{
    "title": "Personal Propulsion System",
    "inventor_name": "Adam Contoret",
    "publication_year": 2014,
    "device_name": "DreamScience electric thruster",
    "goal": "Provide a lightweight, battery-powered thrust unit for personal sports (paragliding, surfing, skiing, snowboarding, etc.) that replaces bulky gasoline engines.",
    "problem_addressed": "Current powered-sport equipment relies on heavy, noisy, and potentially dangerous combustion engines; users need a compact, low-maintenance, instant-thrust solution.",
    "concept_summary": "A high-rpm electric motor drives a fan/propeller housed in a lightweight carbon-fiber/aluminum frame. Power is supplied by a lithium-polymer battery pack. The unit is mounted on a harness and controlled by a thumb throttle or bite switch, delivering up to ~30 kg (~=70 lb) of thrust for a few minutes.",
    "detailed_description": "The DreamScience thruster uses multiple 8-kW electric motors running at ~30 000 rpm to spin carbon-fiber fans. The motors are powered by a high-current (~=700 A at 55 V) lithium-polymer battery. The thrusters are attached to a rigid bar or harness that sits against the front of the user's body. Control electronics allow speed and thrust-angle adjustment. Prototype weights are 8-12 kg with thrust ranging from 25 kg to 40 kg, providing 5-15 minutes of run-time at full power.",
    "category": "Electromagnetism & Magnetism",
    "principles": [
        "Electric motor driving a high-rpm fan",
        "Air-moving thrust generation",
        "Coanda effect shrouds for thrust efficiency",
        "Battery-powered electric propulsion"
    ],
    "scientific_domains": [
        "Electrical engineering",
        "Mechanical engineering",
        "Aerospace engineering"
    ],
    "mechanisms_of_action": [
        "Electric motor converts electrical energy to rotational motion",
        "Fan accelerates air rear creating reaction thrust",
        "Coanda-effect shrouds shape airflow to increase thrust",
        "Battery supplies high-current DC power"
    ],
    "materials": [
        "Carbon fiber",
        "Aluminum",
        "Lithium-polymer (Li-Po) battery cells",
        "Plastic composite",
        "Rubber (high-friction grip material)"
    ],
    "energy_sources": [
        "Lithium-polymer battery"
    ],
    "inputs": [
        "Electrical power from Li-Po battery",
        "User control signals (thumb throttle, bite switch)",
        "Air (ambient)"
    ],
    "outputs": [
        "Thrust force (~=25-40 kg)",
        "Propulsive lift for personal flight",
        "Audio/thermal by (fan noise, heat)"
    ],
    "claimed_performance": "Four 8-kW thrusters produce >100 lb (~=445 N) total thrust; 8 kg unit delivers 25 kg thrust for 5 min, 40 kg thrust for 15 min; demonstrated 50 mph (80 km/h) speed on a snowboard.",
    "experimental_evidence": "Prototype tested by snowboarder Jamie Barrow achieving 50 mph; video demonstration; paragliding test with 25 kg thrust; specifications listed in patent US2013161451.",
    "replication_status": "Prototype tested by individual athletes; no independent third-party replication reported.",
    "keywords": [
        "electric thruster",
        "personal propulsion",
        "fan-based thrust",
        "Li-Po battery",
        "high-rpm motor",
        "Coanda effect",
        "sports equipment"
    ],
    "related_technologies": [
        "Electric jetpacks",
        "Hoverboards",
        "Drone propulsion",
        "Powered paragliding"
    ],
    "controversy_level": "low",
    "confidence_score": 0.92,
    "practicability_score": 0.71,
    "fringe_score": 0.18,
    "evidence_strength": 0.64,
    "risk_score": 0.28,
    "trl_estimate": 4,
    "source_urls": [
        "http://www.gizmag.com/dreamscience-electric-thrusters/31315/",
        "http://www.youtube.com/watch?v=zFHzWofHrwo",
        "https://patents.google.com/patent/US2013161451"
    ],
    "organizations": [
        "DreamScience Propulsion"
    ],
    "applications": [
        "Personal sport propulsion",
        "Paragliding",
        "Surfing",
        "Skiing",
        "Snowboarding",
        "Land-board / kite-replacement"
    ],
    "limitations": [
        "Short runtime (5-15 min at full power)",
        "Battery weight and high current demand",
        "Limited thrust relative to total system weight",
        "Requires further safety and control validation"
    ],
    "open_questions": [
        "How to increase energy density and reduce battery weight?",
        "What are the long-term reliability and wear characteristics of high-rpm fans?",
        "Regulatory classification for personal flight devices?",
        "Scalability to higher thrust levels for heavier users"
    ],
    "red_flags": [],
    "evidence_quotes": [
        "The thruster is a very powerful motor driving a fan, about 30,000 rpm.",
        "Four [motors] draw about 700 amps at 55 volts on full tap.",
        "Weight 8Kg all up with batteries, 5 minutes at full power, 25Kg Thrust.",
        "The Dreamscience thruster design is still in the experimental stages.",
        "Professional snowboarder Jamie Barrow ... hitting speeds of 50 mph (80 km/h)."
    ]
}