FS-2" IRIS 38mm: Key Specs and Build Considerations
By High Power Model Rocketry | Published: 2026-10-30
Category: Buying Guides
Get the essential specs for the LOC Precision FS-2" IRIS 38mm fin set and learn what to consider when building or upgrading your high-power rocket.
Quick answer
The LOC Precision FS-2" IRIS 38mm fin set is a cost-effective upgrade for builders with a compatible 2-inch IRIS airframe and 38mm motor mount, offering four precision-cut fins to complete your build.
Why choose the FS-2" IRIS 38mm fin set?
This fin set is designed specifically for the 2-inch IRIS rocket with a 38mm motor mount. It includes four fins to complete your build, making it a straightforward addition if you already have the airframe and motor mount ready. The set is from LOC Precision, a brand known for high-power rocket components.
Compatibility considerations
The FS-2" IRIS 38mm only fits 2-inch IRIS models with a 38mm motor mount. If your rocket uses a different airframe diameter or motor mount size, this fin set will not work. Ensure your build matches these specs before purchasing.
Build considerations
Installing fins requires careful alignment and bonding. The set includes four fins, but you will need to supply your own adhesive and possibly a fin alignment jig. The fins are pre-cut, saving you time, but you must still sand and prepare them for a strong bond.
Decision rules for the FS-2" IRIS 38mm fin set
- Check your airframe diameter: Measure your rocket's body tube. The fin set requires a 2-inch diameter airframe. If your tube is larger or smaller, this set won't fit.
- Confirm motor mount size: The fin set is designed for a 38mm motor mount. Verify your motor mount tube is 38mm or use an adapter if needed.
- Plan your fin installation: You will need epoxy or another high-strength adhesive, a fin alignment jig, and sandpaper to prepare the fins. The set does not include these supplies. Gather your tools and adhesives before starting the build.
Product facts
- FS-2" IRIS 38mm: This fin set is designed for the 2-inch IRIS rocket with a 38mm motor mount. It includes four fins to complete your build. It simplifies your build by providing ready-to-use fins that match the airframe, so you don't have to cut them yourself.
FS-2" IRIS 38mm
Is this fin set right for you?
Best for
- Builders with a 2-inch IRIS airframe and 38mm motor mount who want a cost-effective fin set
- Modelers who prefer pre-cut fins to save cutting and shaping time
Not for
- Rockets with airframe diameters other than 2 inches
- Builds using motor mounts other than 38mm without an adapter
