Sliding angle
As a sideslip angle (engl. Sideslip angle, crab angle ) refers to the drift angle between the longitudinal axis of an aircraft and the direction of inflow (relative wind). The sliding angle is of aerodynamic interest:
- With no wind and normal flight it is zero.
- If it is different from zero, the flow towards the wings is asymmetrical. The greater the sliding angle, the greater the resistance , since the flow is flowing against the fuselage , and the smaller the lift , since the flow is inclined against the wings and z. T. lie in the slipstream of the trunk. During normal flight, therefore, the aim is to achieve the smallest possible slip angle.
The gliding of the slide angle by means of a thread to be checked which one side adhered to the hood and is directed by the air flow.
The sideslip is an attitude in which the sideslip intentionally increased is. It is a way to increase the glide angle when landing if no other deceleration aids such as. B. Brake flaps are available or not sufficient. In a cross wind landing (engl. Crosswind landing ), a slight sideslip can avoid misalignment and: the aircraft is easily flows laterally from the wind, but the longitudinal axis and the direction of flight being parallel to the runway.
Not to be confused with this is the windward or lead angle . It indicates how far an aircraft has to be turned off course in a cross wind in order to maintain course .