Apparent wind

True wind

As the true wind direction and wind speed of the meteorological wind is referred to in the seafaring, as measured for example on a moored ship.

Wind

The wind is represented by the movement of a vehicle (drive ) caused " headwind ". He always comes exactly from the front, then, is the direction of motion of the vehicle ( 180 ° ) in opposite directions. This case is easy to observe each other with no wind, then wind and apparent wind exactly superimposed are vectors.

Apparent Wind

The apparent wind (also called relative wind or wind board ) is in the shipping industry and in particular sailing of importance. It is perceived on a moving ship wind which results from the vectorial addition of the true wind and the wind rushing by.

Vehicles with sail drive always use the apparent wind. In a sailing vessel, the position of the sail is also directed by the apparent wind.

But on the bike, the apparent wind can be experienced. If you drive in the direction in which the wind blows and it is just as fast as the wind blows, then is the air "apparently", although the wind blow through the trees looks ( wind and true wind are vectorially opposite each other and neutralize itself ).