Advanced Descent

An Advanced Descent performance model is comprised of a set of parameters that define the flight characteristics of the aircraft while descending and is mapped to the physical properties of the aircraft that are currently defined in the Advanced Fixed Wing Tool.

Descent

Field	Description
Descent Airspeed	Select a mode to calculate the aircraft's airspeed while descending. Max Range Cruise Speed - a variable airspeed that maximizes the distance that the aircraft can fly. Best Glide Ratio The ratio of the distance that the aircraft travels forward to the distance that it travels downward. - the speed at which the aircraft's glide ratio is maximized. Min Sink Rate - the speed at which the aircraft's rate of descent is minimized. Stall Speed Ratio - a speed relative to the aircraft's stall speed. Override Airspeed - a specific, manually defined speed.
Stall Speed Ratio	The Stall Speed Ratio upon leaving the ground; this property is calculated if the Speed Mode is set to Angle of Attack The angle between the body X axis and the projection of the velocity vector onto the body XZ plane. The velocity vector is the velocity of the object as observed in the object's central body fixed coordinate system. or manually defined if it is set to Stall Speed Ratio.
Airspeed	The aircraft's airspeed; this property is calculated unless you have selected Override Airspeed for the Descent Airspeed property.
Speedbrakes	The extension of the speedbrakes during the landing.

Airspeed Limit Below Alt

Airspeed Limit Below Alt parameters are used to specify an airspeed limit when the aircraft is below a specified altitude. This limit represents a flight regulation (the default value is the limit proscribed by the FAA) and is not related to the actual performance capabilities of the aircraft.

Table - Airspeed Limit Below Alt

Field	Description
Use Airspeed Limit	Select the check box to apply an altitude airspeed limit on the aircraft.
Altitude Limit	The altitude threshold, below which the airspeed limit will be applied.
Airspeed	The aircraft's maximum airspeed when below the Altitude Limit; select a reference from the drop-down menu - true airspeed (TAS True Airspeed: the speed that the aircraft is moving relative to the airmass that it is flying in.), calibrated airspeed (CAS Calibrated Airspeed: the speed reported by the airspeed indicator, corrected for position and instrument error.), equivalent airspeed (EAS Equivalent Airspeed: the airspeed at sea level (International Standard Atmosphere) at which the dynamic pressure is equal to the dynamic pressure at the aircraft's current true airspeed and altitude.), or Mach The ratio of the aircraft's speed and the speed of sound at the aircraft's altitude, with local atmospheric conditions. number.

Compute Delta Altitude

The Compute Delta Altitude property defines the maximum change in altitude in a computed segment before the data is sampled again and a new segment is begun.