Changes

| align = "center" bgcolor = "#99ccff4F81BD"|<font color="#FFFFFF">'''Single blade HAWT'''</font>| align = "center" bgcolor = "#99ccff4F81BD"|<font color="#FFFFFF">'''Two blade HAWT'''</font>| align = "center" bgcolor = "#99ccff4F81BD"|<font color="#FFFFFF">'''Three blade HAWT'''</font>

|bgcolor = "#DCE6F1"| It reduces the cost and weight of the turbine. These are rarely used due to tower shadow effects, needs counter weights on the other side of the blade, less stability.|bgcolor = "#DCE6F1"| It requires more complex design due to sustain of wind shocks. It is also less stable. It saves the cost and weight of one rotor blade.|bgcolor = "#DCE6F1"|Modern wind turbines uses three blade concept. Because this structure have hight strength to withstand heavy wind storms. Less effect due to tower shadow. Produces high output|-|[[Image:single.jpeg|center|200px|thumb|Fig 9(a) [http://www.wind-energy-the-facts.org/en/part-i-technology/chapter-3-wind-turbine-technology/evolution-of-commercial-wind-turbine-technology/design-styles.html Single blade turbine]]] | It requires more complex design due to sustain of wind shocks. It is also less stable. It saves the cost and weight of one rotor blade.[[Image:two.jpeg|center|300px|thumb|Fig 9(b) [http://www.trendir.com/green/?start=15 Two blade turbine]]]|Modern wind turbines uses three blade concept. Because this structure have hight strength to withstand heavy wind storms. Less effect due to tower shadow. Produces high output[[Image:three.jpeg|center| 200px|thumb|Fig 9(c) [http://www.china-windturbine.com/wind-turbines-blades.htm Three blade turbine]]]