Hi there!!
I'm Roman. I've been sicked for a long time and still recovering. A beginner to the flute, and having a lower resistance, I'm not satisfied with my overall tone quality when I blow it( especially on middle to high registers). Its thinner than normal, like a whistle, maybe like a piccolo.
Aside from weak resistance, I suspect the lenght, thickness and diameter of my C flute as factors. It has thinner wall and shorter and smaller diameter.
Am I right?? What are your comments? Are there websites that discuss these factors?? thanks to all of you..