Plans for amateur construction were originally supplied by Compcop and today are provided by Vortech.
[1][2][3] The aircraft was designed long before the adoption of the US FAR 103 Ultralight Vehicles rules, including the category's maximum empty weight of 254 lb (115 kg), but nonetheless complies with them.
The aircraft has a standard empty weight of 150 lb (68 kg) and is billed as the "World's Tiniest Homebuilt Helicopter" by the plans supplier.
It features a single main rotor and tail rotor, a single-seat open cockpit without a windshield, tricycle landing gear with main wheels and nose skid and a twin cylinder, air-cooled, two-stroke, single-ignition 40 hp (30 kW) Rotax 447 aircraft engine or Kawasaki 440 snowmobile engine.
[1][2] The plans supplier notes this warning: Vortech offers the G-1 plans as a curiosity for those interested in homebuilt helicopters because of its intriguing size and simplicity; however, Vortech has no direct experience with either the design or flight of this model and so cannot and does not endorse this as a proven aircraft.