Salient White Elephant

June 27, 2009

High Mechanical Efficiency Centrifugally Stable Darrieus Turbine

High Mechanical Efficiency Centrifugally Stable Darrieus Turbine

April 23, 2009

Reciprocating Blimps

Two blimps are moored to each end of a horizontal tube or lattice structure that is near the ground. The tube rotates about a vertical axis that goes through the center of its longitudinal dimension. Each blimp is equipped with a giant light-weight parachute that looks like an old World War II parachute. These parachutes can be opened up to create a high drag profile, or closed to create an extremely low drag profile. When one blimp opens up its parachute, the other closes its parachute. The blimps take turns opening their parachutes in order for the wind to drag alternately drag each in the downwind direction. The reciprocating action of the horizontal mooring tube drives a generator.

Alternatively, perhaps a large “venetian blind” structure hangs from each blimp. The slats in these blinds can be opened up to create near zero drag profile, or closed to create a high drag profile. This variation is modeled after the turbine depicted below:

Here’s an embodiment that uses venetian blind like slats:

One of a Pair of Reciprocating Blimps

Rotary Variation

This is the same idea, except that the horizontal tube rotates instead of reciprocating. As the end of the tube begins its 180 degree “downwind sweep”, the blimp that is moored to it closes its slats to create maximum drag, and the other blimp opens its slats to minimize drag.

Adding HAWT Rotors

Instead of using drag devices, a giant HAWT rotor can be attached to the tail of the blimp. The rotor has very long, very light weight blades that rely on centrifugal stiffening to maintain their extended shape. These minimize drag by feathering their blades, and maximize drag by pitching their blades to a position similar to a HAWT turbine that is producing power. The drag action is similar to the lifting action of an autogyro. In other words, the HAWT rotors are not present to generate power directly. They are only present to control the drag profile of the blimp. On the other hand, perhaps a means can be devised for allowing them to augment the power produced by the system. In order to keep the weight of airborne components to a minimum, they do not produce very much electricity, but they do add a little bit to the electricity that is produced on the ground.

April 11, 2009

Reciprocating System for Transferring Wind Turbine Power Down the Tower

Reciprocating System for Transferring Wind Turbine Power Down The Tower

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