1.   A spinning cylinder generates lift in direct proportion to the acceleration it imparts on the air streaming by.

2.   Below that speed it is impossible to generate sufficient lift to overload the weak link.

3.   He believes he can generate enough lift to fly on Mars by scaling the Entomopter up to about a meter wingspan.

4.   Instead, its aerofoil shape generates lift.

5.   It begins, Wolk said, when one wing dips down and the plane no longer generates upward lift.

6.   It looks like a dragonfly and generates lift by rhythmically pumping its wings up and down like an insect.

7.   Lockheed Martin officials say the system generates more lift and, because it runs cooler, helps the engine run more efficiently.

8.   To be useful for surveillance, Ellington says, the vehicles would need to generate enough lift to carry an instrument payload and ideally be able to hover.