If anyone is wondering why a two kite design is interesting, here's a paper by a colleage of mine: https://lirias.kuleuven.be/bitstream/123456789/398835/2/12-8

If anyone is wondering why a two kite design is interesting, here's a paper by a colleage of mine: https://lirias.kuleuven.be/bitstream/123456789/398835/2/12-83.pdf https://lirias.kuleuven.be/bitstream/123456789/398835/2/12-8... The tether is a surprisingly large component of the system's drag. With the two kite design, most of the tether is stationary.