Quick Answer
Most stuck closures on an AeroTech RMS-29 motor case result from thermal expansion or debris. Try gentle hand pressure first, then a controlled temperature change before applying any tools.
Why Closures Get Stuck
The threaded aluminum closure can seize due to residue from previous reloads, thermal expansion differences between the case and closure, or overtightening. The RMS-29 case uses fine threads that are easy to cross-thread if not aligned perfectly.
Diagnosis and Solutions
- Symptom: The forward or aft closure will not turn by hand. You may feel resistance or hear a grinding sound if cross-threaded.
- Likely Cause: Overtightening, residue buildup, or thermal expansion from a hot motor case. Cross-threading is possible if the closure was not started straight. If the closure was cross-threaded, do not force it. Stop and seek professional help.
- Corrective Action: 1. Let the case cool completely if it was recently fired. 2. Wipe the case and closure threads with a clean cloth to remove residue. 3. Grip the case firmly and try turning the closure counterclockwise by hand. 4. If that fails, warm the case slightly with a hair dryer (not a torch) to expand the aluminum, then try again. If the closure still does not move, stop. Do not use pliers or wrenches, as they can damage the threads.
- Stop or Choose Another Option: If you cannot remove the closure after applying heat and hand pressure, the case may need professional disassembly. Do not hammer or pry the closure. Contact a local rocketry club or the manufacturer for service options. A damaged thread can ruin the motor case. It is better to seek help than to force it.
Product Note
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AeroTech RMS-29 29mm 180 N-Sec Aluminum Motor Case - 2918C: The AeroTech RMS-29/180 aluminum motor case is designed for use with all AeroTech RMS-29/180 high power motor reload kits. Motor reloads are sold separately. Knowing the exact case model helps you identify the correct reload kits and ensures you're working with the proper threads and tolerances for your stuck closure.
AeroTech RMS-29 29mm 180 N-Sec Aluminum Motor Case - 2918C