2025 FPV Drone Build DJI O3 ELRS - Step-by-Step

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Relax and unwind with this unique FPV non talking drone.
⭐️My 1st Year FPV:
😳 3D-Printed Micro 18650 FPV Drone:

No talking, just the soothing sounds of the build process – perfect for unplugging and immersing yourself in the world of building an FPV drone at home.

About this Build:
- Frame: FlyFishRC Volador VX3.5 O3 *
- Motos: EMAX RS1606 3300KV *
- Receiver: HappyModel EP1 EP2 RX 2,4G ExpressLRS *
- FC: Diatone mamba f740 WIFI *
- Racewire: RGB Tiny Racewire LED *
- VTX: DJI O3 Air Unit *
- Battery: Tattu R-Line 4S 850mah XT60 * (XT30)
- Props: Gemfan Hurricane 3630 *
- TPU Antenna mount:
- Soldering station: *
- Flux: *

Accessories:
- DJI Integra: *
- DJI O3: *
- Remote Control: *
- Best DJI Goggles Face Mask: *
- Battery Charger: *
- Electric Screwdriver: *

Links marked with a * are affiliate links. If you make a purchase through these links, I earn a small commission at no extra cost to you.


❌ My biggest Mistake:
👉 5-INCH Build:


Timestamps:
00:00 Unpacking
00:48 Frame Assembly
05:50 1606 Motors + Racewires
07:19 Mamba FC + ESC
08:42 Soldering FC + XT60
09:05 Soldering Capacitor
09:42 Soldering Motors
12:07 The Moment of Truth: Smoke Test
12:22 Radiomaster EP1 ELRS Receiver
13:19 DJI O3 Air Unit
17:39 Wrapping Up the Build
18:06 Props with Nut-Mount
19:28 SBUS Wire DJI O3
19:46 Final Look

In this video, we’re building a 3.5-inch FPV freestyle drone that’s powered by a 4S battery and features the DJI O3 Air Unit for top-notch video quality. The process kicks off with an unboxing, where you get to see all the components that will come together to create this beast.

Once we’ve got everything out of the box, we start assembling the frame. Putting this frame together is incredibly smooth and easy, which makes the build experience that much more enjoyable. Next, we move on to the motors. I’m using the EMAX RS1606 3300KV motors, which were originally in my AOS35, and they come with RaceWires pre-installed. These motors are insane — they’ve got serious power and provide the perfect balance for freestyle flying.

After the motors, we jump into the heart of the build — the Mamba All-In-One stack. We solder on the XT60 connector with the capacitor, and I’ll show you some tips for making sure everything’s soldered perfectly. A good soldering iron with plenty of heat and a thick tip is key for this part, and don’t forget — flux is your best friend. Once that’s done, we solder the motors to the flight controller, double-checking everything with the Smoketester to make sure there are no mistakes in the wiring.

Next up, we install the ELRS receiver — I’m using the HappyModel EP1 RX running at 250Hz. This setup is more than enough for ELRS freestyle. Finally, we mount the DJI O3 Air Unit, but we also remove the SBUS cable since we’re using ELRS instead of a DJI controller.

Stay tuned for the full process as I walk you through each step of this exciting FPV build. You won’t want to miss the final test flight where we push this drone to its limits!

#fpvbuild #djio3 #fpvdrones #dronebuild #quadbuild #flyfishrc #volador