Advanced Cruise

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

The Basic Point to Point procedure ignores the Max Perf fuel flow when constructing its profile. For more information, see the Basic Point to Point help page.

Cruise

Field Description
Default Cruise Altitude

The aircraft's default cruising altitude. You cannot specify an altitude below sea level (0). If a procedure is specified that requires the aircraft to fly below sea level, the performance models in effect at sea level will be applied to that procedure.
Max Perf Airspeed

Select a method for defining the maximum performance airspeed of the aircraft with respect to its altitude. The powerplant strategy that was selected for the aircraft when the performance model was created from the Advanced Fixed Wing Tool

  • Corner Speed - the lowest speed at which the aircraft can generate lift while pulling maximum Gs (i.e., the tightest turn speed).
  • Max Ps - the maximum specific excess power.
  • Max Ps (Dry Thrust) - the maximum specific excess power without afterburning.
  • Max Ps (Afterburning) - the maximum specific excess power while afterburning.
  • Max Speed (Dry Thrust) - the maximum speed without afterburning.
  • Max Range (Afterburning) - a variable airspeed that maximizes the distance that the aircraft can fly while afterburning.

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 AltClosed

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 Downrange

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