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# Mach Number

Compute Mach number using velocity and speed of sound

## Library

Flight Parameters

## Description

The Mach Number block computes Mach number.

Mach number is defined as

$Mach=\frac{\sqrt{V\cdot V}}{a}$

where α is speed of sound and V is velocity vector.

## Inputs and Outputs

InputDimension TypeDescription

First

m-by-3

Contains the velocity vector.

Second

1-by-1

Contains the speed of sound.

OutputDimension TypeDescription

First

m-by-1

Contains the Mach number.

## Examples

See Airframe in the aeroblk_HL20aeroblk_HL20 model for an example of this block.

Aerodynamic Forces and Moments

Dynamic Pressure