{
    "title": "Stabilator / Fre-Wing",
    "inventor_name": "George W. Cornelius",
    "publication_year": 1932,
    "device_name": "Fre-Wing Model PW-1 (NX182W)",
    "goal": "Create an airplane that can automatically adjust its wings to maintain stable flight without pilot input, eliminating stall, spin and sideslip.",
    "problem_addressed": "Conventional aircraft can stall, spin, and require continuous pilot control; fixed wings do not adapt to turbulence or changes in flight attitude.",
    "concept_summary": "The Fre-Wing uses wings hinged at the fuselage that can change incidence automatically in response to aerodynamic loads. Paddle-like \"stabilators\" on the trailing edge set the desired glide or climb angle. The system keeps the aircraft in a self-stabilising attitude, allowing it to take off, cruise and land with minimal pilot action.",
    "detailed_description": null,
    "category": "Aerodynamics & Flight",
    "principles": [
        "Variable-incidence wing geometry",
        "Automatic aerodynamic feedback",
        "Stabilator-controlled glide angle"
    ],
    "scientific_domains": [
        "Aeronautics",
        "Mechanical Engineering"
    ],
    "mechanisms_of_action": [
        "Wing hinges allow the whole wing to rotate up or down, changing lift coefficient",
        "Stabilators act as combined elevators/ailerons to set glide angle",
        "Center-of-gravity placement ensures wings self-correct to prevent loss of speed"
    ],
    "materials": [],
    "energy_sources": [
        "Menasco B-4 internal-combustion engine (125 hp)"
    ],
    "inputs": [
        "Airflow / aerodynamic pressure",
        "Pilot-set stabilator angle (optional)"
    ],
    "outputs": [
        "Lift",
        "Directional steering via rudder",
        "Controlled glide/climb angle"
    ],
    "claimed_performance": "Aircraft cannot stall, spin, or sideslip; can fly itself, land or take off with pilot only cutting engine and setting stabilators.",
    "experimental_evidence": "Test flights in 1931-1932 demonstrated self-stabilising flight, landing without pilot throttle control, and inability to stall.",
    "replication_status": "Only a single prototype (PW-1, NX182W) was built and flown; no independent replication reported.",
    "keywords": [
        "variable incidence wing",
        "stabilator",
        "self-stabilising aircraft",
        "stall-free",
        "pilotless control"
    ],
    "related_technologies": [
        "Variable-geometry wing",
        "Fly-by-wire flight control",
        "Autonomous aircraft"
    ],
    "controversy_level": "low",
    "confidence_score": 0.85,
    "practicability_score": 0.6,
    "fringe_score": 0.3,
    "evidence_strength": 0.5,
    "risk_score": 0.2,
    "trl_estimate": 4,
    "source_urls": [
        "http://www.cloverfield.org/airplanes/NX182W/index.php",
        "http://www.rcgroups.com/forums/showthread.php?t=1644176&page=2",
        "http://1000aircraftphotos.com/Contributions/Visschedijk/12041.htm"
    ],
    "organizations": [
        "Cornelius Aircraft Co.",
        "Cornelius-Hoepli Co."
    ],
    "applications": [
        "Civil aviation",
        "Pilot-assisted or autonomous aircraft"
    ],
    "limitations": [
        "Only one prototype built",
        "No published technical data or peer-reviewed testing",
        "Complex moving-wing mechanisms may increase maintenance"
    ],
    "open_questions": [
        "Long-term structural durability of hinged wings",
        "Reliability of automatic stabilization in extreme weather",
        "Scalability to larger, higher-speed aircraft"
    ],
    "red_flags": [
        "Claims of \"cannot stall\" lack quantitative verification",
        "No independent replication or modern testing"
    ],
    "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.",
        "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.",
        "The design of PW-1 NX182W was an open cockpit, single high-parasol wing, with variable incidence via hinges at the center section. The wing was free to change its incidence."
    ]
}