The design of the winglet on the wingtip of a plane is a multifactor design, it is relatively complicated in the design of an aerofoil due to the influence of no lesser parameters.

In the discussion, emphasis is given to the investigation and applications of principle, speciality and design technology for "wing tip sails", "winglet" and "sheared wing tip",which are three typical wing tip devices.

A linearized mathematical model of a small scale coaxial helicopter with the Bell-Hiller stabilizer bar is extracted from numerical linearization of a non-linear mathematical model with the help of a small perturbation theory.

Adding a tip vane to the blade of horizontal axis wind turbine(HAWT),it can improve the power output of the generator in some scales,and increase power coefficient.

It is important that studying the pressure distribution on the blade and in the adjacent area while searching the power augmentation theory with adding a tip vane to the wind turbine.

The optimal design of civil aircraft winglet with multiple constraint;

It is shown that the direction stability of the model fitted with wings with winglets is better,and suitable winglets can achieve the model s flight distance.

To match these needs,a bigger wing aspect ratio and winglet are adopted as the improvement measures,hopefully the lift-drag ratio of the modified UAV could be increased.

Modification of winglet is adopted to raise the lift-drag ratio of the UAV for extension endurance,for enlarge range and for increase ceiling.

Microsurgery through Lateral Fissure and Insula via Pterional Keyhole Approach for Hypertensive Cerebral Hemorrhage in the Fundus Node at a Super Early Stage;