The Kinney HRH (Hot Rod Helicopter) is an American helicopter that was designed by Robert Kinney and produced by Vortech, Inc in the form of plans for amateur construction.
It features a single main rotor, a single-seat enclosed cockpit with a windshield, skid-type landing gear and a four-cylinder, air-cooled, four-stroke, 165 hp (123 kW) Subaru EJ25 automotive engine.
Its 25 ft (7.6 m) diameter two-bladed Waitman composite rotor has a chord of 8 in (20 cm).
With full fuel of 18.5 U.S. gallons (70 L; 15.4 imp gal) the payload is 239 kg (527 lb).
The HRH can hover in ground effect at 7,000 ft (2,134 m) and out of ground effect at 5,000 ft (1,524 m)[1][2] By January 2013 there was one example, the 2001 prototype, registered in the United States with the Federal Aviation Administration.