How long is a windmill blade?

Answer 1

Windmills stay put. The tower does not move.

The blades rotate when wind blows. Most modern wind turbines are made to start producing electrical energy when the wind blows at 3 or 4 meters per second, they achieve maximum (rated) power production in winds around 8 meters per second and shut down when the winds reach 25 meters per second. The 50 meter long (100 m diameter) blades of a 2 MW turbine rotate at about 14 rpm when the wind is 8 m/s; the tips of the blades are then moving at about 75 m/s.

Answer 2

Despite masses of web pages that claim otherwise, and plenty of quizbooks as well, there are examples of windmills whose sails rotate clockwise, and examples that rotate anticlockwise. The direction is always taken from in front of the mill, and looking at the sails, the solid edge is the leading edge. An example of nearby similar mills whose sails rotate in opposite directions can be seen in Cambridgeshire at Bourn (anticlockwise) and Great Gransden (clockwise).

Answer 3

Depends how fast the wind is blowing.

The 50 meter long (100 m diameter) blades of a 2 MW turbine rotate at about 14 rpm when the wind is 8 m/s; the tips of the blades are then moving at about 75 m/s. When the wind blows harder, the blades will rotate somewhat faster (but not much!) up until the point where the turbine is shut down (usually around 25 m/s).

Answer 4

The tip speed of the windmill blades is typically 5 times the wind speed. That is, in a ten-mph wind, the tip of the blades moves at 50 mph.

Answer 5

a wind mill blade is about 1 and a half buses long

Answer 6

as big as 150 ft.

Answer 7

it depends on the weight of the blade.

Answer 8

4