diff --git a/docs/documentation/sizing/create_mission_xml/mission_steps.md b/docs/documentation/sizing/create_mission_xml/mission_steps.md index 1a8d22e63fe9bbf1f7bdcd9a904c4e49962657fe..fa4722bee60f4604b0df73218e5fcf93a849eabb 100644 --- a/docs/documentation/sizing/create_mission_xml/mission_steps.md +++ b/docs/documentation/sizing/create_mission_xml/mission_steps.md @@ -24,7 +24,7 @@ The steps in the `mission_file` can be filled and arranged in different ways, de | accelerate | climb thrust setting | clean | N/A | 6.10 (1200 fpm) | CAS ATC limit climb | | climb | climb thrust setting | clean | 3048 (10,000 ft) | maximum rate of climb | N/A | -In the standard procedure, we assume that the thrust-to-weight ratio is high enough to maintain minimum safe climb speed $v_2$ (see [What a Mission Looks Like](index.md/#typical_mission)) from takeoff until en-route transition (`climb` configuration) at $3\,000\,ft$. Please mind, that EASA's CS-25 only allows extrapolation of the propulsion system's takeoff performance data up to that altitude. To do so, the aircraft shall climb with the given `maximum_rate_of_climb` and `climb_thrust_setting` from the [Configuration File](getting_started.md/#config_file) without an acceleration in between. Since the landing gear gets retracted between screen height ($35\,ft$) and $1\,500\,ft$, climbing up to $3\,000\,ft$ is divided into two segments. Like this, it's easier [Systems Design](../systems_design/index.md) to simulate the retraction and to put the power/bleed air demand into the `mission file`. Once en-route transition is reached, flaps are set to `climb` while accelerating to $210\,kt$ calibrated airspeed. Just after that, the aircraft accelerates further in `clean` configuration (least drag) until the _CAS_ATC_limit_climb_ is obtained. Since the air space below $10,000\,ft$ is more crowded, institutions like FAA and ICAO limit the speed to $250 kt$ calibrated airspeed, but you can change that in the `climb_speed_below_FL100` node of our [Aircraft Exchange File](getting_started.md/#acxml). Then, the aircraft finishes the departure procedure by climbing up to $10,000\,ft$ using the `maximum_rate_of_climb`. +In the standard procedure, we assume that the thrust-to-weight ratio is high enough to maintain minimum safe climb speed $v_2$ (see [What a Mission Looks Like](index.md/#typical_mission)) from takeoff until en-route transition (`climb` configuration) at $3\,000\,ft$. Please mind, that EASA's CS-25 only allows extrapolation of the propulsion system's takeoff performance data up to that altitude. To do so, the aircraft shall climb with the given `maximum_rate_of_climb` and `climb_thrust_setting` from the [Configuration File](getting_started.md/#config_file) without an acceleration in between. Since the landing gear gets retracted between screen height ($35\,ft$) and $1\,500\,ft$, climbing up to $3\,000\,ft$ is divided into two segments. Like this, it's easier for [Systems Design](../systems_design/index.md) to simulate the retraction and to put the power/bleed air demand into the `mission file`. Once en-route transition is reached, flaps are set to `climb` while accelerating to $210\,kt$ calibrated airspeed. Just after that, the aircraft accelerates further in `clean` configuration (least drag) until the _CAS_ATC_limit_climb_ is obtained. Since the air space below $10,000\,ft$ is more crowded, institutions like FAA and ICAO limit the speed to $250 kt$ calibrated airspeed, but you can change that in the `climb_speed_below_FL100` node of our [Aircraft Exchange File](getting_started.md/#acxml). Then, the aircraft finishes the departure procedure by climbing up to $10,000\,ft$ using the `maximum_rate_of_climb`. !!!node Although `maximum_rate_of_climb` can be set as a constant value, we usually set it to $-1$ to indicate that the aircraft shall use all possible thrust of its current engine settings to achieve altitude gains. Therefore, rate of climb varies within these climb segments. Since acceleration is most effective and saver when keeping a constant rate of climb, it is manually set to $1\,000\,\frac{ft}{min}$/$1\,200\,\frac{ft}{min}$ which follows the ICAO's recommendations.