{
    "title": "Ionoplane: Ion-propelled craft",
    "inventor_name": "Steven Barrett et al.",
    "publication_year": 2018,
    "device_name": "Ionoplane (ionic-wind propulsion plane)",
    "goal": "Provide silent, emission-free flight using solid-state ionic-wind propulsion, eliminating propellers and turbines.",
    "problem_addressed": "Noise, greenhouse-gas emissions, and mechanical complexity of conventional aircraft propulsion.",
    "concept_summary": "A lightweight fixed-wing glider equipped with high-voltage electrodes that ionize ambient air. The resulting ionic wind transfers momentum to the surrounding air, generating thrust without any moving parts.",
    "detailed_description": "The aircraft carries an array of thin conductive wires beneath the leading edge of the wings, charged to ~20 kV (up to 40 kV in later tests). The positive voltage strips electrons from air molecules, creating positively charged ions that accelerate toward negatively charged wires at the trailing edge. Collisions between these ions and neutral air molecules produce a steady \"ionic wind\" that pushes the craft forward. All power electronics, including a lightweight high-voltage converter, are battery-powered and carried on-board. Test flights demonstrated sustained, low-altitude glide of 60 m in an indoor gymnasium.",
    "principles": [
        "Electroaerodynamics",
        "Ion wind (ionic wind) thrust",
        "Coulomb force",
        "Momentum transfer from ions to neutral air"
    ],
    "scientific_domains": [
        "Physics",
        "Aerospace Engineering",
        "Electrical Engineering"
    ],
    "mechanisms_of_action": [
        "High-voltage electrode ionization of air",
        "Acceleration of ions by electric field",
        "Collision-based momentum transfer to neutral air molecules"
    ],
    "materials": [
        "Copper wire (thin electrodes)",
        "Lightweight lithium-polymer battery",
        "High-voltage power converter (silicon MOSFETs, transformer)",
        "Air (ambient fluid)"
    ],
    "energy_sources": [
        "Battery (electrical)",
        "High-voltage converter"
    ],
    "inputs": [
        "Electrical power from battery",
        "Ambient air"
    ],
    "outputs": [
        "Thrust",
        "Ionic wind"
    ],
    "claimed_performance": "Sustained flight of 60 m (197 ft) at an average height of 0.47 m (18 in) with a 5-lb (2.3 kg) aircraft; thrust generated by 20-40 kV electrode array.",
    "experimental_evidence": "Demonstrated in MIT laboratory (gymnasium) and reported in Nature (2018) and MIT News; video documentation available on YouTube; peer-reviewed IEEE paper on high-voltage converter.",
    "replication_status": "Demonstrated by MIT researchers; no independent third-party replication reported in the article.",
    "keywords": [
        "ionic wind",
        "electroaerodynamics",
        "solid-state propulsion",
        "silent aircraft",
        "high-voltage power converter"
    ],
    "related_technologies": [
        "Ionocraft",
        "Electroaerodynamic thrusters",
        "Silent drones",
        "High-voltage power electronics"
    ],
    "controversy_level": "low",
    "confidence_score": 0.9,
    "practicability_score": 0.5,
    "fringe_score": 0.2,
    "evidence_strength": 0.7,
    "risk_score": 0.2,
    "trl_estimate": 5,
    "source_urls": [
        "https://www.dailymail.co.uk/sciencetech/article-6414605/Revolutionary-Star-trek-inspired-ion-propulsion-plane-engine-unveiled-time.html",
        "https://news.mit.edu/2018/first-ionic-wind-plane-no-moving-parts-1121",
        "https://www.youtube.com/watch?v=boB6qu5dcCw",
        "https://www.nature.com/articles/s41586-018-0707-9",
        "https://www.nature.com/articles/d41586-018-07477-9",
        "http://doi.org/10.1109/COMPEL.2017.8013315"
    ],
    "organizations": [
        "Massachusetts Institute of Technology (MIT)",
        "MIT Laboratory for Aeronautics and Astronautics"
    ],
    "applications": [
        "Quiet drones",
        "Hybrid passenger aircraft",
        "Low-noise urban air mobility"
    ],
    "limitations": [
        "Requires very high voltage (20-40 kV) from lightweight battery",
        "Low thrust-to-power ratio limits payload and altitude",
        "Current demonstrations limited to indoor, low-altitude flight"
    ],
    "open_questions": [
        "How to scale thrust for larger, commercial-size aircraft",
        "Improving energy efficiency of the high-voltage converter",
        "Long-term reliability of high-voltage electrodes in atmospheric conditions"
    ],
    "red_flags": [],
    "evidence_quotes": [
        "The five metre (16ft) wingspan glider-like plane has no moving parts and is completely silent.",
        "These wires, which carry a positive charge of 20,000 volts, strip electrons from air molecules, creating an ionic wind that provides thrust.",
        "In the tests, the battery-powered unmanned aircraft, that weighs just five pounds, managed sustained flights of 60 metres (197ft) at an average height of just 0.47 metres (18 inches).",
        "We demonstrate that a solid-state propulsion system can sustain powered flight, opening up possibilities for quieter, mechanically simpler aircraft.",
        "The high-voltage converter provides up to 600 W at 40 kV from a 160-200 V battery input, achieving a specific power of 1.2 kW/kg."
    ],
    "category": "Electromagnetism & Magnetism"
}