This article gives good information about the insect flight:
http://en.wikipedia.org/wiki/Insect_flight
Understand that basically there are 2 types of insect flights:
a) Direct
b) Indirect
Dragon flies are from very long time ago.. probably longer than dinosaurs.
Reynolds number (Re) - need to look further into this.
Re ranges from 10 (low turbulance - small insects) to 10000 (high turbulance - large insects)
Insects range from .02g to 3g (grams)
mass is directly poportional to wing area
mass is inversly proportinal to beat frequency
needs more reading....
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