AT A GLANCE
DM122 offers the current 1:20, 170+ component project; DM121 offers a 1:12, 300+ component dual-spool subject. Let the actual assembly process guide your choice.
The short answer
The DM122 and DM121 both approach the turbofan as a model-building subject, but they represent different project scopes. The current DM122 is listed at 1:20 scale with 170+ components. The DM121 is listed at 1:12 scale with 300+ components.
Choose between them by examining the assembly process and the internal layout you want to study. A larger scale or higher part count can be useful information, but neither tells the whole story of whether you will enjoy the build.
The current models, side by side
| Detail | DM122 | DM121 |
|---|---|---|
| Model subject | Mini turbofan | Dual-spool turbofan |
| Listed scale | 1:20 | 1:12 |
| Listed components | 170+ | 300+ |
| How to evaluate the build | Review its assembly film and product details | Review its assembly film and product details |
These values follow the current TECHING product listings. Check the page for the model you are ordering, particularly when comparing information from another seller or an older video.
Look at what you can identify
Watch the demonstration footage with a specific question in mind: which sections can you recognize, and how clearly can you follow their arrangement? A model’s educational value comes partly from the details that are visible and understandable to you.
Then look at the assembly footage. See how separate parts form a section and how those sections come together. That view can be more helpful for choosing a project than a single dramatic photograph of the finished engine.
Match the assembly process to your interest
The difference between 170+ and 300+ components gives you a useful first comparison. It does not establish a universal beginner-to-expert ranking or a guaranteed completion time. People work at different speeds, and a careful build includes reading, organizing and checking.
If the more compact DM122 layout is the subject you want to examine, start with its guide. If the DM121’s dual-spool subject and greater listed part count appeal to you, take a closer look at that model’s film and documentation.
Check the finished footprint separately
Scale is a useful description, but it is not a substitute for finished dimensions. Compare the listed length, width and height with the space where you want to place the model. Allow room to reach its controls and examine the details. Use the current product listing for those measurements rather than estimating them from the video framing.
Before you make the choice
- Confirm the exact model number, scale and contents on the current product page.
- Check the finished dimensions against your intended display space.
- Review the drive method and operation instructions for the model.
- Watch enough assembly footage to understand the kind of work involved.
Both are model representations. Read demonstrations of motion in that context rather than treating them as evidence of fuel-burning operation or usable jet thrust. Choose the kit whose subject and building process you want to spend time exploring.
Explore both models
For the current images, specifications and availability, explore the DM122 mini turbofan or the DM121 dual-spool turbofan.
For another view before you choose, open the DM122 video guide and the DM121 video guide.
YOUR NEXT STEP
Find the model that fits your curiosity.
Explore the current product details, images and availability in the TECHING collection.
Explore the collection All guides