What kind of dragonfly?

Question 1: What kind of dragonfly is light and beautiful?

Question 2: What toothpick is the dragonfly's tail?

Question 3: What shape are the wings of dragonflies? What's the role? Above the leading edge of each dragonfly wing, there is a thick layer of dark cuticle-wing eye, which is a special device for them to eliminate the hidden danger of flapping. Dragonflies will not lose their ability to fly when they remove their wing eyes, but it will affect the correctness of wing vibration and make their flight stagger like a "drunk".

Question 4: What did the ancient dragonflies look like? Only prehistoric and present dragonflies. The prehistoric dragonfly spread its wings nearly one meter, but archaeologists believe that it can only glide, fly not far, and move relatively slowly. It was caused by high oxygen density at that time.

Question 5: How do dragonflies move? The sport of Daquan Dragonfly is flying!

Dragonflies are flight experts among insects. Dragonflies have thin and light wings and a pair of front and rear wings on the left and right. They are light in weight, but they can vibrate 30-50 times per second. Dragonflies fly very flexibly. They can fly quickly, change direction and height quickly, glide slowly at a certain height, or suspend in mid-air, and even fly upside down, sideways, straight up and down. It can be said that they are arbitrary, and even the most modern planes are far from flying.

Dragonfly's extraordinary flying skills are attributed to its developed wing muscles and airbags. The former makes the wings flap quickly, while the latter stores air, which can regulate body temperature and increase buoyancy. Dragonflies fly so freely because the nervous system controls the inclination angle of their wings, which subtly adapts to the flight speed and atmospheric pressure. Because of the different inclination angles of wings, they can not only generate upward lift, but also generate forward or backward thrust, so they can fly freely.

What is the secret of dragonflies and other insects hovering in the air? Cornell University physicist Jane? Wang said, maybe we should not regard insects as small planes, but as swimmers in the air. By simulating the flapping and flashing of dragonfly wings on the computer, Jane? Wang believes that insects use both resistance and lift when flying. Just as people swim by pushing away water, dragonflies hover by pushing the air around them. Jane? Wang said: "The dragonfly's wings first descend, then suddenly contract, then flap upward, gently flap, and then start this round of action again. The large angle formed when the wings go down pushes away a lot of air, and when they come back, the flapping is much shallower, indicating that the air resistance encountered when the wings come back is very small. The same is true when rowing or swimming, and changing the orientation of hands and feet when paddling. " Computer models clearly explain how dragonflies hover, but how do their wings move so that insects can fly back and forth and even turn their bodies over? Some researchers at Oxford University in England are answering this question through experiments. They let insects fly in smoke and found that a single insect will combine four different aerodynamic mechanisms when flying in the air. A better understanding of the flight principle of insects will effectively promote the development of flight technology, such as reducing the resistance on wings and making micro-planes.

Question 6: What kind of dragonfly is light?

Purple dragonfly

Beautiful dragonfly

Question 7: What would happen without dragonflies? Mosquitoes will increase a lot Children will reduce a lot of fun.

Question 8: What does a dragonfly look like? Go to the field to see. They often fly around in the fields, with light bodies, long and transparent wings and big and round eyes.