DJI just lately launched the brand new O4 Huge Air Unit, and the primary BNF tiny whoop to help it’s the BetaFPV Meteor75 Professional II. On this evaluation, I’ll take a look at how effectively this micro quad flies, what has modified from the earlier model, and whether or not it’s price shopping for. Its explosive energy genuinely stunned me—in a great way.
Additional Studying:
The place to Purchase
Get the BetaFPV Meteor75 Professional II from:
It’s accessible in two variations:
- DJI O4 Model: Priced at round $238.99
- PNP Model (With out DJI O4): Priced at $79.99, however you’ll want to purchase your personal DJI O4 Air Unit.
Specs
- Wheelbase: 80mm
- Motors: Freestyle 1102 21000KV Motors (2026)
- Body: Meteor75 Professional II Brushless Whoop Body
- Propellers: Gemfan 1811 3-Blade Props
- Digital camera/VTX: DJI O4 Huge Air Unit
- Cover: Cover II for O4 Air Unit
- FC: Matrix 1S 3IN1 HD FC
- Receiver: Onboard Serial ELRS 2.4G
- Really helpful Battery: LAVA 1S 480/580/680mAh LiHV Battery
- Claimed Flight time: 5:00 (LAVA II 1S 580mAh) / 6:00 (LAVA II 1S 680mAh)
- Weight: 42.2g
Design and Nearer Look
New Cover
The brand new Meteor75 Professional II appears to be like fairly totally different from the earlier model. The digital camera cover has been fully redesigned for the brand new DJI O4 Huge Air Unit.
Digital camera mounting has additionally been tremendously simplified. There aren’t any extra tiny, fiddly rubber bands, which is a change I’m very glad to see.
As a substitute, BetaFPV has soft-mounted your complete cover. This strategy makes extra sense as a result of delicate mounting typically works higher when there may be extra mass concerned. In apply, it seems to work effectively at lowering vibration and jello within the footage.
The digital camera tilt angle is adjustable, though the adjustment vary appears pretty restricted. Even so, I discovered it completely sufficient for each indoor and out of doors flying.
DJI O4 Huge Mounting
Putting in the O4 Huge Air Unit was difficult.
Each the digital camera and VTX module are put in contained in the plastic cover, and the cover is hooked up to the quad utilizing solely 4 rubber grommets. No screws are used.
This mounting system seems to be efficient at minimising vibration and jello. On the earlier design, solely the digital camera was soft-mounted, and other people have been having combined outcomes as a result of the digital camera alone was too mild for the delicate mounting to work constantly.
On the Meteor75 Professional II, the extra mass of the air unit and cover seems to make the delicate mounting way more efficient.
Nevertheless, inserting these tiny rubber grommets into the cover holes is extraordinarily fiddly.
If you should purchase the Meteor75 Professional II with the O4 Huge pre-installed, I strongly advocate doing so. I’d additionally keep away from eradicating the cover except completely mandatory.
Different Parts
The remainder of the quad, together with the AIO flight controller and motors, are much like the earlier Meteor75 Professional, which has already confirmed to be a dependable platform.
I imagine BetaFPV has additionally made some modifications to the body, though the variations are comparatively minor.
Right here’s a pinout diagram of the FC for reference.
Evaluating It with the Earlier Model
The Meteor75 Professional II is heavier than the earlier mannequin, primarily as a result of the brand new O4 Huge Air Unit provides roughly 5g to the construct.
| Specification | Meteor75 Professional II | Meteor75 Professional |
|---|---|---|
| Wheelbase | 80mm | 80.8mm |
| Body | Meteor75 Professional II Body | Meteor75 Professional Body |
| Cover | Blue Cover II for O4 Huge Air Unit | White Cover for O4 Air Unit |
| Digital camera/VTX | DJI O4 Huge Air Unit | DJI O4 Air Unit |
| Motors | 1102 21000KV Motors (2026) | 1102 22000KV Motors |
| Propellers | Gemfan 1811 3-blade | Gemfan 45mm 3-blade |
| FC | Matrix 1S 3-in-1 HD FC | Matrix 1S 3-in-1 HD FC |
| Receiver | Onboard Serial ELRS 2.4GHz | Onboard Serial ELRS 2.4GHz |
| Battery Connector | BT2.0 | BT2.0 |
| Battery Slot | 16.1 × 6.3mm | 16.7 × 6.3mm |
| Really helpful Battery | LAVA II 1S 480/580/680mAh | LAVA 1S 450/550mAh |
| Claimed Flight Time | 5:00 with 580mAh / 6:00 with 680mAh | 5:30 with 550mAh |
| Weight | 41.5g | 37.2g |
Flight Efficiency
The earlier Meteor75 Professional was already thought-about a heavy 1S whoop, so I anticipated the extra weight of the brand new mannequin to noticeably have an effect on flight efficiency.
Nevertheless, I used to be pleasantly stunned by how effectively it nonetheless flies.
Total, the Meteor75 Professional II flies extraordinarily effectively. As a result of it’s nonetheless a tiny whoop working on a single-cell battery, it might probably wobble barely in windy situations. When there may be little or no wind, nonetheless, it’s impressively clean and steady.
And when you get any minor vibration or wobble in your recorded footage, it may be eliminated in submit utilizing Gyroflow. I examined this, and the stabilized footage regarded wonderful, with no jitter or undesirable actions reported in our latest information: https://oscarliang.com/dji-o4-pro-gyro-stabilization-issue/
The Meteor75 Professional II hovers at round 28% throttle.
It doesn’t have GPS, so I can solely estimate its high velocity. I’d say it’s able to round 80km/h (50mph). For a 1S quad, that’s impressively quick.
It feels noticeably sooner than the Flywoo Firefly18, which I estimate tops out at round 60km/h, regardless of being barely lighter and utilizing an open-prop design.
I imagine the primary motive is the taller, higher-performance 1102 motors on the Meteor75 Professional II. They make an enormous distinction when it comes to energy. The quad feels extraordinarily snappy, agile, and way more responsive than I anticipated from such a heavy 1S tiny whoop.
Nevertheless, that efficiency comes at a price: it is rather energy hungry. If you happen to fly aggressively and use quite a lot of throttle, count on solely round 3 to 4 minutes of flight time per pack.
Regardless of its energy, it is usually very quiet. You may barely hear it from round 50 metres away.
It is a wonderful park ripper—arguably much more enjoyable than the Firefly18. It has a lot energy and velocity, and its further weight offers it sufficient momentum to be thrown round extra like a bigger freestyle quad, resembling a 3.5-inch or 5-inch construct, giving it extra “inverted dangle time”.
The prop guard additionally offers it an edge over the Firefly18. It makes it safer to fly round individuals and pets, extra appropriate for indoor use, and offer you larger confidence when flying by means of tight gaps.
By comparability, the Firefly18 feels extra like an out of doors cinematic cruiser. Due to its open-prop design, I’d be extra cautious about flying it near individuals.
One necessary draw back is that the Meteor75 Professional II has no bodily beeper. The motors are additionally extraordinarily quiet (DShot Beacon), so it may be tough to search out after crashing in tall grass.
Battery Choices and Weight
BetaFPV recommends 3 battery sizes: LAVA II 1S 480mAh, 580mAh and 680mAh.
I’ve examined all 3 on this submit, and so they have confirmed to be among the many finest choices of their respective capability courses: https://oscarliang.com/whoop-toothpick-lipo-battery/#1S-LiPoLiHV
You positively need to get batteries with excessive discharge fee, weaker batteries would possibly make it much less satisfying to fly attributable to voltage sags.
Get the 1S 480mAh battery right here:
Get the 1S 580mAh battery right here:
Get the 1S 680mAh battery right here:
Weight with Completely different Batteries:
- With out battery: 42.2g
- With 1S 480mAh: 54.9g
- With 1S 580mAh: 56.3g
- With 1S 680mAh: 58.5g
For comparability, the Flywoo Firefly18 weighs 40.3g with no battery and 57.4g with a 1S 750mAh battery.
Flight Time:
- 1S 480mAh: 3:00-3:30
- 1S 580mAh: 4:00-4:30
- 1S 680mAh: 4:30-5:00
I used to be unable to get wherever near BetaFPV’s claimed flight instances, even throughout relaxed cruising. It’s doable that their outcomes have been measured whereas hovering indoors with no wind.
Though the 680mAh battery is comparatively heavy, the Meteor75 Professional II handles it surprisingly effectively. I truly like how the quad flies with this battery.
The bigger pack can ship extra present, which seems to learn efficiency as a result of the quad is so power-hungry. You may really feel the additional weight within the air—there may be extra drag and momentum, and the quad slides extra by means of turns, but it surely sustains aggressive manoeuvres and punch-outs higher.
Nevertheless, the 680mAh batteries are very lengthy, and the quad’s battery lead is a bit too quick. This prevents the battery from sitting correctly centred within the body, so it must be pushed forwards, making the quad nose-heavy.
Until you exchange the battery lead with an extended one, I believe the 580mAh battery is the perfect all-round choice for out of doors flying.
For indoor flying, I choose the lighter 480mAh battery, because the decrease weight supplies extra exact management.
Customized PID Tune
The inventory PID tune is sweet, however it’s barely too conservative for my style and nonetheless has some room for enchancment.
I plan to retune the quad and share my customized PID and filter settings on Patreon (screenshots of all of the modifications): TBC
Find out how to Setup
Firmware:
- The FC goal is BETAFPVG473, and it got here loaded with Betaflight 2025.12.5-alpha. The unique CLI diff will be discovered right here.
- Onboard ELRS receiver goal is: BETAFPV 2.4GHz AIO RX, Firmware Rev 3.5.6
- ESC Firmware: Bluejay, 0.19, 96kHz (A-X-5)
Setup Steps:
- Bind the ELRS receiver – One of the simplest ways maybe is join USB cable to the FC, wait 60 seconds till the receiver goes into WiFi mode (inexperienced LED flashes quickly). Then hook up with the ExpressLRS RX WiFi community, go to 10.0.0.1 in your browser, and enter your Binding Phrase on the webpage. Element tutorial: https://oscarliang.com/bind-expresslrs-receivers/
- Pair O4 to Goggles 3:
- Load the ExpressLRS preset based on your packet fee – Directions: https://oscarliang.com/betaflight-presets/#Loading-RC-Hyperlink-Configurations
- Arrange customized charges – My Charges: https://oscarliang.com/charges/#My-Charges
- Configure the Modes tab (arm change, turtle mode, and so on.): https://oscarliang.com/betaflight-modes/#How-to-Setup-Arm-Swap
- Energy tab in Betaflight Configurator: Set the minimal cell voltage to three.2V and the warning to three.4V (land earlier than 3.2V).
- PID Tuning tab in Betaflight Configurator: In Charges, disable Throttle expo by setting it to 0; If you wish to use Throttle Expo you must tune it following this information: https://oscarliang.com/throttle-mid-expo/
- Arrange OSD, you may copy my CLI strains: https://oscarliang.com/betaflight-osd/#My-OSD-Setup-CLI-Instructions
- Cut back the present sensor scale to 525 for a extra correct studying
Enhancements You Can Make
When you have jello, you may strive HQ triblade props (1.8×1.2×3) – they’re smoother than the inventory props, however barely much less punch.
If you happen to battle to fly indoor, strive establishing Throttle Mid/Expo : https://oscarliang.com/throttle-mid-expo/
For hardcore pilots, contemplate direct soldering motors to the FC board with out utilizing connectors. It’s not a straightforward modifications because the solder pads are tiny, but it surely presents a number of advantages:
- Much less resistance, higher efficiency (extra energy and extra environment friendly)
- Prevents failure attributable to unhealthy metallic contact
Remaining Ideas
The BetaFPV Meteor75 Professional II is among the strongest and satisfying 1S tiny whoops I’ve examined shortly. Regardless of its comparatively heavy weight, it stays quick, responsive, and surprisingly able to aggressive out of doors freestyle.
The brand new cover and soft-mounting system additionally seem to work effectively with the DJI O4 Huge Air Unit, producing steady footage that responds effectively to Gyroflow stabilisation.
Total, the Meteor75 Professional II is a powerful tiny whoop and I can advocate it. The brand new O4 Huge supplies an immersive subject of view and picture high quality, and actually elevates the flying expertise.
Get the BetaFPV Meteor75 Professional II from:
