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nordlandstrompet · 05-02-2008, 06:21 PM

Fast air?

In a car carburator the is a device called "venturi" where the gas dies is mounted. The "venturi's" mission is to give the intake air a higher speed, to be able to let the dies work correct. The venturi is a device which looks like a time glass.

So, what is meant with fast air?

The answer of this might be "venturi".
When your tongue is placed normally in your mouth, there is no venturi. When you lift your tongue up, you are making a venturi which forces the airstream to a higher speed when it passes your tongue. Your lips are also making a venturi, and the more you squeese them together, the smaller the venturi appears, and the smaller the venturi is, the faster the airstream will travel. In your mouthpiece you have a cup which "brakes" the airstream because of its volume, but the airstream will accelerate when it goes through the mouthpiece, and will slow down again when it goes into the leadpipe. The speed of the airstream which comes out of the bell, will be at slow speed, because of the diameter of the belltube. The crossection of your embouchure is e.g. 1mm in dia, and the bell is e.g. 40-50mm. To give an example: Fill your loungs with air, hold your hand in front of your mouth and blow the air out of your fully open mouth, Feel how strong the airflow is. Repeat with your mouth closed and blow the air through one side of your nose. If you use the same pressure when on both methods, the time you use to empty your lounges should be the same, but the nose method should give more pressure, and faster airstream. With faster air, the vibrationspeed of your lips should be higher. OR?

05-02-2008, 06:21 PM	#15 (permalink)
nordlandstrompet Piano User Join Date: Apr 2008 Location: Norway Posts: 348	Re: the myth of "fast air" Fast air? In a car carburator the is a device called "venturi" where the gas dies is mounted. The "venturi's" mission is to give the intake air a higher speed, to be able to let the dies work correct. The venturi is a device which looks like a time glass. So, what is meant with fast air? The answer of this might be "venturi". When your tongue is placed normally in your mouth, there is no venturi. When you lift your tongue up, you are making a venturi which forces the airstream to a higher speed when it passes your tongue. Your lips are also making a venturi, and the more you squeese them together, the smaller the venturi appears, and the smaller the venturi is, the faster the airstream will travel. In your mouthpiece you have a cup which "brakes" the airstream because of its volume, but the airstream will accelerate when it goes through the mouthpiece, and will slow down again when it goes into the leadpipe. The speed of the airstream which comes out of the bell, will be at slow speed, because of the diameter of the belltube. The crossection of your embouchure is e.g. 1mm in dia, and the bell is e.g. 40-50mm. To give an example: Fill your loungs with air, hold your hand in front of your mouth and blow the air out of your fully open mouth, Feel how strong the airflow is. Repeat with your mouth closed and blow the air through one side of your nose. If you use the same pressure when on both methods, the time you use to empty your lounges should be the same, but the nose method should give more pressure, and faster airstream. With faster air, the vibrationspeed of your lips should be higher. OR? __________________ nordlands "All music is folkmusic. I ain't never heard no horse sing no song?" Louis Armstrong Wife still says: Trumpets are expencive!