SPECTRE
The ultimate entry point into FPV wing flying.
SPECTRE is super stable and easy to control in Angle mode, but switch into Acro and it becomes a compact, lively FPV aircraft built for shooting tree gaps, tight proximity lines and low-level hooning. The current reference setup stays around 215 g with DJI O4 Wide, while the TWIST-derived wing geometry keeps the aircraft approachable enough to learn on without making it something you quickly outgrow.
Digital aircraft package
Includes SPECTRE aircraft files, build guide, BOM, CG guidance, validated FlyingRC F4 Mini INAV setup and free lifetime updates. Other suitable mini fixed-wing FCs can also be used, with board-specific setup where required. No physical parts are shipped.
This is what it is built for.
A real OSD flight from the current DJI O4 Wide aircraft. SPECTRE is stable and easy to settle into, but still compact and lively enough for tight proximity lines, tree gaps and low-level Acro flying.
Fast enough to rip. Slow enough to relax.
Figures from the current SPECTRE 2S twin-1003 / DJI O4 Wide configuration. Flight time varies with flying style and conditions.
Guaranteed compatible battery options: both Flywoo Explorer 750 mAh and 1000 mAh 2S 80C LiHV packs are supported by the current SPECTRE reference configuration.
Core specifications.
The main figures for the current tested SPECTRE configuration.
From printed parts to first flight.
The SPECTRE build guide covers part preparation, removable-wing hardware, motor installation, electronics packaging, wiring, control setup, centre of gravity and the main checks before flight.
From print presets to first flight.
Independent feedback from a SPECTRE builder after printing, building and successfully completing the maiden flight.
Modular by design.
SPECTRE is designed to come apart cleanly rather than relying on permanent wing joints. Each wing panel locates around the main carbon rod and printed WingLoc tabs, then secures with nylon M3 hardware. The result is a more modular airframe that is easier to transport, easier to build around, and much easier to service.
The stability is designed into the wing.
SPECTRE combines progressive wing twist with a tractor-prop layout that deliberately blows the inboard wing. The outer sections run at progressively lower local incidence to keep tip loading under control as angle of attack rises, while the propellers increase airflow over the inner wing whenever power is applied.
Builder feedback after flying SPECTRE.
GhostX built and flew SPECTRE, then shared this feedback in the WUDFLY Discord community. His comments specifically describe SPECTRE's very low-speed capability, gentle landings and how the propellers held up in real use.
Aircraft gallery.
Browse the main aircraft views below. Click the large image or any portrait image to open the full-resolution file.
Core electronics.
The current SPECTRE reference build uses the lightweight 2S twin-motor setup below with a FlyingRC F4 Mini. Both the Flywoo Explorer 750 mAh and 1000 mAh 2S 80C LiHV packs are validated battery options; the 1000 mAh pack is used for the ~215 g reference BOM. Other suitable mini fixed-wing flight controllers can be installed where the physical layout and required I/O match, but their wiring and firmware configuration are board-specific.
| Role | Recommended component | Qty | BOM mass |
|---|---|---|---|
| Battery — reference | Flywoo Explorer 1000 mAh LiHV 2S 80C | 1 | 45 g |
| Battery — validated alternative | Flywoo Explorer 750 mAh LiHV 2S 80C | 1 | ~35 g |
| Flight controller | FlyingRC F4 Mini | 1 | 6.4 g |
| FPV camera | DJI O4 Wide camera | 1 | 8.3 g |
| FPV VTX | DJI O4 VTX | 1 | 5.23 g |
| Motors | Flywoo ROBO 1003 14800KV | 2 | 6.6 g |
| Propellers | Gemfan 2015-2 | 2 | 1.0 g |
| ESC | Flywoo Goku BLS 20A 4S V3 4-in-1 ESC with LED | 1 | 4.5 g |
| BEC | iFlight micro step-down BEC, 2–8S to 5V / 12V | 1 | 1.7 g |
| Servos | DSPOWER 4.3G S002M JR2.54 | 2 | 13.8 g |
| Receiver | RadioMaster RP1 ELRS | 1 | 3.0 g |
| Wiring | Reference wiring allowance | 1 | 9.0 g |
| Printed airframe | LW-PLA / PETG / nylon / carbon structure | 1 | 110.5 g |
Built around the mini fixed-wing FC class.
SPECTRE can accommodate compact fixed-wing controllers including the Core Wing F405 Mini V2, SpeedyBee F405 Wing Mini, Matek F405-WMO, Holybro mini fixed-wing boards and comparable mini wing FCs where footprint, connector access and the required inputs/outputs suit the installation.
The supplied SPECTRE INAV diff-all CLI is for the validated FlyingRC F4 Mini reference setup. Board orientation, firmware target, UART/port mapping, motor and servo outputs, power distribution and INAV settings must be configured for the specific controller installed.
Reference total: approximately 215 g with the Flywoo Explorer 1000 mAh pack. The Flywoo Explorer 750 mAh 2S 80C LiHV is also a validated SPECTRE battery option and is roughly 10 g lighter. Typical sport-flight time is approximately 7 minutes on 750 mAh and 9 minutes on 1000 mAh. Finished-aircraft mass and CG should still be verified by the builder.
What is included
SPECTRE is sold as a digital aircraft package. No physical parts are included.
- Aircraft files
Printable files for the current SPECTRE airframe and aircraft-specific parts. - Build guide
Assembly, wing hardware, electronics installation, CG and pre-flight guidance. - Current BOM
The reference electronics and power-system configuration used for the current aircraft. - Print guidance
Starting-point guidance for the lightweight printed structure and stronger support parts. - INAV setup resources
A comprehensive diff-all CLI file for the validated FlyingRC F4 Mini reference setup, including launch options, reference 2S battery settings, PID tune, rates, mixer/output configuration and differential thrust. Other compatible mini fixed-wing FCs require the correct board target, wiring, port mapping and output configuration. - Free lifetime SPECTRE updates
Future official SPECTRE file, documentation and supported setup revisions remain available to owners.
Free lifetime SPECTRE updates.
Your purchase includes future official SPECTRE file revisions, documentation improvements and supported configuration updates at no extra cost. As additional flight-controller or video-system setups are tested and validated by WUDFLY, compatible SPECTRE support may also be added. Separate aircraft and major new products are not included.
SPECTRE FAQ
Practical answers for builders comparing the aircraft or preparing a SPECTRE build.
What is SPECTRE?
SPECTRE is the FPV branch of the 600 mm TWIST platform, redesigned around a complete onboard video system, removable wings and easier motor installation.
What video system is supported now?
The current tested reference configuration is built around the DJI O4 Wide camera and VTX.
How much does SPECTRE weigh?
The current BOM totals approximately 215 g with the Flywoo Explorer 1000 mAh 2S reference battery. The validated 750 mAh Flywoo Explorer pack is roughly 10 g lighter. Builders should still weigh and balance the completed aircraft.
Are the wings removable?
Yes. The revised platform uses removable wings rather than a permanently glued wing joint.
Which batteries are supported?
Both the Flywoo Explorer 750 mAh and 1000 mAh LiHV 2S 80C packs are validated SPECTRE battery options. Expect approximately 7 minutes of sport flying from the 750 mAh pack and 9 minutes from the 1000 mAh pack, depending on flying style and conditions.
What flight controllers can SPECTRE use?
SPECTRE is designed around the mini fixed-wing flight-controller class. Suitable examples include the Core Wing F405 Mini V2, SpeedyBee F405 Wing Mini, Matek F405-WMO, Holybro mini fixed-wing boards and similar compact fixed-wing controllers where the physical fit, connector access and required I/O are suitable. The supplied INAV diff-all CLI is for the validated FlyingRC F4 Mini reference setup; other boards need their own correct firmware target, wiring, port mapping, outputs and board-specific configuration.
Will more FPV systems be supported?
Yes. Additional video systems are planned, and WUDFLY will also add more validated board-specific flight-controller configurations over time. The airframe itself already targets the broader mini fixed-wing FC class.
Ready to build SPECTRE?
Get the current aircraft files, build documentation, reference configuration and future official SPECTRE updates in one digital aircraft package.