Stoppflug

[net_sailor]

In my opinion "Stoppflug" method refers to the flight time measured between two gates (measure points) on specific distance. From dividing time/distance data the ground speed is given (horizontal speed of an aircraft relative to the ground). This is more simple and accurate method on low altitude (for example sea level flight), than reading speed directly from airspeed indicator on the plane's cockpit and making corrections due to various conditions (wind speed and direction, atmospheric pressure etc.).