Trumpets of Jericho - wind powered air siren

Trumpets of Jericho

The Trumpets of Jericho is a 3D-printable wind-powered sound turbine designed to make a loud, fun turbine/whistle-like sound when air flows through it. It consists of four main printed parts: the intake cone, rotor, stator, and ball bearing tail.

This version uses a 4-blade rotor, which gives it a deeper and lower tone compared to higher blade-count versions like 8-blade or 11-blade rotors. With fewer air pulses per rotation, the sound becomes less sharp and more low-pitched, making this version great if you want a stronger, deeper turbine sound.

This model is fun to print because it is not just a static object — it actually does something. Once assembled, the airflow spins the rotor and creates a unique mechanical siren sound. It is a great project for experimenting with airflow, sound, bearings, rotor designs, and different blade/port counts.

You can test it by holding it in front of a leaf blower, placing it in strong airflow, or safely holding it out of a car window to hear it come alive. The faster the airflow, the more intense the sound becomes.

The design is especially interesting for makers who like functional prints, RC projects, wind-powered gadgets, or mechanical toys.

Recommended use:

• RC airplanes
• leaf blower testing
• car window airflow testing
• airflow experiments
• functional mechanical print demonstrations
• sound and turbine experiments

For printing, I recommend using PETG or PLA Tough for better durability. Regular PLA may work for testing, but a tougher material is better for repeated use and higher airflow.

Assembly is simple: print the parts, install the bearing, place the rotor and stator together, and secure the assembly with the bolt.

Hardware needed:

• 1× 608 bearing
• 1× M8-1.25 × 25 mm bolt