They found that the best position for gliding had the back two wings in a position similar to that of a flying squirrel.
VOA: special.2010.03.16
Rather than use fixed turbines to generate power, Makani has been experimenting with "flying wings" adorned with several smaller turbines that act as propellers as the craft takes off.
Engineers are developing giant solar-powered flyingwings that are remote-controlled and designed to remain aloft at high altitudes for weeks, months, or even years -- nonstop.