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HeliPump
Higher altitude means stronger and more consistent winds, and therefore more energy output. The HeliPump has two counter-rotating HeliWinds connected to a compressor which drives pressurized air down the central chamber of the lower balloon. An air turbine on the ground converts this pneumatic energy into usable power. The lower balloon does not carry any torque and rotates freely at the support frame. The two major disadvantages of the HeliPump are a 50 percent energy loss in the compressor, air tube, and turbine; and it will be harder to roll up this system onto the spindle.
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