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# Incidence & Airspeed

Calculate incidence and airspeed

## Library

Flight Parameters

## Description

The Incidence & Airspeed block supports the 3DoF equations of motion model by calculating the angle between the velocity vector and the body, and also the total airspeed from the velocity components in the body-fixed coordinate frame.

`$\begin{array}{l}\alpha =\text{atan}\left(\frac{w}{u}\right)\\ V=\sqrt{{u}^{2}+{w}^{2}}\end{array}$`

## Inputs and Outputs

InputDimension TypeDescription

First

Two-element vector Contains the velocity of the body resolved into the body-fixed coordinate frame.
OutputDimension TypeDescription

First

Contains the incidence angle, in radians.

Second

Contains the airspeed of the body.

## Examples

See the Aerodynamics & Equations of Motion subsystem of the `aeroblk_guidance_airframe` model for examples of this block.