Name: Aerohydro Research & Technology Associates
Address: 3070 Hermitage Rd, Pebble Beach, CA, 93953-2811, USA
Telephone: (831) 521-0587

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One of AHRTA's major business objectives is the development of a new type of hydropower generator which uses oscillating wings to convert the flow energy of rivers and tidal streams into electrical energy. The basic physical principle underlying this generator is well known in aeronautical engineering. An airfoil which is allowed to oscillate in both plunge (pure translation) and pitch (rotation about some axis on the airfoil chord line) can extract energy from the air or water flow if the phase angle between the pitch and plunge oscillations is close to 90 degrees. AHRTA is now in the process of developing a new model with a simpler mechanism to enforce the phasing between the pitch and plunge motion.

Another objective is the development of unconventional propulsion systems for air and water vehicles. Oscillating wings offer certain advantages over conventional propellers in certain applications, such as micro air vehicles (MAVs), like the palm-size MAV. The flapping-wing pair actually act to prevent flow separation and stall on the forewing, making the MAV virtually stall-proof, even at flight speeds as low as 2 m/s, and as a propulsion device, the flapping-wing design is about 60 percent more efficient than rotory-wing designs of the same size. We are now developing a vehicle which is also capable of pure hovering flight, similar to the flight capability of a dragonfly or a hummingbird.

Aerohydro Research & Technology Associates

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