Whistle Sound on RC Glider,Normal or Something Else?

[Gula]

My RC glider produces a subtle whistle sound during flight. Is this a normal aerodynamic effect, or should I be worried? It doesn't seem to impact performance, but I want to be sure.

[ferp420]

That's likely the sound of the wind passing through the wings. It's pretty normal for gliders, especially during certain maneuvers. As long as the glider handles well, the whistle is usually nothing to worry about.

[Thorsteenster]

It's more noticeable in certain wind conditions. If your glider flies smoothly and responds well to controls, the whistle is just part of the aerodynamics.