BF SITL - FPV Laboratory

BF SITL - FPV Laboratory is a physics-first quadcopter simulator where every motor, propeller, and battery behaves like its real-world counterpart. Validate builds, optimize efficiency, and tune flight controllers with lab-grade accuracy — without risking crashes, burned components, or wasted money.

This is not just a flying simulator — it's a testing environment for real-world multirotor systems.

Why BF SITL - FPV Laboratory?

• Test motor and prop combinations before buying real hardware

• Tune Betaflight with real physics feedback instead of guesswork

• Validate heavy-lift builds and payload configurations safely

• Transfer your tuning directly to real drones

Lab-Grade Physics at 1000Hz

Every motor, propeller, and battery is modeled from real bench test data. The VMG (Voltage-Motor-Generator) engine runs a full torque-balance simulation at 1000Hz using Jolt Physics:

• Motor iron losses (eddy current + hysteresis) calibrated from real dyno data

• Per-propeller thrust and torque coefficients fitted across multiple motor+prop combinations

• LiPo discharge with voltage sag, internal resistance, and state-of-charge tracking

• ESC dead-time losses, timing advance, current limiting, and thermal derating

• Aerodynamic drag via virtual wind tunnel with shader-based surface analysis

• Vibration injection into simulated gyro and accelerometer sensors

Two Modes of Operation

SIM Mode — A built-in PID flight controller with ACRO, ANGLE, and HORIZON modes. Tune PID gains and rates in real time. Perfect for learning, prototyping, and rapid testing.

SITL Mode — Connect directly to real Betaflight firmware running on your PC. BF-SITL Laboratory exchanges data at 1000Hz, allowing you to test real firmware behavior with full physics simulation.

No proxies, no external tools — just launch SITL and connect.

Virtual Workbench

A real-time engineering workspace for building and analyzing quadcopters:

• Thrust-to-weight ratio, max current draw, hover throttle, and flight time estimates

• Throttle sweep analysis with efficiency curves

• Payload attach/detach simulation

• Multiple frame sizes, motors, and propellers based on real-world specs

Procedural Motor Audio

Procedural motor audio generated from RPM, current, and thrust — no samples, fully dynamic. Blade-pass harmonics, electromagnetic whine, aero noise, and sub-bass rumble respond instantly to throttle changes.

Built for Precision

• 1000Hz physics tick rate with Jolt Physics engine

• FPV camera with lens distortion, chromatic aberration, and vignetting

• Real-time OSD: altitude, speed, battery voltage, per-cell monitoring, motor outputs

• Debug graphs for any telemetry channel

• Force visualization: thrust vectors, drag forces, center of mass/pressure markers

• Full joystick and RC transmitter support with per-device mapping

• Session persistence — layouts, builds, and settings saved automatically

Who Is This For?

• FPV pilots testing setups before building real drones

• Drone engineers validating Betaflight firmware via SITL

• RC hobbyists learning PID tuning without risk

• Anyone interested in multirotor physics and system behavior

BF-SITL Laboratory is not affiliated with or endorsed by the Betaflight project. "Betaflight" is a trademark of its respective owners.