Operational: June 2026 –
A lightweight 4” build, featuring a small frame that enables flying over longer durations with smooth footage.
Most of my builds are 5″ or 7″ quads, which offer power but they limit the flight window (5-8 mins).This quad aims to bring flight times to 15 – 20 minutes with less weight to carry whilst hiking.
Posts
Posts related to Horg.
Components
Below are the components I have on this quad.
| Part | Manufacturer |
|---|---|
| Frame | Explorer LR O4 PRO Frame |
| Flight Controller | GOKU F722 MINI V2 45A 32Bit 128K Stack (20×20) (AM32) |
| ESC | GOKU F722 Pro Mini V2 45A 32Bit 128K 20X20 Stack |
| Motors | NIN 1404 V2 ULTRALIGHT 2750KV |
| VTX | DJI O4 Pro |
| RX | TBS Crossfire Nano RX |
| GPS | GOKU GM10 Mini V3 GPS w/compass |
| Buzzer | FLYWOO Finder V1.0 w/ LED BUZZER |
| Props | Gemfan 4024 2-4 Inch Propeller |
| Batteries | Flywoo Explorer Molicell P30B 18650 4S1P 3000mAh Lionpack Battery |
Metrics
Various metrics for the drone.
| Metric | Details |
|---|---|
| Weight (quad & props only) | 172 g |
| Weight (quad + 3000 mAh LI-ION battery) | 376 g (+204 g) |
Wiring Reference
Here’s my wiring diagram, with DJI O4 Pro VTX, TBS Crossfire RX, Flywoo GM10 GPS and Flywoo Finder buzzer.
TODO
Construction
The frame comes with pretty basic instructions on how assembly should take place. Here was my first attempt, getting a few of the nuts wrong, and using the DJI O4 mount rather than the DJI O4 Pro mount.
After that, it’s on to fitting the motors.
It’s now time to mount the ESC and perform the only soldering that is required for this build. The following photo shows the soldered battery and motor cables. For space purposes I chose to use a capacitor mounted on the XT30 cable.
The above photo shows the GPS and buzzer cables ready for connecting to the FC, along with the RX chip & cable. All these plug into the FC, which makes the final connectivity more a case of fitting wires in the chassis than a soldering exercise.
The DJI O4 Pro VTX & camera slot nicely into the rear space (with a spacer to allow the power & GPS/Buzzer cables to pass under it), and everything connects into the flight controller.
Complete, weighing 172 gram with props.
Post-build Thoughts
All in all, the Flywoo LR4 frame is a straightforward build with space in the for the essentials.
Pros:
- Light-weight frame that allows packing of all essential items for a long-range build
- If one uses the Flywoo ESC + FC + Buzzer, one can use solder-free connectors for peripherals. This makes assembly much easier given the constrained space
Cons:
- The Flywoo assembly diagram is an exploded view assembly – it could be clearer.
- The selection of nuts + bolts from the kit, the FC+ESC & motors gets the build to 95%. I had to locate 8 x 7mm bolts for mounting the props, and I used scavenged 4 plastic nuts for retaining the FC/ESC stack.
- The difference between the LR4 O4 Pro and LR4 O4 model is the 3D mount for the camera. Providing both in the kit would simplify the purchase options.
- Firmware oddities on the GOKU F722 MINI V2. Betaflight v2025.12.2 did not play nicely with the FLYWOOF722PROV2 “2025.12.4 [31-May-2026]” firmware (it kept on resetting). I had to downgrade to FLYWOOF722PROV2 “4.5.4 [30-May-2026]” firmware.
First Flight Thoughts
The scope for my use of this drone is for easy long-flight cruising. Thus I purchased & configured the drone for using LI-ION 3000 mah batteries with 2-blade props.
The build does pretty well, resulting in smooth 15 minute flights with a 3000 mah LION battery. It struggles a bit in gusty winds, which could be a problem on alpine ridges. However, the drone is super light which makes packing it for hiking a pretty low impact.