Features
Every feature has been carefully refined. Every detail serves better flight.
Real-Time Architecture
Not optimization, but redesign.
Traditional firmware processes tasks sequentially in a single loop, where any delay affects overall performance. Fidelity X uses a real-time operating system, allowing critical tasks to truly run in parallel:
- Gyro sampling independent from main loop
- Attitude calculation has dedicated priority
- Motor output is always on time
Result: Deterministic response time, regardless of system load.
Filtering System
Signal processing determines flight quality.
Gyro Filtering
Consumer MEMS gyros aren’t perfect—motor vibration, frame resonance, sensor noise all contaminate raw data.
Our filtering system precisely identifies these disturbances while preserving true attitude changes. What you feel is the precise response from clean flight data.
D-Term Filtering
The derivative term in PID is inherently sensitive to noise. We designed a dedicated low phase-shift filter that suppresses high-frequency noise while minimizing phase distortion.
Effect: Motors stay cool, response stays sharp.
Safety System
Always running. Cannot be disabled.
This isn’t an optional feature—it’s our design philosophy.
Signal Loss Protection
Two-stage intelligent response:
| Stage | Trigger | Response |
|---|---|---|
| Stage 1 | Signal loss | Attitude stabilization |
| Stage 2 | Continued loss | Controlled shutdown |
Arming Detection
Before takeoff, the system automatically verifies:
- Sensors functioning normally
- Throttle at minimum
- RC signal valid
- System health OK
Only when everything is ready can you arm.
Control System
Dual-Loop PID
- Outer loop: Angle control, for self-level mode
- Inner loop: Angular rate control, core response source
Rate Curves
Three styles, one choice—yours.
| Curve | Best For |
|---|---|
| Betaflight Rate | Pilots migrating from Betaflight |
| Actual Rate | Pilots who prefer intuitive settings |
| FlightOne Rate | Pilots migrating from FalcoX |
Each axis can independently choose curve type. Mix and match, your call.
Display & Recording
OSD
Driven by MSP protocol, compatible with mainstream VTX. What’s on screen is the information you need:
🔋 Battery voltage ⏱️ Flight time 📶 Signal strength ✈️ Flight mode
Blackbox
Flight data, completely preserved.
Using a time-series compression format based on the Gorilla algorithm, record longer flight data within limited Flash space. Every frame is losslessly saved, supporting deep post-analysis.
Protocol Support
RC Protocols
| Protocol | Frequency | Notes |
|---|---|---|
| CRSF | 150-500Hz | Recommended, lowest latency |
| SBUS | 100Hz | Widely compatible |
Motor Protocol
Bidirectional DShot600
Command transmission and RPM feedback both complete in microseconds. Closed-loop design enables dynamic RPM filtering—precisely tracking motor harmonics, eliminating them in real-time.