Estes 9753 Pack of Two 24-Millimeter to 29-Millimeter Engine Adapters, Paper Motor Adapters, Rocket Model Accessories for Ages 10+

I bought this set so I can fly my Estes Prowler and Majestic kits from smaller fields with E12-4 motors. These adapters are super easy to use. Each has two halves with an outside flange at one end. Load your motor inside one half with the nozzle at the flanged end, then snap the other half over it. It's now ready to slide into your 29mm mount. The flange will prevent loading the motor in backwards and serves as a thrust ring. Now just screw on the retainer cap, or if you're using it in other than an Estes rocket; snap the motor clip over the end. That's it! MUCH FASTER than paper adapters and masking tape!! They've even included a heavy paper spacer to put in front of the motor if you're using the shorter "D" motors. Includes 2 complete adapters with spacers for this price. Every mid-power flyer should have a set of these adapters. It's especially good for a way to fly your Estes Pro Series II rockets on smaller fields.

Works great for using different sized model rocket engines.

This works great for using an e engine in a 29 mm size motor tube. IT also has an adapter ring for D engine which are shorter in legnth to keep the engine from sliding around

Soso

Great

Good, cheap motor adapters. Nice that they come with spacers for Estes D motors. Has a thrust ring and slots for non-Estes E motors (like Econojet). Only flown it once, held up just fine. Hopefully it'll last many launches and if not, I'll just get more for low cost.

Works as intended. If the wind is blowing in the wrong direction, I will use this in my Majestic rocket with a D12-5 so that it doesn’t float off into the forest. On calm days I just use a F15-8 and have fun!

I think this will work well for the pretty old rocket I'm refurbishing. I've had to do some motor mount modifications and it looks like this adapter will work well to allow smaller motors to fit. I gave it 4 stars because I wish it would clamp together so there aren't so many pieces to try and fumble with while getting it all into the rocket. I think tape will be my friend for that. Hoping to try it out in December. Fingers crossed for a good result.