1. By Misfer Almarri

2.  Have the main rotor shaft and electrical generator at the top of a tower, and must be pointed into the windrotor  Small turbines are pointed by a simple wind van. wind van.  Turbine blades are made stiff to prevent the blades from being pushed into the tower by high winds

6.  Advantages :  1-the turbine collects the maximum amount of wind energy for the time of day and season  2-High efficiency, since the blades always move perpendicularly to the wind,  3-The face of a horizontal axis blade is struck by the wind at a consistent angle regardless of the position in its rotation. This results in a reducing vibration and audible noise.

7.  1. Machine Type: horizontal-axis wind turbine 2. blade form: propeller 3. blade number: 3 pieces 4. blade material: glass fiber reinforced plastic 5. type of generator: permanent-magnet 3 phase AC 6. type of tower: guy wire or free standing

8.  Power: 1000W Blade diameter (m): 3.1 Rated Rotate speed(r/min): 360 Rated speed (m/s): 8 Rated power: 1KW Max power: 1.5KW Output voltage (v): 48 Start up wind speed (m/s): 3 Work speed (m/s): 3-25

9.  VAWTs use different shaped blades. Some recently-developed VAWTs use S-shaped blades.  Below, some pictures of vertical wind turbine.

13.  have the main rotor shaft arranged vertically.  Key advantages of this arrangement are that the turbine does not need to be pointed into the wind to be effective. This is an advantage on sites where the wind direction is highly variable.  VAWTs have lower wind startup speeds than HAWTs.

14.  VAWTs may have a lower noise  The generator of a VAWT can be located nearer the ground,

15.  Disadvantages :  1- Having rotors located close to the ground where wind speeds are lower  2-It is difficult to mount vertical-axis turbines on towers, meaning they are often installed nearer to the base on which they rest