Eco Sustainable Village
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Eco Sustainable Village |
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Note: Eco Sustainable Projects Foundation is studying this windmill for prospective use in eco village modules.
"Cloth Windmill"
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.
*Unlike other vertical axis windmills, the "This Windmill" requires no supporting bearing above the rotor. This means that the height of the tower is unrestricted. The higher the tower, the greater the output. Applications The system can be portable, or stationary, and can be made any size to apply to your application and wind conditions. Some of the proposed applications are listed below.
Rural Units for Eco Sustainable Villages Suggested applications:
Urban Units Suggested applications:
Rural and Remote applications
The "Cloth Windmill" can be configured for numerous applications as described on the previous page titled "properties unique...". Below you will see some examples of different tower arrangements and transmission systems suitable for larger applications. Because of the vertical axis and omni-directional properties of this design, appliances can be attached with amazing simplicity. One can choose the form of output such as rotary, reciprocal, straight line, or oscillating with nearly equal facility. Below are thumbnail photos of three examples of tower arrangements and their means of transmission. Double click on the thumbnails for a full size picture. Click on your browsers Back button to return to this page.
Fig. 1 Fig. 2 Fig. 3 Fig. 4 Figs. 1 shows a windmill in which the tower turns with the rotor. An output pulley at the base delivers rotary power directly to the air compressor at ground level. The bottom bearing rests in gimbals supported by two stakes driven into the ground. The windmill can be raised or lowered by one person in less than a minute. This model has a 15' rotor and weighs approximately 75 lbs. including the tower. It is portable and is sometimes used for remote drainage, irrigation, and aeration. Fig. 2 shows a pond aeration system. Three piston pumps provide a continuous flow of air to an air stone in the pond. The entire windmill pump system weighs less than 20 lbs. The tower is thirty five feet high. Fig. 3 shows another configuration whereby the power shaft from the rotor runs through the center of a stationary tower column. The output is at the base as in the previous example. Fig. 4 is of a pivoting A-frame type tower operating a double diaphragm air pump located at the top of the tower. Many
transmission systems and tower arrangements can be easily adapted to this
design.
Contact us with your area profile to evaluate a suitable package for your specific requirement.
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