Inside the tube of the RC-Cornet®/RC-Cornet®N a rubber hose is connected to the mouthpiece as shown in the above pictures. At rest the hose lies on the curved tube that it is housed in (a).

On blowing into the mouth piece the hose is inflated with air, it extends forwards in the direction of the mouth piece until it hits the wall of the curved tube, where it is “kinked” (b).

The “kink” prevents the air from passing straight through the hose. As exhalation continues the pressure builds up and the “kink” is pushed along the wall of the tube (c).

Once the “kink” has moved relatively far along the tube the hose starts touching the inner side of the tube at a position close to the mouth piece (d).

This triggers the formation of a new “kink” close to the mouthpiece which will be pushed through the tube in the same manner, so that the process restarts (e).

The illustrations a-e show how the air is pushed through the “valve” hose in pockets of air. In order to keep the processes going a constant positive pressure has to be applied to the system. This pressure undergoes fluctuations as the pockets of air move through the tube. It is possible to adjust the pressure and flow characteristics by twisting the hose in the tube. This adjusts the air pocket size that is formed and the pressure with which it has to be pushed through the tube.

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