Review: BetaFPV Meteor75 Pro O4 Tiny Whoop

I recently got my hands on the BetaFPV Meteor75 Pro O4, and I’m excited to share my experience. This review covers how I installed the O4, set it up, and my flight experience.

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Further Reading:

• What’s DJI O4 Air Unit? https://oscarliang.com/dji-o4-air-unit-lite/
• My Tiny Whoop Recommendations: https://oscarliang.com/best-tiny-whoop/

Where to Buy

Get the Meteor75 Pro O4 whoop from:

• AliExpress: https://s.click.aliexpress.com/e/_oCD6EWm
• BetaFPV: https://oscarliang.com/product-kfb6
• GetFPV (PNP Only): https://oscarliang.com/product-ni9u

It comes in two versions:

• DJI O4 Version: Priced at around $199.99.
• PNP Version (Without DJI O4): Priced at $79.99, but you’ll need to buy your own DJI O4 Air Unit.

To be honest, if you don’t mind extra work assembling the drone, it might be worth getting the PNP version. The DJI O4 is only $109, which means you can save $11 by building it yourself.

Unboxing

I am reviewing the PNP version, which does not include the O4 Air Unit. It comes with all the necessary accessories, including a replacement antenna and an O4-to-FC cable, so you’re ready to install the O4 in the Meteor75 Pro right out of the box—no extra parts or tools required.

The quad weighs 37.2g (including the DJI O4) or 51.4g including a 1S 550mAh battery.

Canopy

The new canopy features a large cutout, allowing for a wide angle adjustment for the O4 camera.

I am quite impressed by the camera’s soft mounting mechanism that BetaFPV has developed—it’s perhaps one of the first “proper” soft mounting solutions for the DJI O4 thus far, which is essential to achieve jello-free footage with the demanding O4 camera.

The mount features a two-piece design—a back piece with two mounting screws on the sides (19mm width, micro FPV camera size) and a front clamp that secures the camera. The two pieces are connected by four vibration-dampening “balls,” which reduce the vibrations reaching the camera.

Flight Controller

Apart from the new canopy and camera soft mounting design, the Meteor75 Pro has also received an upgrade to the flight controller—the Matrix 3-in-1 FC.

It’s designed specifically for the DJI O4 Air Unit (Lite), featuring a connector that plugs directly into the O4 Air Unit without soldering. It’s a 1S board, and as we know, the O4 doesn’t perform well with voltages below 3.7V. Therefore, BetaFPV has added a 5V BEC to this FC, providing enough power for the O4 even at maximum RF power.

There’s 16MB of memory for the blackbox and a total of 4 UARTs available, although only 2 are used.

Just like any BetaFPV tiny whoop, to keep the weight down, there’s no USB port on the FC; to access Betaflight, you’ll need to use BetaFPV’s dedicated dongle.

Motors and Propellers

The Meteor75 Pro O4 is not strictly a 75mm whoop—the diagonal motor distance is actually over 80mm, so it should really be called the Meteor80. The increase in size accommodates larger propellers—these are 45mm tri-blade props, not the 40mm props used in typical 75mm tiny whoops. Due to the extra weight of the DJI O4, larger propellers make sense, as they provide more power and efficiency. To spin those larger props, BetaFPV uses larger 1102 22000KV motors.

Durability

There have been mixed reports from the community regarding durability, mainly due to the DJI O4 Air Unit, not the Meteor75 itself. Some users have experienced malfunctions or damage to the board after a few hard crashes. While I haven’t encountered any major issues yet—since I’ve been flying gently because this is the only DJI O4 I have—I would caution against treating the O4 whoop the same way you would a cheap analog whoop.

Installing DJI O4 Air Unit

Installing your own O4 might sound challenging, especially given the fiddly parts involved in the soft mounting. However, it turned out to be pretty straightforward—as long as you have steady hands. It only took me about 30 minutes to complete the build.

Pro Tip: The O4 camera cable is quite stiff due to the protective tape used, and it can transfer vibration from the frame/canopy to the camera. To solve this, I removed the tape near the camera connector, which exposes the flexible part of the wires. Be extremely careful if you decide to do this, and do not damage the wires in the process.

However, I do have concerns about the threaded tubes on the frame that holds the FC in place. They only extend to the top of the FC silicone grommets (aka gummies) and don’t actually provide any support for the O4 Air Unit when it’s mounted on top of the FC. The O4 gummies are pressed against the FC gummies using longer screws. While this method sort of works, it has its flaws. If the screws are not tight enough, the O4 might have wiggle room—especially during flips and rolls. On the other hand, if the screws are too tight, they will press too hard on the FC gummies, which is not ideal for soft mounting. The frame is injection-molded, and it’s expensive to create a new mold just for a small design change, so I understand why BetaFPV opted for this workaround.

Battery and Flight Time

BetaFPV recommends their LAVA 1S 550mAh LiHV batteries. You can also use the lighter, smaller 450mAh batteries, but flight time is considerably shorter. I am getting around 5 minutes of flight time when flying indoors with the 550mAh battery, and around 3.5 minutes with the 450mAh.

Get some 1S 550mah batteries here:

• • AliExpress: https://s.click.aliexpress.com/e/_DFJK7pH
  • BetaFPV: https://oscarliang.com/product-j5ig

Flight Performance

I have seen several videos of the Meteor75 Pro with O4 from when it was first released, and they all seem to have pretty bad jello. I am not sure if BetaFPV has made improvements to the design because I haven’t noticed any jello or vibration during my indoor testing (I received mine just last week). Also, the way I installed the O4 might have contributed to the improved image quality.

The stock tune worked quite well. I made several changes to the settings to suit my flying style, but overall, the quad was pretty responsive and stable out of the box.

Stabilization seems to work fine as expected, here’s the same footage with 30% stabilization in Gyroflow:

This whoop is quite stable for outdoor flying, but it lacks the power and speed compared to 2S and bigger whoops. In my experience, a tiny whoop at this lightweight easily gets pushed around by the breeze unless you have perfectly windless conditions. For outdoor flying, larger and more powerful models are better suited.

If you want a whoop to fly predominantly outside, I think the BetaFPV Femto might be a better choice, which I am still testing and will publish a review in the next few days comparing it to the Meteor75 Pro.

How to Setup

The FC target is BETAFPVG473, and it came loaded with Betaflight 4.5.1. The original CLI diff can be found here.

1. Bind ELRS Receiver: For some reason, the ELRS receiver won’t go into WiFi mode after waiting a couple of minutes, so I had to bind the receiver using another method. I simply clicked the “bind receiver” option in the receiver tab in Betaflight. Then, on my radio, I went into the ExpressLRS Lua script and selected the Bind option. And binding was done.
2. Pair O4 to Goggles 3:
   • follow instructions here: https://oscarliang.com/how-to-setup-dji-o4-lite/#Pairing-DJI-Goggles-3-with-O4-Lite
   • Useful settings: On the goggles, turn on Race mode to take advantage of the low latency, and use auto channel and power.
3. Modes tab in Betaflight Configurator: Configure the switches for arming, angle mode, and turtle mode.
4. Power tab in Betaflight Configurator: Set the minimum cell voltage to 3.2V and the warning to 3.4V (land before 3.2V).
5. PID Tuning tab in Betaflight Configurator:
   1. Dynamic Idle: Set it to 75 (it was set to 30 for some reason, which is too low; 30 is for 5″ quads).
   2. Rates: disable Throttle expo by setting it to 0

Here are my rates and how to set up rate selection based on your flight mode.

Specifications

• Wheelbase: 80.8mm
• Motors: 1102 22000KV
• Frame: Meteor75 Pro
• Propellers: Gemfan 45mm 3-Blade Propellers
• Camera/VTX: DJI O4 Air Unit (Lite)
• Canopy: Canopy for O4 Air Unit
• FC: Matrix 1S 3IN1 HD FC
• Receiver: ELRS 2.4G
• Recommended Battery: LAVA 1S 550mAh Battery
• Weight: 37.2g

Final Thoughts

When it comes to flying around the house, my overall impression of the BetaFPV Meteor75 Pro O4 is positive, though it does come with some quirks:

Pros:

• Compact and innovative design—from the canopy and soft mounting to the flight controller.
• Good indoor performance with potential for solid outdoor flights in calm conditions.
• Although my review unit works fine with stabilization, I have heard mixed results from other people, especially outdoors. BetaFPV might have fixed this issue in later batches, like the one I reviewed. We need more confirmations from other pilots.

Cons:

• DJI O4 durability concerns have been reported by some users, particularly with frequent crashes.
• Great image quality, but flight performance is certainly not comparable to lighter, analog tiny whoops.

Where to Buy the Meteor75 Pro O4 Whoop

• AliExpress: https://s.click.aliexpress.com/e/_oCD6EWm
• BetaFPV: https://oscarliang.com/product-kfb6
• GetFPV (PNP Only): https://oscarliang.com/product-ni9u

For enthusiasts looking to explore the world of FPV in HD, the Meteor75 Pro O4 is an interesting option with its blend of modern features and compact design. If you’re willing to spend a little time fine-tuning your setup, it could become a reliable tool in your FPV arsenal.