Kinney HRH

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. The aircraft was first shown at Sun 'n Fun in 2002.

Design and development
The HRH was designed to comply with the US experimental – amateur-built rules. 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 Subaru EJ25 automotive engine. It is the high power to weight ratio that gives the aircraft its name.

The aircraft fuselage is made from a mix of welded 4130 steel tube and bolted-together aluminum tubing, with a composite cabin shell. Its 25 ft diameter two-bladed Waitman composite rotor has a chord of 8 in. The tail rotor has a 46 in diameter. The aircraft has an empty weight of 1000 lb and a gross weight of 1350 lb, giving a useful load of 350 lb. With full fuel of 18.5 u.s.gal the payload is 239 kg. The HRH can hover in ground effect at 7000 ft and out of ground effect at 5000 ft

Operational history
By January 2013 there was one example, the 2001 prototype, registered in the United States with the Federal Aviation Administration.