Assessment: BetaFPV Meteor75 Professional II Tiny Whoop with DJI O4 Huge Air Unit

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DJI not too long ago launched the brand new O4 Huge Air Unit, and the primary BNF tiny whoop to assist it’s the BetaFPV Meteor75 Professional II. On this evaluation, I’ll take a look at how nicely this micro quad flies, what has modified from the earlier model, and whether or not it’s value shopping for. Its explosive energy genuinely shocked me—in a great way.

Additional Studying:

The place to Purchase

Get the BetaFPV Meteor75 Professional II from:

It’s obtainable 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 individual 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
• Digicam/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 useful 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 seems fairly completely different from the earlier model. The digicam cover has been utterly redesigned for the brand new DJI O4 Huge Air Unit.

Digicam mounting has additionally been drastically simplified. There are not any extra tiny, fiddly rubber bands, which is a change I’m very comfortable to see.

As an alternative, BetaFPV has soft-mounted your complete cover. This method makes extra sense as a result of delicate mounting usually works higher when there may be extra mass concerned. In observe, it seems to work nicely at lowering vibration and jello within the footage.

The digicam tilt angle is adjustable, though the adjustment vary appears pretty restricted. Even so, I discovered it completely enough for each indoor and out of doors flying.

DJI O4 Huge Mounting

Putting in the O4 Huge Air Unit was difficult.

Each the digicam and VTX module are put in contained in the plastic cover, and the cover is connected 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 digicam was soft-mounted, and other people had been having combined outcomes as a result of the digicam alone was too gentle for the delicate mounting to work persistently.

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 suggest doing so. I’d additionally keep away from eradicating the cover except completely essential.

Different Elements

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 adjustments 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.

Flight Efficiency

The earlier Meteor75 Professional was already thought of 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 shocked by how nicely it nonetheless flies.

Total, the Meteor75 Professional II flies extraordinarily nicely. As a result of it’s nonetheless a tiny whoop working on a single-cell battery, it might wobble barely in windy situations. When there may be little or no wind, nonetheless, it’s impressively easy and secure.

And in case you get any minor vibration or wobble in your recorded footage, it may be eliminated in put up utilizing Gyroflow. I examined this, and the stabilized footage seemed glorious, 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 pace. I’d say it’s able to round 80km/h (50mph). For a 1S quad, that’s impressively quick.

It feels noticeably quicker 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 principle purpose is the taller, higher-performance 1102 motors on the Meteor75 Professional II. They make an enormous distinction by way of 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 value: it is vitally energy hungry. In case you fly aggressively and use numerous throttle, count on solely round 3 to 4 minutes of flight time per pack.

Regardless of its energy, it’s also very quiet. You’ll be able to 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 pace, and its extra weight provides it sufficient momentum to be thrown round extra like a bigger freestyle quad, comparable to a 3.5-inch or 5-inch construct, giving it extra “inverted grasp time”.

The prop guard additionally provides 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 way of tight gaps.

By comparability, the Firefly18 feels extra like an outside 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 seek 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 put up, they usually 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 price, weaker batteries would possibly make it much less satisfying to fly on account of 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 occasions, even throughout relaxed cruising. It’s potential that their outcomes had been measured whereas hovering indoors with no wind.

Though the 680mAh battery is comparatively heavy, the Meteor75 Professional II handles it surprisingly nicely. I truly like how the quad flies with this battery.

The bigger pack can ship extra present, which seems to profit efficiency as a result of the quad is so power-hungry. You’ll be able to really feel the additional weight within the air—there may be extra drag and momentum, and the quad slides extra by way 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 needs to be pushed forwards, making the quad nose-heavy.

Until you exchange the battery lead with an extended one, I feel the 580mAh battery is the perfect all-round possibility for out of doors flying.

For indoor flying, I favor the lighter 480mAh battery, because the decrease weight gives 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 adjustments): TBC

How one can Setup

Firmware:

• The FC goal is BETAFPVG473, and it got here loaded with Betaflight 2025.12.5-alpha. The unique CLI diff could 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:

1. Bind the ELRS receiver – One of the best ways maybe is join USB cable to the FC, wait 60 seconds till the receiver goes into WiFi mode (inexperienced LED flashes quickly). Then connect 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/
2. Pair O4 to Goggles 3:
3. Load the ExpressLRS preset in line with your packet price – Directions: https://oscarliang.com/betaflight-presets/#Loading-RC-Hyperlink-Configurations
4. Arrange customized charges – My Charges: https://oscarliang.com/charges/#My-Charges
5. Configure the Modes tab (arm change, turtle mode, and so on.): https://oscarliang.com/betaflight-modes/#How-to-Setup-Arm-Swap
6. Energy tab in Betaflight Configurator: Set the minimal cell voltage to three.2V and the warning to three.4V (land earlier than 3.2V).
7. PID Tuning tab in Betaflight Configurator: In Charges, disable Throttle expo by setting it to 0; If you wish to use Throttle Expo it is best to tune it following this information: https://oscarliang.com/throttle-mid-expo/
8. Arrange OSD, you may copy my CLI traces: https://oscarliang.com/betaflight-osd/#My-OSD-Setup-CLI-Instructions
9. Scale back the present sensor scale to 525 for a extra correct studying

Enhancements You Can Make

You probably have jello, you may attempt HQ triblade props (1.8×1.2×3) – they’re smoother than the inventory props, however barely much less punch.

In case you battle to fly indoor, attempt 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 affords a number of advantages:

• Much less resistance, higher efficiency (extra energy and extra environment friendly)
• Prevents failure on account of unhealthy steel contact

Closing Ideas

The BetaFPV Meteor75 Professional II is without doubt one of 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 nicely with the DJI O4 Huge Air Unit, producing secure footage that responds nicely to Gyroflow stabilisation.

Total, the Meteor75 Professional II is a powerful tiny whoop and I can suggest it. The brand new O4 Huge gives an immersive subject of view and picture high quality, and actually elevates the flying expertise.

Get the BetaFPV Meteor75 Professional II from: