greenwindmill home page

Welcome to the "Green Windmill" web site.

Introducing a new vertical axis windmill design for urban and rural applications for home, lawn and garden.
Applications include: Domestic water pumping, pond aeration, fountains, garden irrigation, bird bath fountains, powered wind chimes, and wind driven lawn ornaments.

Table of Contents:

	*Home page* Description and diagrams of how the *"Green Windmill"* works
	*Properties* Unique features and applications of this new windmill design
	*Rural Applications* Illustrated applications for agriculture, aquaculture and remote homes
	*Urban* Illustrated applications for home, lawn and Garden
	Plans & Kits Description of plans and kits available

"Green Windmill"
US Patent # 5,823,749

The system consists of a horizontally suspended square rotor wheel with a square rim supporting four sails that are linked by cables in pairs. The sails are not unlike boat sails except that they reside in a horizontal plane. The linkage of the paired sails control the sails to form preferred shapes as they revolve into and out of the wind. This control adjusts the sails in a symbiotic action that reduces friction and turbulence in the advancing sails and increases drag in the receding sails. The two opposing linked sails produce a scoop and a wing shape. The scoop holds the wind and the wing rides the wind. The linked controls additionally dampen the sail action to insure durability of the sails.

Because the rotor rides the wind, rather than bucks the wind, it requires minimal tower structures and is roof mountable.

The rotor is vibration free because the tower does not interfere with the rotor. The resistance to the wind and the force acting upon the tower is directly proportional to the work load. This design is very durable indeed. It has been shown to withstand wind speeds in excess of 70 MPH without damage. Load sensitive sail cables that break under predetermined loads can protect sails, pumps and equipment in extreme conditions.

As will be seen in the following pages, there are many novel applications made practical as well as fun by this convenient and economical windmill design.

A choice of sails can be used for different performance requirements. Full sails such as the ones shown in the above illustrations produce high starting torque and slower speed. Half sails, in which only the top portion of the sail is employed, produces higher rotor speeds with lower starting torque. Different sail configurations can provide the right combination for a particular application.

Turn the page and see some of the interesting properties and applications created from this new patented design