BETAFPV Pavo Femto Guide: Specs, Weight & O4 Flight
The BETAFPV Pavo Femto is the smallest 2S cinewhoop engineered specifically for the DJI O4 Air Unit: a 75mm, 52.2g quadcopter (O4 included) that records 4K/60fps video with a thrust-to-weight ratio of 6.75:1 and an official flight time of 5:15 minutes on a 2S pack. Built around the LAVA 1102 14000KV motors and the integrated O4 Air Unit Bracket II damping system, it replaces the older Pavo Pico (80.8mm, 73.5g, 4:1 thrust-to-weight, 4:00 flight time on O3) with more power in a smaller airframe. The DJI O4 version costs $204.99 ready to fly, while the PNP version without the HD VTX is $84.99. This guide breaks down the full specifications, the damping upgrades, and how the Femto fits alongside the Pavo Pico II and Pavo20 Pro II.
What Is the Pavo Femto?
The Pavo Femto is BETAFPV’s pocket-size HD cinewhoop, tailored for the DJI O4 Air Unit’s 8g of camera and transmission hardware. Where the original Pavo Pico was designed as a multi-system O3-era platform, the Femto commits fully to O4: the 8g DJI O4 Air Unit sits on the O4 Air Unit Bracket II inside a 75mm whoop frame, recording 4K/60fps through the O4 camera. BETAFPV positions it as “the ultimate 2S 4K pocket drone” — smooth enough for aerial videography, punchy enough for freestyle, and small enough for indoor flying.
It also anchors a three-drone O4 family in BETAFPV’s catalog: the Femto delivers unmatched power and agility, while the Meteor65 Pro O4 and Meteor75 Pro O4 excel at soft, precise flying. If you have read our Pavo Pico II guide, think of the Femto as the more powerful sibling: same 2S philosophy, tighter 75mm frame.
Pavo Femto Specs at a Glance
| Specification | Pavo Femto | Pavo Pico (O3 era) |
|---|---|---|
| Wheelbase | 75mm | 80.8mm |
| Weight | 52.2g (O4 Air Unit included) | 73.5g (O3 Air Unit included) |
| HD VTX | DJI O4 Air Unit | DJI O3 Air Unit (O4 possible with bracket setup) |
| FC | F4 2-3S 20A AIO (STM32F405RGT6, ICM42688P/ICM42605, 16MB blackbox) | F4 2-3S 20A AIO V1 |
| Motors | LAVA 1102 14000KV | 1102 14000KV (2022) |
| Props | Gemfan 1611 3-blade, 40mm | Gemfan 45mm 3-blade |
| Thrust-to-weight | 6.75:1 (with O4) | 4:1 (with O3) |
| Flight time | 5:15 min | 4:00 min |
| Recommended battery | LAVA II 2S 580/680mAh, LAVA 2S 450mAh | LAVA 2S 450mAh 75C |
| Price | $204.99 (O4) / $84.99 (PNP) | $83.99–$111.99 (PNP, discontinued) |
The numbers add up to a decisive generational step: the Femto is 21.3g lighter than the Pico despite carrying a modern air unit, its thrust-to-weight ratio jumps from 4:1 to 6.75:1, and the official flight time grows by 75 seconds. Note that the Pavo Pico is now marked discontinued on its product page — remaining stock is PNP-only, priced from $69.99 (Walksnail/Vista ELRS) to $111.99 (O3 TBS).
52.2g with 6.75:1 Thrust-to-Weight: How the Femto Beats the Pico
Weight is the headline. At 52.2g with the DJI O4 Air Unit included, the Pavo Femto offers more power and performance than the Pavo Pico while redefining what a 2S pocket drone can carry. The gain comes from two directions: the O4 Air Unit itself is lighter than the O3 hardware it replaces, and the LAVA Series 1102 14000KV motors paired with Gemfan 1611 3-blade 40mm propellers and the optimized whoop duct deliver a thrust-to-weight ratio exceeding 6.75:1 — BETAFPV’s comparison against the Pico’s 4:1 shows a 69% improvement.
The motor efficiency figures are unusually detailed for a whoop this size: during steady flights the LAVA 1102 achieves approximately 2.1g/W efficiency thanks to tile-shaped magnets, an optimized magnetic circuit and an improved coil filling ratio; even at peak thrust of 130g it maintains efficiency above 1.5g/W. That headroom keeps the 5:15 minute flight time honest in position hold mode while leaving reserves for aggressive freestyle.
The frame contributes too: the Pavo Femto Brushless Whoop Frame delivers a 4% thrust increase in its compact design, with improved connections between the whoop duct and the carbon fiber plate, added supports for secure assembly, and a reinforced protective structure around the circuit board.
O4 Air Unit Bracket II: Integrated Damping Done Right
Vibration management is where cinewhoops live or die, and the Femto ships with BETAFPV’s next-generation O4 Air Unit Bracket II. The first-generation bracket used separate shock-absorbing components for the O4 camera — lightweight but complex to assemble, and occasionally prone to jello from imperfect installation. The Bracket II introduces a fully integrated system: the camera is secured with four screws, while four soft-mounted shock-absorbing balls (8.8mm) isolate high-frequency vibrations. Since October 23, 2025, all Pavo Femto whoops come with the Bracket II standard.
For pilots upgrading from a Pico, this is the most tangible difference in daily flying: less assembly fiddling, more consistent jello-free 4K footage. Our Pavo Pico II guide covers the same bracket on the 80mm Pico II.
Flight Controller and Power System
The Femto runs the F4 2-3S 20A AIO FC designed specifically for HD VTX duty. Its dual BEC solution provides stable 9V 2A power for the DJI O4 Air Unit and 5V 3A for external devices, so the air unit never browns out at low battery voltage. The board integrates an STM32F405RGT6 MCU, an ICM42688P gyro, 16MB of blackbox memory and onboard Serial ELRS 2.4GHz, with a dedicated 6-pin connector for the O4 and a USB port. The onboard 2-3S 20A BLHeli ESC handles the 14000KV motors with margin.
Two production notes from BETAFPV are worth knowing. From August 2026, the F4 2-3S 20A FC in BETAFPV whoops ships with either an STM32F405 or an AT32F435 MCU — both deliver identical flight performance and are stocked at random. And due to an ICM42688 IMU chip shortage, BETAFPV built compatible firmware for the ICM42605 chip after extensive testing. Neither affects how you fly.
Which battery should you run in the Pavo Femto?
BETAFPV recommends the LAVA II 2S 580mAh or 680mAh batteries, with the lighter LAVA 2S 450mAh as an alternative for minimum weight. The official 5:15 minute flight time is measured in position hold mode and serves as a reference — actual duration varies with flight style, battery performance and environment.
Who Should Buy the Pavo Femto?
Choose the Femto if you want the smallest possible 4K-capable O4 whoop and fly mostly indoors: at 52.2g it is gentle on furniture and people alike, yet the 6.75:1 thrust-to-weight gives it real freestyle authority. Choose the Pavo Pico II for the slightly larger 80mm platform at a lower entry price. Step up to the Pavo20 Pro II (93.9mm, 116.2g with O4 Pro, 3S/4S power) for longer flight times and outdoor punch — our Pavo20 Pro II guide details that decision. For soft, precise cruising, the Meteor75 Pro II O4 and Meteor65 Pro II O4 complete the O4 lineup.
Frequently Asked Questions
How much does the Pavo Femto weigh?
52.2g including the DJI O4 Air Unit, per the official specification — one of the lightest 4K-capable cinewhoops available, and 21.3g lighter than the discontinued Pavo Pico with the O3 Air Unit installed (73.5g).
What flight time does the Pavo Femto get?
The official figure is 5:15 minutes, measured in position hold mode as a reference only. Real-world duration depends on flight style, battery condition and environment — expect less during aggressive freestyle. Recommended packs are the LAVA II 2S 580mAh/680mAh and the lighter LAVA 2S 450mAh.
Is the Pavo Femto compatible with DJI O3 or analog VTX?
No — unlike the Pavo Pico, which supported DJI O3, Walksnail Avatar, Vista and RunCam Link through its split bracket, the Femto is engineered specifically for the DJI O4 Air Unit on the O4 Air Unit Bracket II. If you fly O3 or multi-system hardware, the discontinued Pavo Pico remains the multi-system option in this size class.
What is the difference between the O4 version and the PNP version?
The $204.99 DJI O4 version arrives with the O4 Air Unit installed and ready to bind. The $84.99 PNP version excludes the HD VTX entirely — you install your own O4 Air Unit using the included Bracket II plates, damping hardware and cables. Both share the same frame, FC, motors and props.
Pavo Femto vs Pavo Pico II — which should I buy?
The Femto is the performance pick: 75mm, 52.2g with O4, 6.75:1 thrust-to-weight and 5:15 flight time. The Pico II is the value pick at 80mm with the same 2S philosophy, the 4-screw quick-assembly frame and 6:30 flight time on a 2S 550mAh pack (O4 version). If maximum agility and the smallest footprint matter, pick the Femto; if budget and easy assembly lead, the Pico II.
Which controller pairs with the Pavo Femto?
BETAFPV recommends the LiteRadio 4, LiteRadio 3 Pro, LiteRadio 3 or LiteRadio 2 SE transmitters. The quadcopter has onboard Serial ELRS 2.4GHz, so any ELRS 2.4G-capable radio works after binding; no external receiver is required.
Conclusion: The New Benchmark for 2S 4K Pocket Cinewhoops
The Pavo Femto does exactly what a successor should: it takes the Pavo Pico’s role, cuts 21.3g, raises thrust-to-weight from 4:1 to 6.75:1, extends flight time by 75 seconds, and integrates the O4 Bracket II damping. At $204.99 ready-to-fly with the O4 Air Unit — or $84.99 if you already own one — it is the smallest serious 4K whoop in BETAFPV’s catalog. Check current stock on the official Pavo Femto product page, and browse the full O4 ecosystem in our FPV store.