SITL Forge - FPV Laboratory Demo is a free taste of the physics-first quadcopter simulator and engineering workbench. The full 1000Hz simulation engine, calibrated motor models, virtual workbench, OSD, debug graphs, and built-in PID flight controller — no compromises on fidelity, no time limits. Content is limited to two preset drone builds; upgrade to unlock the complete parts catalog and integration with real flight-controller firmware.

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What's in the demo

• Full 1000Hz physics simulation (Jolt Physics with the calibrated VMG motor model)
  
• Built-in PID flight controller in ACRO, ANGLE, and HORIZON modes
  
• PID and Rates tuning with live feedback
  
• Two preset drone builds: a 7" airframe and a 10" airframe
  
• Two calibrated motors and two matched propellers
  
• One ESC stack and one battery
  
• Full OSD, debug graphs, and force / drag visualization
  
• Procedural motor audio generated from RPM, current, and thrust
  
• Joystick and RC transmitter support
  
• FPV camera with lens distortion, chromatic aberration, and vignetting
  
• Bilingual interface: English and Ukrainian

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What the full version unlocks

• Complete parts catalog — dozens of frames, motors, propellers, ESCs, and batteries calibrated to real bench data
  
• Vibration tuning — inject configurable noise into the simulated gyro and accelerometer to stress-test PID stability
  
• Payload simulation — attach and release boxes, tubes, and custom weights mid-flight
  
• Simulation feature toggles — motor thermals, ESC damage, battery wear, motor drag, and more
  
• Optional DLC bridges to real firmware running in software-in-the-loop mode (Betaflight, iNAV, ArduPilot — sold separately)
  
• MSP Bridge for connecting Betaflight Configurator directly to the simulated drone

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Same engine. Same fidelity.

The demo runs the exact same physics, audio, and rendering pipeline as the full version. What you fly here is what you get — only the parts catalog and advanced features are gated.

• 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 computed via virtual wind tunnel with shader-based surface analysis

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Who is this for?

• FPV pilots evaluating whether the simulator fits their workflow before buying
  
• Drone engineers and hobbyists who want to test physics fidelity firsthand
  
• Builders and tinkerers curious about the engine driving SITL Forge

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The demo is fully self-contained — no online activation, no time limits, no recurring prompts. Just install, connect a controller, and fly.