Electric Pinwheels Blade Technology

Inspired by nature, our patented (US Patent 8,430,637) wind turbine blade design flexes without breaking just like feathers on a bird.  This allows us to create the optimum shape for power generation with lightweight materials, resulting in a blade weight 63% lighter than wood or fiberglass.  This reduction of mass allows quicker response to changing wind speed and direction, producing more power in less-than-ideal locations (more) .

  • Attaches without tools in 8 seconds, using three anchor points (more)
  • Energy-absorbing design reduces danger of blade strikes (more)
  • Translucent appearance adapts to ambient conditions, reducing the visual impact on the environment
  • Advanced S809 airfoil maximizes generated power at lower RPM (more)
  • Self-limiting in high winds without fluttering
  • Blades sleeves offered in 6 colors and a transparent polymer

 






More about Blade Technology:

 Attaches without tools in 8 seconds, using three anchor points.....  Typical wind turbine blades are attached with bolts or screws, and may require alignment or balancing.  These bolts and screws also require a specific torque to prevent loosening during operation, however properly calibrated torque wrenches are not found in the typical toolbox.  Attaching blades can take a long time and may not be installed properly, leading to a dangerous out-of-balance turbine and possible catastrophic failure.

Electric Pinwheels' patented (US Patent 8,430,637) blade attaches to the hub by inserting the leading edge spar into a hole and twisting into position (see video to the right).  The spar pulls out slightly to lock the blade angle, while the trailing edge spar is pulled into its receiver block.  Finally the skin anchor piece is pulled over a post and the entire blade is pulled outward.  These three anchor features are designed to be redundant in the unlikely event of failure, adding to the safety of locating the wind turbine close to buildings and people. (back to top)

 

 

 


 

 

 
Energy-absorbing design reduces danger of blade strikes......  The leading edge of the blade deforms locally by compressing the polyester film profile, reducing the overall PSI of impact.  In addition, the trailing edge spar slides inward to allow the entire blade to flex in the axis of rotation.  These two features combine to dissipate the energy of an impact, adding to the overall safety of the system.(back to top)

   




 Advanced S809 airfoil maximizes generated power at lower RPM ...Some of the other small wind turbines use a very thin profile blade that must spin very fast to generate power.  We chose to build an alternator with larger magnets and coils to generate power at a much lower RPM, which requires a blade profile that can maximize power in medium winds and self-limit in higher winds.  The S809 is used on many utility-scale wind turbines for its aerodynamic advantages over other airfoil shapes.  The overall blade profile on an Electric Pinwheel is tapered and twisted to capture power from every inch of the blade. (back to top)


 Lighter blades allow quicker response to changing wind speed and direction...The rotor on a wind turbine acts as a large gyroscope, resisting change in direction as it spins.  Reducing the rotating mass by 63% and moving weight toward the center of rotation has the effect of reducing the moment of inertia by 78%, which is the property that governs the degree of gyroscopic effect.  The picture to the right illustrates a comparison between a wood or fiberglass blade and an Electric Pinwheel blade in terms of this gyroscopic effect.
Lighter blades also have the effect of less wear-and-tear on the bearings, blade structure, and amplitude of vibrations.  (back to top)