Abstract: A blade for a wind turbine includes a total backward twist of between approximately 6 degrees and approximately 15 degrees between an outer approximately 1 percent to 10 percent of a rotor radius of the blade; and an approximate planform distribution within the following ranges r/R c/R(LE) c/R(TE) .96 0.60 to 0.65% ?1.42 to ?1.34% .968 0.54 to 0.59% ?1.31 to ?1.34% .974 0.39 to 0.58% ?1.36 to ?1.22% .9806 0.13 to 0.57% ?1.45 to ?1.06% .9856 ?0.23 to 0.56%?? ?1.56 to ?0.74% .9906 ?0.76 to 0.55%?? ?1.74 to ?0.24% .9956 ?1.44 to 0.54%?? ?1.99 to 0.23%?? 1.00 ?2.17 to 0.54%?? ?2.27 to 0.44%?? where “r/R” is an approximate normalized distance outward from a center of rotation of the blade along a span of the blade; and “c/R(LE)” and “c/R(TE)” are approximate relative positions of a leading (LE) and trailing edge (TE) of a chord “c” expressed as a percentage of a distance outward from the center of rotation at each r/R.

Abstract: A blade for a wind turbine includes a total backward twist of between approximately 6 degrees and approximately 15 degrees between an outer approximately 1 percent to 10 percent of a rotor radius of the blade; and an approximate planform distribution within the following ranges r/R c/R(LE) c/R(TE) .96 0.60 to 0.65% ?1.42 to ?1.34% .968 0.54 to 0.59% ?1.31 to ?1.34% .974 0.39 to 0.58% ?1.36 to ?1.22% .9806 0.13 to 0.57% ?1.45 to ?1.06% .9856 ?0.23 to 0.56%?? ?1.56 to ?0.74% .9906 ?0.76 to 0.55%?? ?1.74 to ?0.24% .9956 ?1.44 to 0.54%?? ?1.99 to 0.23%?? 1.00 ?2.17 to 0.54%?? ?2.27 to 0.44%?? where “r/R” is an approximate normalized distance outward from a center of rotation of the blade along a span of the blade; and “c/R(LE)” and “c/R(TE)” are approximate relative positions of a leading (LE) and trailing edge (TE) of a chord “c” expressed as a percentage of a distance outward from the center of rotation at each r/R.

Abstract: A wind turbine blade for use in a wind energy system comprises a blade body having a trailing edge and a leading edge, and a plurality of bristles disposed on an outer surface of said blade body. The bristles are typically attached to said blade body in the vicinity of said trailing edge and serve to reduce noise caused by the airflow around the blade during operation.