Acoustics Parameters the Wings of Various Species of Owls

In nature can be found a good examples of effective noise reduction like soft pillows on the bottom of the cat's feet, membranous wings of bats and the specialized structures of owls feathers. These fascinating animals are capable of some amazing physical feats. Additional species of these birds have evolved each with the common characteristic of silent flight. Allows it the special design of owls' wings and feathers. But in nature we found two type of species of owls, called - good seeing and called - good hearing. There are also differences between in shape of leading and trailing edges for the these species of owls. So in this work we checked differences in geometry and shape the edges of the wings of owls by using the Stereo Microscope. Also acoustical parameters were studied for wings of owls and other birds, for low-Reynolds numbers on special constructed stand test with the outlet to the anechoic room.