Trumpets of Jericho – 11 Blade Version air siren

Trumpets of Jericho – 11 Blade Version

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 is the 11-blade version, which creates more air pulses per rotation than lower blade-count versions like 4-blade or 8-blade rotors. That means this version should produce a higher, sharper, more siren-like tone when enough airflow passes through it.

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 recommended 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