---
layout: wiki
title: Advanced Ballistics
description: The advanced ballistics module improves internal and external ballistics. 
group: feature
parent: wiki
---

## 1. Overview
The Advanced Ballistics module improves internal and external ballistics. 

## 1.1 Features
- Drag modelling based on real-world ballistic coefficients.
- Ambient air density (air pressure, temperature, humidity) affects drag.
- Wind affects drag and deflects the trajectory.
- Wind speed varies with altitude.
- Terrain features, buildings and other objects disrupt the wind.
- [Magnus effect](https://en.wikipedia.org/wiki/Magnus_effect) (spin drift)
- [Coriolis effect](https://en.wikipedia.org/wiki/Coriolis_effect) and [Eötvös effect](https://en.wikipedia.org/wiki/Eotvos_effect) (Earth rotation)
- Loss of stability during transonic flight.
- Variable muzzle velocity based on powder burn rate and barrel length.
- Bullet trace effect for supersonic bullets (light refraction due to air pressure waves).
- A protractor for quickly measuring the inclination angle.

## 2. Usage

### 2.1 Protractor
Press <kbd>Ctrl</kbd>+<kbd>Shift</kbd>+<kbd>K</kbd> while using a compatible weapon to toggle the protractor. The red line indicates the current inclination angle in degrees. The protractor will disappear if you lower or holster your weapon.

## 3. Dependencies
`ace_ballistics`, `ace_weather`, `ace_modules`