There are plenty of reasons: - costs 1): You would need a very different kite to have a turbine hanging in the air. Possibly rigid. They work with a flexible k

There are plenty of reasons: - costs 1): You would need a very different kite to have a turbine hanging in the air. Possibly rigid. They work with a flexible kite, that is possibly much closer to already existing high-performance kites/paragliding wings - costs 2): You will need a much more expensive tether, as you now need to bring down the electricity that you've produced up in the air, while still being able to reliably and safely reel in your kite - costs 3): Something happens in flight during testing, or maybe in production, and the kite comes crashing down. There goes your expensive turbine. - power efficiency: Why would a turbine be necessarily be more power efficient? Action is reaction, so if you are going to remove a certain amount of energy from the air and your kite is stationary, you're going to have to produce a counter-force to stay in place. So how much of the potential energy are you actually using for power generation? Less than half, perhaps? So maybe the pump cycles of a dynamic kite are not that bad after all. Just some thoughts.