> Model Rockets > Launch Equipment > Misc. : Aerotech Reloadable Motor System 29/40-120 aro91291

Reloadable Motor System 29/40-120

This Model Rocket Motor Reload Kit Contains One Reloadable Motor System (RMS) 29/40-120 Motor Hardware Designed by Aerotech. Federal Law Prohibits the Sale of This Product to Persons Under Age 18.

Aerotech Reloadable Motor System 29/40-120
 Aerotech # aro91291
Retail $69.99  SAVE 7% !
Aerotech Item # aro91291
Specifications :
  • Motor Diameter: 1.13" (29mm)
  • Motor Length: 4.88" (124mm)
  • Assembled Weight: 3.7oz - 5.6oz (104g - 159g)
  • Aerotech Product Number: 91291
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Spotlight Review

"I enjoy this case"
Likely thousands of people have used this case. As for the claim that a cesaroni 2 grain case is $22 with rear closure.... it's not. the closure is another $18. Then the reloads are around $20, whereas the aerotech reloads are 10-15. I'm not bashing CTI here, I own full sets for 29 and 38mm. But the comment bashing the AT 29 40-120 is just out of line. Take your time, put it together properly, clean it well after use, and it's a great investment with many great motors. I own two and am planning to buy more just to save on loading time.

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  • For use with RMS 29mm E, F, G reloads.
  • The RMS 29/40-120 motor hardware can be used with Aerotech's E16, E23, F22, F40, F52, G33, G64 rocket motor reloads kits.
  • Primary use in single stage rockets.
  • They deliver power at the lowest per flight cost available in hobby rocketry.
  • RMS motors produce far less non-biodegradable waste than single-use motors.
  • Reflects the same reliablity, quality, and professional design.
  • Assembly and operation instructions provided.
  • Product warranty policies included.


  • Motor Diameter: 1.13" (29mm)
  • Motor Length: 4.88" (124mm)
  • Assembled Weight: 3.7oz - 5.6oz (104g - 159g)
  • Aerotech Product Number: 91291


  • 29mm Aft Closure
  • 29mm Case
  • 29mm Forward Closure
  • Grease

Requirements & Suggestions

  • Motor Reload Kit (Refer to FEATURES)
  • How To Build a Model Rocket
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Write a Review  View All Reviews
"I've been through two already"
1) These should not cost anywhere near $45 retail. An equivalent Cesaroni Pro29 2-grain casing is $22 retail, including the rear closure. A 3-grain with spacer is roughly $12 more, and then you have 23 different 29mm motors to choose from. 2) In less than 2 years, I've been through two of these, along with two (separately sold) rear closures. The manufacturing tolerances seem to be... questionable, and heaven help you if you don't buy the extra $15 tool to help you screw the rear closure down all the way. 3) Every Aerotech reloadable motor requires 10 minutes of construction -- seal disks, rubber gaskets, grease, etc. In the winter with the wind blowing, there's absolutely zero fun in putting together motors on the field inside these casings. Contrast that with Cesaroni's Pro29/Pro38 series -- literally the hardest thing about the CTI motors is taking the staples out of the cardboard the reloadable motors are packaged in. After that, it's a matter of adjusting the delay and screwing it in. (To be fair, you pay more for this convenience, but the opportunity for failure is also lower.) Putting it in perspective: I _started_ my mid-power rocketry journey with the Aerotech 29/40-120 RMS system. I got one flight in (with supervision from those far more experienced than I) before there were issues that resulted in me having to purchase a second one. I chalked that up to stuff happens, and continued to use up the stockpile of AT motors I'd bought. At the last launch, I decided to use up some more of that stockpile, and the upper seal let go on a baby F53FJ, melting away the upper delay section (metal!) and burning the rocket to ashes on the pad. Net: I'm giving all my AT F/G/H motors and 29/40-120 casing away at the next launch.

"Your gateway to Mid-Power"
skydog (Arizona)
These casings are close to the most fun you can have without an HPR certification. I've never had any kind of problem with these cases, but I AM very meticulous with my assembly and cleanliness. If the wind is blowing hard enough to make assembly difficult, It's probably too windy to fly anyway! Yes, the CTI reload system is easier and quicker, but for me, it's not JUST about saving money... I actually enjoy spending 10 minutes building the motor, because I feel more involved in the final outcome. It is of the utmost importance that the instructions be read and followed exactly. Even though I've assembled dozens of motors, I still keep the instruction sheet open in front of me. There is enough difference between different reloads that it really pays to keep the instructions! All it takes is a pinched O-Ring or loose threading or part misplaced or omitted to destroy your beautiful flying machine. This makes me feel more like I'm actually doing Rocket Science!

"The most versatile MPR product."
If you would like to get started into Mid Power Rocketry, you need to get one of these cases. Buying this will allow you to fly E-G reloads out of a single case. Reloads are very easy to assemble if you follow the instructions the first couple of times. After that, you will be able to do it from memory. In my 10 years in rocketry, I have owned three of these cases. One was lost in a tree some years ago, but the other two are going strong. The G64W reload is one of the better deals in rocketry when purchased from Hobbylinc. This motor will also lift a considerable sized rocket. This is a must have!


  • This reload kit is intended to be used only with AeroTech Reloadable Motor System Kits.
  • Read and follow the safety codes of the National Association of Rocketry (NAR) and the Tripoli Rocketry Association and comply with
  • all federal, state and local laws in all activities with hobby
  • rockets.
  • Damaged or defective reloads should be returned to Aerotech.

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