through soft mounts (gummies) — but too soft adds phase lag; the arms' resonant frequency shows up as that fixed spectrogram bar from Module 9. Crash forensics as a discipline: bent prop → check motor bearing play → check blackbox for pre-impact desync → inspect solder under magnification. Keep a build log (weights, versions, settings diffs) — future-you debugging at the field will send thanks.

⚫ Master. You design your own frames or mounts in CAD, print/cut them, and validate stiffness against the spectrogram; you maintain a fleet with documented, reproducible configurations (diff-able CLI dumps under Git); your crash-to-airborne turnaround at the field is minutes, because the toolbox and the process are engineered too.

Mastery checklist

  • Complete a full build where the maiden's blackbox shows no fixable noise sources.
  • Trace and fix a ground-loop video interference without shotgun part-swapping.
  • Reproduce your exact craft from your own documentation, no memory allowed.

🖼️ Image ideas: your own step-by-step build photos (best possible content — and fully yours); macro shots of good vs bad solder joints.

📚 Free resources: Oscar Liang build guides; Betaflight docs "First flight checklist"; manufacturer frame manuals.