flightEnvelopeType

A flight envelope is the range of altitude and speed in which the aircraft is operated. It is bounded by curves of characteristic speeds over altitude, such as the stall speed VS on the low-speed side and the maximum operating speed VMO on the high-speed side, each given as a <speed>. The altitudes refer to <atmosphericModel>, shifted by <deltaTemperature> (section 10 of cpacsType). The speeds are true airspeeds, so that the curves of a hot day differ from those of a standard day.

Flight envelope of a short-range airliner, altitude over true airspeed: the stall speed VS on the left rises from 66 m/s at sea level, the maximum operating speed VMO and the design diving speed VD on the right rise as constant calibrated airspeeds up to about 7.5 km and then follow a constant Mach number; the area between VS and VMO is shaded, and all curves end at the maximum operating altitude of 11.9 km; dots mark the points given in the example

The figure shows the flight envelope of a short-range airliner with the points of the example below. Up to about 7.5 km, VMO and the design diving speed VD are constant calibrated airspeeds, whose true airspeed grows with altitude; above, they are limited by a constant Mach number, the maximum operating Mach number for VMO and the design diving Mach number for VD. The curves named VMO and VD include these parts limited by a Mach number. The shaded area between the stall speed and the maximum operating speed is the normal operating range; all curves end at the maximum operating altitude.

<flightEnvelope>
    <atmosphericModel>ISA</atmosphericModel>
    <speed>
        <speedName>VS</speedName>
        <altitude>0;1000;2000;3000;4000;5000;6000;7000;8000;9000;10000;11000;11887</altitude>
        <trueAirSpeed>66;69.2;72.7;76.5;80.5;84.8;89.5;94.5;100;105.9;112.3;119.2;127.5</trueAirSpeed>
    </speed>
    <speed>
        <speedName>VMO</speedName>
        <altitude>0;1000;2000;3000;4000;5000;6000;7000;7489;8000;9000;10000;11000;11887</altitude>
        <trueAirSpeed>180;188.2;196.9;206.1;215.8;226.1;237;248.5;254.4;252.6;249.1;245.6;242;242</trueAirSpeed>
    </speed>
    <speed>
        <speedName>VD</speedName>
        <altitude>0;1000;2000;3000;4000;5000;6000;7000;7555;8000;9000;10000;11000;11887</altitude>
        <trueAirSpeed>196;204.8;214.1;223.9;234.2;245.2;256.7;268.8;275.8;274.2;270.4;266.5;262.6;262.6</trueAirSpeed>
    </speed>
</flightEnvelope>

Flight envelope of a short-range airliner

Attributes

Name	Type	Use	Description
`@externalDataDirectory`	`xsd:string`	optional	Directory of the external file the element was read from, as URI
`@externalDataNodePath`	`xsd:string`	optional	Path of the parent element in the merged dataset, at which the element was inserted from an external file
`@externalFileName`	`xsd:string`	optional	Name of the external file the element was read from

Child elements

Name	Type	Constraints	OccurrenceHow often the element may appear at this place. The schema writes it as minOccurs and maxOccurs on the declaration.	Description
sequenceThe children below must appear in exactly this order. Each may repeat as often as its own occurrence allows.
`atmosphericModel`	`atmosphericModelType`	1 value	[1..1] required	Atmospheric model the altitudes refer to
`deltaTemperature`	`doubleBaseType`		[0..1] optional	Temperature offset from the atmospheric model, see section 10 of the documentation of the root element [K]
`speed`	`flightEnvelopeSpeedType`		[1..∞] one or more	Boundary curve at one characteristic speed

flightEnvelopeType

Attributes

Child elements

Used by

In a dataset · 1 path

In the schema · 1 declaration