AeroTech G72DM-14A DMS Motor Setup Guide

By Quest Q-jet | Published: 2026-10-29

Category: How-to Guides

Learn how to assemble and prep the AeroTech G72DM-14A single-use DMS motor. This guide covers delay drilling, ejection charge setup, and common mistakes to avoid.

Quick answer

The AeroTech G72DM-14A is a single-use DMS motor that requires user assembly: set the delay with the Universal Delay Drilling Tool, then add the ejection charge. Follow the steps below to prep it correctly for launch.

Why Choose the DMS System?

The Disposable Motor System (DMS) combines the convenience of a single-use motor with the flexibility of choosing your delay time. Unlike fully pre-assembled single-use motors, the G72DM-14A lets you drill the delay to match your rocket's weight and altitude needs, but it also means you must have the Universal Delay Drilling Tool (UDDT) on hand. The motor comes with the nozzle and propellant pre-installed, so you only handle the delay and ejection charge.

Step-by-Step Assembly for the G72DM-14A

1. Gather Your Tools: You will need the G72DM-14A motor kit, the Universal Delay Drilling Tool (UDDT), a ruler or depth gauge, and the ejection charge powder (usually included). Ensure you have a clean, flat work surface. Common mistake: starting without the UDDT. The motor cannot be assembled without it.
2. Determine the Desired Delay: Check your rocket's simulation or manufacturer recommendation for the optimal delay time. The G72DM-14A comes with a pre-drilled delay that may be too long or short for your flight. Use the UDDT to drill the delay element to the correct length. Common mistake: drilling too deep, which can cause the ejection charge to fire early. Measure twice, drill once.
3. Drill the Delay: Insert the delay element into the UDDT. Follow the tool's instructions to remove the precise amount of material for your target delay. Remove the element and check the depth with a ruler. Common mistake: not cleaning the drilled debris from the delay element. Any leftover dust can affect burn consistency.
4. Add the Ejection Charge: Pour the included ejection charge powder into the delay cavity on the motor. Follow the kit's instructions for the correct amount. Do not overfill—leave a small air gap for proper gas expansion. Common mistake: using too much powder, which can blow the parachute out too hard or damage the recovery system.
5. Seal and Install: Place the provided seal disc or cap over the ejection charge. Ensure it sits flush. The motor is now ready to install in your rocket's motor mount. Check the fit before launch. Common mistake: forgetting to check the motor retention. The DMS case is single-use, so ensure your retainer holds it securely.

Product Details

AeroTech G72DM-14A 29mm x 124mm Single Use DMS 1-Motor Kit - 077214: The AeroTech Disposable Motor System DMS is a single-use motor in kit form assembled by the user. The nozzle and propellant are already installed. You save money compared to fully pre-assembled motors, but you must own a Universal Delay Drilling Tool (UDDT) to set the delay time before adding the ejection charge.
AeroTech G72DM-14A 29mm x 124mm Single Use DMS 1-Motor Kit - 077214