The Biro Air Turbine is a compact wind turbine with two sets of contra-rotating blades and a nose cone that are designed to deflect wind toward the blade tips to increase power output for a range of wind speeds. This product is applicable in a variety of locations, including high rise rooftops, communication towers, and on grain elevators. However, it appears that Biro and its products are no longer in service.
SDG 7: Affordable and Clean Energy
Target Users (Target Impact Group)
Household, Small and Medium-sized Enterprises
Distributors / Implementing Organizations
Intellectural Property Type
User Provision Model
Distributions to Date Status
Start up windspeed (m/s)
Power output, min (W at m/s)
Power output, max (W at m/s)
Radius of movement (m)
Description of control system
Installed with inverter for ensuring voltage and frequency output that matches local requirements and wind interface that is a microprocessor controlled load regulator for modulating electrical demand on the turbine. This ensures maximum power generation and prevents the turbine from stalling out or over-speeding due to improper load control.
Produces power at relatively low wind speeds, turbine is smaller and lighter than comparable turbines, low noise and vibration, rugged design, automatically slows down during high winds, microprocessor control for optimum power output.
- Blade diameter: ~3.96m
- Length (nosecone to blades): ~2.13m
- Weight: ~192.8kg
Manufacturer Specified Performance Parameters
Rated power of 6600W at 17m/s (38mph) and 360ª turbine rotation.
Vetted Performance Status
Complementary Technical Systems
Academic Research and References
No Academic References available.
Marchand, Harold. 2013. Wind Powered Apparatus Having Counter Rotating Blades, issued January 15, 2013.
Compliance with regulations
UL 1741 (Inverter safety standard for grid-tied operation met).
Contact efforts for Biro have been unsuccessful. Phone number was unavailable, and they did not respond to emails. It is possible that Biro is no longer a functioning organization, but their products are most likely still in use in the market.