IdeaWell

Project ideas from Hacker News discussions.

I built a drone with only one motor [video]

Original Article

Hacker News Discussion

📝 Discussion Summary (Click to expand)

Theme 1 – Mechanical elegance / simplicity
The design replaces a traditional swash‑plate with a clever hinge‑and‑magnetic‑encoder system, making the rotor mechanically simple while moving complexity to software.

“I really like how mechanically simple the rotor hinge design is - it pushes all the complexity into the control algorithm.” – leoedin

Theme 2 – Control‑algorithm demands and stability challenges
Because the vehicle is under‑actuated or dynamically unstable, sophisticated real‑time control (often computer‑driven) is required to make it flyable.

“they are not humanly pilotable without computers. they are inherently unstable.” – KolmogorovComp
“Underactuated robotics are so cool… controlling the single motor's speed…” – TGower

Theme 3 – Potential applications and broader implications
Commenters speculate about uses such as spinning‑payload imaging, military/scanning roles, and effects on drone warfare, while weighing added weight and complexity against possible benefits.

“Perhaps there are specific applications where the payload spinning could be an advantage, imaging/scanning perhaps…” – Aboutplants
“How will this new tech affect the current drone war between Russia and Ukraine?” – tintor
“maybe new breakthroughs for the DARPA project. kamikaze drones do not need so advanced prop… ” – eimrine

🚀 Project Ideas

Generating project ideas…

UniFlight Control Suite

Summary

  • Open-source firmware library that provides ready‑to‑use control algorithms (LQR, MPC, adaptive torque modulation) for single‑motor, underactuated drones.
  • Abstracts sensor fusion (IMU + magnetic encoder) and handles stabilization, letting hobbyists focus on airframe design instead of control theory.

Details

Key Value
Target Audience Hobbyist drone builders, researchers, university labs
Core Feature Configurable control stack with IMU/encoder fusion, torque modulation, and fail‑safe modes
Tech Stack C/C++ (STM32 HAL), optional Python host tool for tuning, MAVLink telemetry
Difficulty Medium
Monetization Hobby

Notes

  • Leoedin praised the design: “It uses a special hinge design, a magnetic encoder and torque modulation to control the lift of the rotor as it spins. Completely negates the need for a conventional helicopter's swash plate.”
  • Would enable the community to replicate the single‑motor drone shown in the Hackaday video and expand to larger platforms as mainecoder suggested.

SingleProp Drone Kit

Summary

  • Modular hardware kit that includes the hinge mechanism, magnetic encoder, brushless motor, and a flight‑controller board, all with open‑source CAD and firmware.
  • Lets users quickly build and test single‑propeller drones without sourcing custom parts or designing PCBs from scratch.

Details

Key Value
Target Audience Makers, educators, RC‑enthusiasts, research groups
Core Feature All‑in‑one kit: frame with hinge, encoder‑mounted motor, STM32‑based flight controller, power distribution
Tech Stack Mechanical CAD (Fusion 360/OpenSCAD), PCB design (KiCad), firmware (C/C++), optional Ground‑Station software (QGroundControl)
Difficulty Medium
Monetization Revenue-ready: Sale of kits $149

Notes

  • Aboutplants noted the payload‑spinning advantage for imaging/scanning, and mainecoder saw potential for larger drones if error margins are reduced.
  • The kit directly addresses the frustration expressed by users who want to experiment with the hinge‑and‑encoder approach but lack a ready‑made platform.

FlutterScan

Summary

  • Desktop tool that processes high‑speed video footage to extract rotor vibration modes, detect flutter frequencies, and suggest design fixes (blade balancing, hinge tuning).
  • Provides an easy‑to‑use workflow for diagnosing the vibration issues mentioned by several commenters.

Details

Key Value
Target Audience Drone engineers, hobbyists building high‑speed cameras, vibration analysts
Core Feature Video import → ROI tracking → FFT analysis → flutter frequency report with actionable recommendations
Tech Stack Python, OpenCV, NumPy/SciPy, optional Jupyter notebook interface
Difficulty Low
Monetization Hobby

Notes

  • Mikeyouse said: “Love the little side project of building a high resolution high speed camera to investigate the flutter.”
  • JacobAsmuth confirmed that fixing vibration was as simple as swapping rotors; FlutterScan would let users identify the problematic mode before trial‑and‑error, saving build time.

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