The airspeed indicator is used to determine and maintain the flight speed. The sensing element is a manometric box, into which the total pressure of the oncoming air flow Ptot is supplied from the HPH. = Rst. + ρV2 / 2.

1. The body of the device receives static pressure, which is equalized with the static, which is in the gauge box.

2. The arrow of the device responds only to the velocity head – ρV2 / 2.

3. The deformation of the gauge box is transmitted to the arrow through the transmission mechanism.

4. The price of one division of the scale is 10 km / h, digitization after 50 km / h.

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