No surprise to understand the Dragon-Fly to be the inspiration for the Helicopter design and invention..
Interesting facts about a Dragon Fly as understood from (and info credits to) http://www.designanduniverse.com :
- The body of a dragonfly looks like a helical structure wrapped with metal. Two wings are cross-placed on a body that displays a color gradation from ice blue to maroon. Because of this structure, the dragonfly is equipped with superb maneuverability.
- No matter at what speed or direction it is already moving, it can immediately stop and start flying in the opposite direction. Alternatively, it can remain suspended in air for the purpose of hunting. At that position, it can move quite swiftly towards its prey.
- It can accelerate up to a speed that is quite surprising for an insect: 25mph (40km/h), which would be identical to an athlete running 100 metres in the Olympics at 24.4mph (39km/h).
- At this speed, it collides with its prey. The shock of the impact is quite strong.
- However, the armory of the dragonfly is both very resistant and very flexible. The flexible structure of its body absorbs the impact of collision. However, the same cannot be said for its prey. The dragonfly's prey would pass out or even be killed by the impact.
- Following the collision, the rear legs of dragonfly take on the role of its most lethal weapons. The legs stretch forward and capture the shocked prey, which is then swiftly dismembered and consumed by powerful jaws.
