produce power when the airfoil pulls a tether line. The torque and velocity of the tether cable produces electricity by spinning a generator which is attached to a rotating winch drum. As illustrated in Figure 3, there are two distinct modes of operation—the traction phase and the recovery phase. In the traction phase, the airfoil slowly pulls the tether line and electricity is produced until the maximum tether length or altitude is reached. Then the recovery phase begins; the airfoil is flown back while the tether cable is winched in. Recovery actually uses a small amount of power as the generator becomes a motor drive to retract the cable. Then the process repeats.
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