Flywoo Flybee 20 HD (DJI O4)
Flywoo
Open-prop 2S toothpick with a full DJI O4 air unit — outdoor HD cruising, not indoor whoop flying
The Flybee 20 HD O4 puts a full DJI O4 air unit on the 2-inch, 85mm open-prop Flybee airframe: a 47.6g 2S toothpick-style that is essentially a ductless FlyLens 85, aimed at outdoor HD cruising with notably better flight time than its 1.6-inch sibling.
The full story
The build pairs a full DJI O4 air unit and camera with Flywoo's GOKU F405 HD 1-2S V2 (STM32F405, ICM42688P gyro) on a 2-inch carbon X-frame, with the camera on a 3-point shock-absorbing platform to reduce jello. ROBO 1003 14800KV motors — the same as the Flybee 16 — swing much larger Gemfan 2015 bi-blade props, which is where the extra efficiency comes from.
It is an open-prop pusher, not a whoop: exposed props favor efficiency, speed, and quiet at the cost of indoor and around-people safety, and the low-slung pusher props complicate takeoffs, landings, and turtle-mode recovery. Flywoo quotes 5:30 on a 2S 550mAh and 7:30 on a 750mAh.
The control link is a choice of three: a serial () 2.4GHz receiver that updates through the ExpressLRS Configurator, a DJI option that binds directly to a DJI radio through the O4 air unit, or a TBS Crossfire build. A 'Drone Kit (without O4)' variant is also sold — that is a PNP airframe with no video system, not a flyable configuration.
Pros & cons
Pros
- Full DJI O4 air unit for native 1080p60 digital HD, on a shock-absorbing camera platform tuned to reduce jello
- 2-inch props on the same weight as the Flybee 16 give notably better efficiency and flight time
- Serial (UART) ExpressLRS 2.4GHz option that updates via the ExpressLRS Configurator, plus DJI-radio PNP and TBS Crossfire choices
Show all 5 pros
- Runs standard XT30 2S packs and ships with TPU mounts, spare props, a UV filter, and tools
- Light for a digital HD 2-inch — essentially a ductless FlyLens 85 over 20g lighter
Cons
- No ducts and fully exposed props make it a poor choice for indoor flying or flying near people
- Low-slung pusher props sit close to the ground, complicating takeoffs, landings, and turtle-mode flips
- Carrying the O4 air unit on a light toothpick leaves little crash headroom
Show all 6 cons
- Requires DJI goggles for the O4 feed; not compatible with analog or goggles
- 85mm with open 2-inch props needs more room than a true ducted whoop
- Complete O4 configurations sell out often; the in-stock 'Drone Kit (without O4)' variant is not flyable
Specs
Retailers & price history
| Retailer | Current | Stock | Lowest confirmed | Highest confirmed | Checked |
|---|---|---|---|---|---|
| Flywoo (direct) | $279.99 | Sold out | $279.99 (2026-08-17) | $279.99 (2026-08-17) | 2026-08-19 |
| Flywoo (flywoo.com storefront) | $324.99 | Sold out | $324.99 (2026-08-17) | $324.99 (2026-08-17) | 2026-08-19 |
| DefianceRC | $279.99 | Sold out | $279.99 (2026-08-17) | $279.99 (2026-08-17) | 2026-08-19 |
| GetFPV | — | unchecked | — | — | — |
Current = cheapest ready-to-fly configuration (video system included, ELRS) tracked at that retailer; sold-out rows show the last listed price. Lowest/highest are from every confirmed scan since 2026-07-02 — the log grows with each stock check.
Replacement parts & batteries
Crash spares that fit this model, checked against the shops like everything else. Batteries show three price tiers — $ lowest, $$ middle, $$$ highest — among compatible in-stock packs.
Batteries
| Part | Price | Availability |
|---|---|---|
| Tattu 2S 450mAh 95C LiHV (Long Type, XT30) $ 2S 450mAh 95C LiHV · XT30 · 62.5×16.2×14.7mm long pack · JST-XH balance |
$7.99 | In stock at ProgressiveRC (Seattle) |
| Gaoneng GNB 2S 550mAh 100C LiHV (XT30) $$ 2S 550mAh 100C LiHV · XT30 · 29g · 12×18×69mm long pack · JST-XH balance |
$10.49 | In stock at RaceDayQuads |
| Flywoo Explorer 2S 550mAh 80C LiHV (2-pack, XT30UP) $$$ 2S 550mAh 80C LiHV · XT30UP (XT30-compatible Amass-sheath pigtail) · sold as 2-pack |
$20.99 | In stock at Flywoo (direct) |
Props
| Part | Price | Availability |
|---|---|---|
| Gemfan 2015 bi-blade 51mm props (1.5mm shaft, 8pk) Gemfan 2015 bi-blade · 51mm (2") · 1.5mm shaft · 8 pack |
$3.99 | In stock at NewBeeDrone |
| Gemfan Durable 2015-2 Bi-Blade 2" Prop (1.5mm shaft) 2015 bi-blade · 2" / 1.5" pitch · 1.5mm press-fit shaft · 8 pack |
$4.99 | In stock at RaceDayQuads |
Motors
| Part | Price | Availability |
|---|---|---|
| ROBO 1003 14800KV motor 1003 14800KV · 1-2S · 1.5mm shaft · 3.3g · sold per motor (5-pack at Flywoo) |
$13.99 | In stock at Flywoo (direct) |
Flight controller
| Part | Price | Availability |
|---|---|---|
| GOKU F405 HD V2 1-2S 12A AIO (serial ELRS 2.4GHz) F405 · 12A BLHeli_S 4-in-1 ESC · serial ELRS 2.4G · 9V BEC · baro + 8MB blackbox · 25.5x25.5 |
$89.99 | In stock at RaceDayQuads |
Chargers
| Part | Price | Availability |
|---|---|---|
| Flywoo EasyPower E24 2S Battery Charger EasyPower E24 · Flywoo's OEM 2S charger for Explorer XT30UP packs (E16/E24 listing; E24 = 2S model) |
$29.99 | In stock at Flywoo (direct) |
| ToolkitRC M450 50W Mini Balance Charger (2S-4S) 50W 5A mini balance charger · charges 2S packs via their JST-XH balance lead (the standard on all XT30 2S whoop packs) |
$47.99 | In stock at RaceDayQuads |