Whistle for R/C plane
thingiverse
Whistle based on whistling Nerf ball whistles but more compact. Needs 3/8 inch hole for mount in clean airflow (not behind an obstacle). Cylinder needs to be perpendicular to airflow, and only the head needs to protude from the plane. Semicircle faces forward. Plenty loud enough for electric R/C plane. Pitch can be changed by changing the length of the cylindrical portion. On an EDF I find inside the intake works better than in the exhaust duct but personally I prefer on the underside of the model for a mode subtle effect.
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