Goal
Produce usable electrical power without conventional fuel by harnessing the Earth's magnetic field.
Problem
Dependence on public electric utilities and the need for a reliable constant-speed motor for aviation.
Concept Summary
The Hendershot device claims to convert energy from the Earth's magnetic field into mechanical rotation, which can then drive a generator to produce electricity. Early versions were described as a motor with a pre-determined constant speed; later work focused on a generator capable of lighting a 120 V bulb, powering radios, televisions, and sewing machines. Demonstrations were reported at Selfridge Field, with army technicians building models that allegedly ran for thousands of hours before the magnet required recharging.
Principles
- Use of Earth's magnetic field as an energy source
- Magnetic induction to produce rotary motion
- Pre-magnetized core to establish a stable field
- Conversion of mechanical rotation to electrical power
Scientific Domains
Materials
- Magnetized iron core
- Copper wiring
- Steel housing
Mechanisms of Action
- Magnetic field lines are cut north-south and east-west to generate torque
- Rotating shaft drives a conventional electromagnetic generator
Energy Sources
Applications
- Independent power generation for homes
- Aircraft propulsion without propellers
- Constant-speed motor for aviation
Claimed Performance
Able to light a 120 V bulb, power a radio, television, and sewing machine for hours; motor speed 1,800 RPM; estimated operational life 2,000-3,000 hours before magnet recharging.
Experimental Evidence
Demonstrations at Selfridge Field in 1927-28; army technicians built a model that ran at 1,800 RPM and was described as satisfactory; anecdotal reports of powering household devices for extended periods.
Replication Status
Demonstrated by U.S. Army technicians; no independent, peer-reviewed replication documented.
Limitations
- Dependence on the relatively weak Earth's magnetic field
- Magnet requires periodic recharging
- No quantitative performance data
- Alleged use of concealed batteries in some models
Red Flags
- Claims of hidden batteries to mask performance
- Lack of peer-reviewed or independently verified data
- Anecdotal evidence and reliance on military demonstrations
- Alleged corporate suppression and conspiracy narratives
