# Aerial Payload Deployment Systems
DeltaQuad's Aerial Payload Deployment Systems (APDS) comes in two versions.
## Single APDS
* Single APDS for one larger cargo drop or two smaller cargo drops.
* The **dividers** can be used to either center a larger cargo or divide the payload area into two separate sections, allowing for the dropping of two cargos at different locations.
* The total maximum cargo weight for the single APDS is **2.5 kg**
***
## APDS with Auxilliary Battery
* APDS with an auxiliary battery provides extended flight time, increased range, and the possibility of one cargo drop.
* The **dividers** can be used to center the cargo within the bay.
* The maximum cargo weight for the APDS with auxiliary battery is **1 kg.**
* For more information about placing the auxiliary battery, please read the details [here](/tac/setup/deltaquad-evo-battery/auxiliary-battery-placement.md).
***
## Installation
Both payload boxes are designed in a dual payload configuration, occupying the space of **Payload Slot 1** and **Payload Slot 2**.
DeltaQuad Evo Payload Slot Layout
* **Slot 1:** Located at the rear end of the fuselage, closest to the pusher propeller.
* **Slot 2:** Located at the front end of the fuselage, closest to the nose of the vehicle.
* Each payload shows two **arrows** on top of two handles.
* There are corresponding **arrows** on both the left and right sides of the DeltaQuad Evo's payload bay.
* The arrows on the payload boxes must be aligned with the arrows in the payload bay.
* Install the APDS and place the cargo **centered** inside the APDS before going through the [**Pre-Flight Check**](/tac/flight/pre-flight-checks.md)[**s**](/tac/flight/pre-flight-checks.md). Use the provided dividers to center the cargo if necessary.
* If the **APDS with the auxiliary battery** is in use, please review the section on how to install it [here](/tac/setup/deltaquad-evo-battery/auxiliary-battery-placement.md).
***
## Mission Planning
* We recommend an altitude of **40 meters** when triggering the APDS doors for the best precision.
* For optimal flight stability and best results, it is recommended to plan the mission so that the vehicle flies **into the wind** when the APDS is triggered.
* To use the APDS, a mission plan must be created. Plan a VTOL Takeoff and Transition, along with Intermediate Waypoints, up to the location where you wish to open de APDS doors. Please review the instructions for planning a [**VTOL Takeoff, Transition**](/tac/flight/planning-a-mission/mission-start-action.md), and [**Intermediate Waypoints**.](/tac/flight/planning-a-mission/set-intermediate-waypoints.md)
* To program the command for triggering the APDS doors, an additional waypoint must be planned and set as a **Custom Action Command**.
***
1. Create a waypoint at the location and altitude where the APDS doors should be triggered**.** In the example below, the doors should open at **waypoint 4**.
2. Create another **waypoint** anywhere on the **map**.
3. In the **Mission Editor**, on the right side of the screen, click on the **Waypoint type (Waypoint)**.
4. A menu will open, allowing you to **Select** a **Waypoint Type,** choose **Action.**
5. As soon as the **Waypoint Type** is set to **Action**, waypoint 5 will be attached to waypoint 4 as a **Custom Action.**
6. In the **Mission Editor**, the **Action** tab is available on the right side of the screen. When you click on it, a drop-down menu will appear. Select **Payload drop open both doors**.
7. We have now planned a payload drop at waypoint 4 at an altitude of 40 meters. Finish the mission with the subsequent waypoints and a landing pattern.
* Waypoint 4 has an altitude of 40 meters. For improved precision, waypoints 3 and 5 can also be planned at the same altitude. This allows the vehicle to maintain a consistent altitude before and after the drop, aiding in the precision of the drop.
* For a less visible approach and a fast retreat, waypoints 3 and 5 can be set at a higher altitude.
***
## Custom Actions - Single APDS
{% hint style="info" %}
For the **Single APDS**, three custom actions are available:
* Payload drop - open both doors
* Payload drop - open the right door
* Payload drop - open the left door.
{% endhint %}
## Custom Actions - APDS with Auxiliary Battery
{% hint style="info" %}
For the **APDS with Auxiliary Batter**y, two custom actions are available:
* Payload drop - open the right door
* Payload drop - open both doors (only the right door will open!)
{% endhint %}
***
{% hint style="info" %}
A **payload drop** can be planned in conjunction with a **Stealth Switch**, which is recommended if no radio emissions should be present during the drop. First, plan a waypoint with a custom action that engages the Stealth Switch. The next step is to plan the payload drop. Lastly, plan a waypoint to turn the radio back on. Please review the chapter on the Stealth Switch [here](/tac/flight/planning-a-mission/set-intermediate-waypoints/stealth-switch.md).
{% endhint %}
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