# velocityModelSpace

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### Description

Description:
Returns the velocity (speed vector) of the vehicle as an array with format [x, y, z] in metre per second. Vector is in model space.
Groups:
Object Manipulation

### Syntax

Syntax:
velocityModelSpace vehicle
Parameters:
vehicle: Object
Return Value:
Array

### Examples

Example 1:
velocityModelSpace _chopper; // returns [X (left(-) right(+)), Y (backward(-) forward(+)), Z (down(-) up(+))]

### Additional Information

See also:
setVelocityModelSpace velocity speed setVelocity setVelocityTransformation

### Notes

Report bugs on the Feedback Tracker and/or discuss them on the Arma Discord or on the Forums.
Only post proven facts here! Add Note
Pierre MGI - c
Posted on Dec 11, 2014 - 02:55 (UTC)
This function is useful for helicopters as it returns Z vector like an indicator of thrust/load ratio. More or less climb (+) or descent (-) tendency but: As X,Y,Z vectors are relative to vehicle attitude, this function doesn't return a climb or descend rate (as the attitude of the vehicle can be far from horizontal). You can get negative Z vector, in jets, while climbing fast, peeling off in the sky! More or less, you can use as a Z accelerometer factor but invert the sign: +G acceleration (negative vector below the jet) is -Z here. If not "physically" correct, the behavior is sufficient enough for Arma flight model.
K.J. - c
Posted on Jun 21, 2015 - 02:36 (UTC)
Previous note is physically incorrect. Velocity can not be used to give information about Thrust/Load ratio or G-Forces/acceleration. To get acceleration you have to create the derivative of velocity after time dv/dt -> the difference of velocity between 2 timesteps divided by the time that passed between the 2 steps.