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 > Model Rockets > Launch Equipment > Misc. : Aerotech 29mm RMS MOTOR E F G aro91291


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 29mm RMS MOTOR E F G
 Aerotech # aro91291
Retail $49.95  SAVE 21% !
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

"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!

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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.

"Rocketry's Most Versatile Motor, Bar None"
This is the most versatile rocket motor casing in mid-power rocketry, period, spannng levels E to G with most every propellant formula in the Aerotech arsenal. With proper (and prompt) cleaning and preparation, it will last indefinitely. The aluminum threads on the closures and casing must be thoroughly cleaned of dirt and debris after every use, and I suggest a toothbrush and solvent as needed. Use a liberal application of the recommended synthetic grease on the threads after cleaning. I've only had one CATO with this motor, and that was with the extremely powerful G138 High Power reload, not the mainstream reloads. And the reason was that I didn't apply grease to the liner-less G138's propellant grain casting tube, only to the metal casing. Subsequent assemblies where I DID slather the grease to the G138 grain AND the aluminum casing resulted in perfect performance of the motor casing with no perforation or even scorch marks. I now do this with the outside surface of the liner for all Aerotech reloads, and have found that it helps ensure success. The grease acts as a heat barrier and coolant between the burning propellant and the aluminum skin. Also, assembly-wise, you MUST be sure the installed propellant grain liner can slide easily within the metal casing prior to installing the closures. If it can't, the fore or aft o-rings might not compress properly, giving the flame a direct pathway to the metal casing, which could result in a breach and some pretty spectacular (and disappointing) pyrotechnics bringing down your missile prematurely. If it's too tight a fit, simply peel off the outermost layer of spirally-wound paper from the liner, grease the new outer layer heavily, and retry the fit until the liner slides easily within the casing. This will ensure the o-rings do their job of exiting all that high-pressure propellant flame out the nozzle--NOT the nose cone. Good skies!

"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.


  • 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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