> 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 9% !
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
Trust 1000's of Reviews on Hobbylinc.com
Industry Leading Loyalty Program
Buy - Earn - Save
Website security verified by GoDaddy.
Easy, Quick and Hassle Free Returns for 30 Days
Sign-Up for Specials, Coupons, & More

Spotlight Review

"You need this system!!"
rbeard2 (Dayton, OH)
For anyone considering the move to mid-power, you need one of these versatile reload casings from Aerotech! E16, F22, G79 and many other propellant kits and thrust curves are available for this one case! The instructions are very well illustrated and easy to follow and once you've put or three of the propellant kits together it becomes a piece of cake! I use mine at least once at every launch and if you have a flat surface (my car truck) and a pack of Clorox wipes, you can clean and reload your case between launches in about 5 minutes! Good stuff!

User Gallery

(Pictures shared by our community)
View All Gallery Images  Add Yours Now
User uploaded image
← Swipe To View More →

You Might Also Like

← Swipe To View More →


  • 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
← Swipe To View More →


Write a Review  View All Reviews
"A must have case"
jboldig (Stafford VA)
I bought my first Hobbyline RMS 29/40-120 case in 2003 and have been flying it ever since. A conservative estimate is 120 flights so far and I just ordered another dozen reloads for it. The Yellow silk screen label might be a little worse for wear, but the case itself is just as good as the day I got it. Considering the low cost of the reloads, you can't fly any cheaper than this case. I haven't met any adult rocket hobbyists that don't own at least one of these cases and many of them have two or more.

"Your gateway to Mid-Power"
skydog (skydog538@gmail.com)
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!

"Great, but hard to clean"
I've used this case for five launches now, and every time I have the most difficulty unthreading the forward closure. Even when you assemble the motor properly with lubrication and all, grit and grime gets in the threads somehow. The threads are also very difficult to clean. I don't have similar problems with 38, 54, or 75mm motors. Otherwise, this is a fantastic part and is definitely worth the investment for saving over disposable motors.


  • 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.

Others Also Ordererd

← Swipe To View More →
Savings - Selection - Service
All Hobbylinc