Quick Answer

Install the AeroTech HDK-05 hobby delay kit by placing the correct delay element and spacer into the RMS-18/20 motor case before sealing the closure. This 3-pack is designed for D13-7W motors and is not interchangeable with High Power delay kits.

Why the HDK-05 Kit is Motor-Specific

The HDK-05 is made exclusively for D13-7W RMS reloads (part 41307). Using it with other motors can cause ignition failure or pressure issues. The kit includes three delay elements and spacers, plus O-rings and insulators that come with the reload kit itself.

Installation Steps

  1. 1. Gather the Correct Parts: Open the HDK-05 pack and confirm you have three delay elements and three spacers. Retrieve the RMS reload kit for the D13-7W; it contains the required O-rings and delay insulators. Do not mix HDK-05 parts with High Power delay kits—they are not interchangeable.
  2. 2. Prepare the Motor Case: Insert the delay insulator from your reload kit into the forward end of the RMS-18/20 motor case. Place one delay element on top of the insulator, then add the spacer(s) to achieve the correct delay length per the reload instructions. Check that the delay element sits flush; a gap can cause hot gas leakage.
  3. 3. Seal the Closure: Lubricate the O-ring supplied with the reload kit and install it on the forward closure. Screw the closure onto the motor case hand-tight. Do not overtighten. A dry O-ring may fail under pressure; always lubricate before assembly.
  4. 4. Verify Fit and Test: Gently tug the assembled motor to ensure all parts are seated. If the delay element moves, disassemble and adjust the spacer count. A loose delay element can shift during flight, altering ejection timing.

Product Facts

  • AeroTech HDK-05 RMS-18/20 Hobby Delay Kit (3-Pack) - 43505: The AeroTech HDK-05 is for use with D13-7W (41307) motors and comes with 3 rocket delay elements and spacers. This ensures you have the correct delay length and burn time for your motor, preventing early or late ejection charges.

    AeroTech HDK-05 RMS-18/20 Hobby Delay Kit (3-Pack) - 43505

    AeroTech HDK-05 RMS-18/20 Hobby Delay Kit (3-Pack) - 43505