Thank you a lot for your clear explanation,Mani!

Hello,everyone! Now ,it is nessary to make my words clear in this way:

The flow caused by a dragonfly flapping wing is characterized as being unsteady and low viscous, that is St>>1/Re, so it can be modeled theoretically. In this way, the flow is simplified to be potential. The aerodynamic effects of time-changing wing flexible deformation are studied with an improved two dimensional panel method, which can be applied to investigate the vortices shedding both from the leading and trailing edges. The results reveal that the aerodynamic force generated by the flexible wing for the duration of downstroke is much greater than that produced by the rigid wing, and the actual amplitude of the wing deformation is proper to reduce the mean aerodynamic power with high lift, which means the actual deformation of the dragonfly wing benefits the longtime forward flight.

Key words dragonfly wing model, forward flapping flight，time-changing wing flexible deformation, aerodynamic effects, theoretical modeling

Thanks for your correction.

Maybe our research needs the evaluation of the experts,besides Mani. I believe that the expert must be met on the website. ^-^

Ladies & Gentlemen:

How i wish our disussion run back to the biomechanics fied!

i wish it isn't becoming a quarrel

Thanks!

I think the damselfly goes faster than the bumblebee

K

I think you wrote it incorrectly diaw: it KREATOR with a K!

The Intelligent design of Heavy Metal, I understand you believe it

K

I knew this butterfly. the frog ate it as the measurments were not repeatable

K.

There are the unknows you known and the unknown known you don't know. I think when you swim you adapt your arm position and movment natural to minimize energy naturally.

K.

But a dragonfly holds 2 wings parallels on the same side of the body and captures an element of fluid between those two wings. The fluid pinched between the two wings has two effects:

1- it is moved backwards so that the dragonfly advances; with the speed of flapping and the visocisity the fluid cannot slip through

2- and it forms an air cushion that the wing cannot compress due to their ligthness and ensure that the wings are not deformed, making them stronger as well

Capture a element of goo or liquid between your hands and try to throw the liquid fast in one direction...

It that what you modelled?

K