Groen Brothers Aviation
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| Aircraft manufacturer | |
| Traded as | OTC Pink: |
| Industry | Aviation |
| Founded | 1986 |
| Founder | David and Jay Groen |
| Headquarters | Salt Lake City, Utah, United States |
| Subsidiaries | American Autogyro |
| Website | groenaeronautics.com |
 GroenAviation's channel on YouTube
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Groen Aeronautics Corporation, formerly Groen Brothers Aviation, Inc., is an American autogyro research and development company based in Salt Lake City, Utah. The company was founded in 1986 by David Groen and his late brother Jay Groen. David Groen remains the company Chairman, President and CEO.
In 2001, Time magazine listed GBA's Hawk Gyroplane as one of their featured "Inventions of the Year."
Groen Brothers Aviation started out by incorporating helicopter design components into autogyro design. They added helicopter-style collective pitch control which allowed their aircraft to achieve vertical takeoff and landing and to stabilize flight at high and low speeds.
The company holds three US patents and several international patents associated with their variable pitch rotor system. Following the first flight of their proof-of-concept aircraft in 1987, the company flew several larger prototype autogyros during the 1990s.
In September 1999 the company flew their first piston-engine powered prototype of the four-seat Hawk 4. The turbine-engined prototype first flew in July 2000, with a Rolls-Royce 250 420 hp (313 kW) turboprop engine and was the world’s first turbine powered gyroplane. The design's rotor blades used a company-developed natural laminar-flow airfoil.
In 2002, the company provided the Utah Olympic Public Safety Command (UOPSC) a Hawk 4 prototype for perimeter patrol around the Salt Lake City International Airport during the 2002 Winter Olympics and Paralympics. The Hawk 4 completed 67 missions over 75 hours of flying time during the 90-day contract.
In February, 2003, the company introduced its “Stabilization Augmentation Kit,” designed to improve in-flight stability and safety for kit gyroplanes on the market. The company entered the kit market with the Sparrowhawk. The company discontinued Sparrowhawk kit production, but formed American Autogyro, as a subsidiary to produce and sell Sparrowhawk kits as a separate business.
In November, 2005, the US Defense Advanced Research Projects Agency (DARPA) selected a company-led team to design a proof-of-concept high-speed, long-range, vertical takeoff and landing aircraft designed for combat search and rescue. The project was named the “Heliplane” by DARPA and intended to meet economy and performance goals not achievable by existing aircraft. The company completed work for Phase I of the project in 2009, but the project has not been further funded.
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