This is not just a flying simulator — it's a laboratory for designing, analyzing, and flying real-world multirotor systems.
RC controller required!
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Why SITL Forge - FPV Laboratory?
- Test motor and prop combinations before buying real hardware
- Predict thrust-to-weight, current draw, and flight time from real spec data
- Validate heavy-lift builds and payload configurations safely
- Learn PID tuning and rate setup with instant, risk-free feedback
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1000Hz Physics, Calibrated to Real Hardware
The VMG (Voltage-Motor-Generator) engine runs a full torque-balance simulation at 1000Hz using Jolt Physics. Component models are calibrated against bench measurements wherever possible:
- 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
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Built-In Flight Controller
Fly out of the box with a built-in PID flight controller in ACRO, ANGLE, and HORIZON modes. Tune PID gains and rates in real time. Perfect for learning, prototyping, rapid testing, and benchmarking a build before committing to real firmware.
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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
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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.
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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
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Extensible With Optional DLC
The simulator is built around an open integration interface. Optional DLC packs add bridges to real flight-controller firmware running in software-in-the-loop mode — the built-in flight controller is replaced with actual firmware while the same physics continues to drive the airframe. Sold separately.
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Who Is This For?
- FPV pilots testing setups before building real drones
- Drone engineers and hobbyists learning multirotor system behavior
- Builders validating heavy-lift and payload configurations
- Anyone curious about the physics behind a quadcopter
