{
    "title": "Free-Winged Plane Able To Fly Itself",
    "inventor_name": "George W. Cornelius",
    "publication_year": 1932,
    "device_name": "Free-Winged Plane",
    "goal": "Provide an aircraft that can maintain stable flight without conventional ailerons, prevent stall or spin, and require minimal pilot input.",
    "problem_addressed": "Aircraft stall, spin, and the need for complex pilot-controlled control surfaces.",
    "concept_summary": "The invention uses wings that are hinged to the fuselage and can pivot up or down automatically in response to aerodynamic pressure. The trailing-edge \"stabilators\" act as combined elevators and ailerons, while a conventional rudder provides yaw control. The wing pivoting creates a self-stabilising effect that prevents stall and spin, allowing the aircraft to glide or climb with the pilot merely setting a desired angle.",
    "detailed_description": null,
    "category": "Aerodynamics & Flight",
    "principles": [
        "Passive aerodynamic stability",
        "Wing pivoting in response to pressure differentials",
        "Elimination of conventional ailerons",
        "Center-of-gravity placement for inherent stability"
    ],
    "scientific_domains": [
        "Aerospace Engineering",
        "Fluid Dynamics",
        "Mechanical Engineering"
    ],
    "mechanisms_of_action": [
        "Trailing-edge stabilators adjust lift",
        "Rotatable wing mounts allow limited up/down movement",
        "Control wires linked to a stick tilt the wings",
        "Synchronised movement of wings, propeller and tail for steering"
    ],
    "materials": [
        "Aluminum (wing structure)",
        "Steel (bolts, brackets, rollers)",
        "Metal tubing"
    ],
    "energy_sources": [
        "Aviation gasoline (conventional internal-combustion engine)"
    ],
    "inputs": [
        "Aerodynamic pressure on wing surfaces",
        "Pilot-set stabilator angle",
        "Control-stick input (optional)"
    ],
    "outputs": [
        "Lift",
        "Yaw control via rudder",
        "Banking and turning moments",
        "Automatic pitch control"
    ],
    "claimed_performance": "The aircraft cannot stall or spin, can glide or climb automatically when the pilot cuts the engine, and steers itself into a bank while turning using only the rudder.",
    "experimental_evidence": "Popular Science articles (May 1931, July 1932) report test flights demonstrating that the plane \"practically can fly itself\" and that a tail-spin is impossible with the construction. The patent description cites successful experiments showing the wings automatically keep the craft in a position that prevents loss of speed.",
    "replication_status": "Only the original test flights are reported; no independent replication or commercial production has been documented.",
    "keywords": [
        "Free-winged aircraft",
        "Self-stabilising wing",
        "Variable geometry wing",
        "Stabilators",
        "Pilot-less flight"
    ],
    "related_technologies": [
        "Flaperons",
        "Variable-sweep wings",
        "Autonomous UAVs",
        "Passive stability devices"
    ],
    "controversy_level": "low",
    "confidence_score": 0.9,
    "practicability_score": 0.6,
    "fringe_score": 0.3,
    "evidence_strength": 0.5,
    "risk_score": 0.2,
    "trl_estimate": 4,
    "source_urls": [
        "https://www.rexresearch.com/airplane.html"
    ],
    "organizations": [],
    "applications": [
        "Aircraft with reduced pilot workload",
        "Early autonomous or autopilot-assisted airplanes",
        "Training platforms for stability research"
    ],
    "limitations": [
        "Complex moving-wing mechanisms increase maintenance",
        "Reliance on pilot to cut engine for glide",
        "No quantitative performance data provided"
    ],
    "open_questions": [
        "How does the wing-pivot system behave in severe turbulence?",
        "What is the long-term durability of the rotating wing mounts?",
        "Can the system provide sufficient roll control compared with conventional ailerons?"
    ],
    "red_flags": [
        "Lack of independent verification or peer-reviewed data",
        "Claims are largely anecdotal"
    ],
    "evidence_quotes": [
        "\"Successfully demonstrating in test flights that it practically can fly itself, land or take off without the aid of a pilot and cannot stall, spin, sideslip or stunt\"",
        "\"An airplane designed by G.W. Cornelius ... has wings hinged at the front so that the trailing edges can move up and down in response to variations in wind pressure and 'bumps' in the air\"",
        "\"He claims that a tailspin is impossible with this construction, and that the plane will fly virtually without manual control\"",
        "\"Tests showed that the craft cannot stall because the center of gravity is located so as to cause the wings and stabilators automatically to keep the craft in a position that will not allow it to lose flying speed\""
    ]
}