Tethered Traffic-Monitoring Drone Design

I need a complete design package—up to a functional prototype—for a tethered drone that can be launched directly from a police cruiser and remain aloft while the vehicle patrols. The aircraft must stay within a 5–6 kg MTOW envelope, draw continuous power through the tether, and deliver two core capabilities: real-time video streaming and reliable license-plate recognition. Thermal imaging is not required.

The system will patrol mixed terrains, so the airframe and tether management mechanism should tolerate both stop-and-go urban streets and extended highway speeds. I’m looking for:

• Conceptual airframe and propulsion layout sized for the stated MTOW, including stability analysis for variable wind conditions.
• Detailed CAD files (STEP or SolidWorks preferred) and a complete BOM with commercially available parts.
• Tether power/data specification—voltage, amperage, cable rating, and spool/retrieval design that fits a typical cruiser trunk or roof rack.
• Camera and onboard computing stack sized for low-latency streaming and local license-plate processing; please include software or SDK recommendations for the recognition algorithm.
• Assembly guide or prototype-ready drawings so a technician can build and flight-test the first unit.

You’re free to suggest proven components—DJI propulsion, Pixhawk, NVIDIA Jetson, etc.—as long as the final package meets weight and performance targets. I don’t have a hard deadline, so take the time needed to engineer a robust, field-ready design. Let me know what prior tethered or law-enforcement UAV work you’ve done and how you’d phase the deliverables from concept through prototype.