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Flapping-wing airplanes are envisioned.

UPI NewsTrack

| February 05, 2008 | COPYRIGHT 2004 United Press International. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)Copyright

ANN ARBOR, Mich., Feb. 5 (UPI) -- U.S. scientists are studying birds, bats and insects and their aerobatic efficiencies as a step toward designing flapping-wing airplanes.

University of Michigan engineers said such planes of the future might have wingspans smaller than a deck of playing cards and the aerodynamics of flying animals that can outperform current man-made aircraft.

For example, the engineers note the roll rate of the aerobatic A-4 Skyhawk plane is about 720 degrees per second. The roll rate of a barn swallow exceeds 5,000 degrees per second.

"Natural flyers obviously…

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