From 36620cfce8d3c6716614b554bb21429fed8ceca7 Mon Sep 17 00:00:00 2001
From: Kristina Mazur <kristina.mazur@tum.de>
Date: Thu, 23 Jan 2025 10:26:01 +0100
Subject: [PATCH] Includes description about delta_ISA as TLAR

---
 docs/assets/images/tutorials/ISA.svg          | 1649 +++++++++++++++++
 .../changing-design-specifications.md         |   23 +
 2 files changed, 1672 insertions(+)
 create mode 100644 docs/assets/images/tutorials/ISA.svg

diff --git a/docs/assets/images/tutorials/ISA.svg b/docs/assets/images/tutorials/ISA.svg
new file mode 100644
index 0000000..85484dc
--- /dev/null
+++ b/docs/assets/images/tutorials/ISA.svg
@@ -0,0 +1,1649 @@
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diff --git a/docs/tutorials/changing-design-specifications.md b/docs/tutorials/changing-design-specifications.md
index d9e459f..8098733 100644
--- a/docs/tutorials/changing-design-specifications.md
+++ b/docs/tutorials/changing-design-specifications.md
@@ -67,3 +67,26 @@ Definition of constraints:
 
 Note that the parameters displayed here are relevant to the sizing of the entire aircraft. For module-specific adjustments, the relevant parameters can be found in the configuration file of the corresponding module. For instance, to modify the wing sweep angle, the parameter can be located in the wing_design configuration file under `program_settings/tube_and_wing/cantilever/calculation_methods/sweep`. For further details, consult the documentation of the corresponding module.
 
+## Good to know
+
+Some parameter require more explaination - this section provides the background.
+
+### delta_ISA
+
+As we learned in school, the Earth's atmosphere is not static. Different parameter like air density, pressure, and composition change depending on altitude, latitude, longitude, time of year and day. As an aircraft has to be designed for different routes and missions, but considering detailed atmospheric data would not be feasible, the **ISA** (International Standard Atmosphere) is used as a common reference. This model represents the Earth's atmosphere over altitude and was defined in thr 1920s primarly as pressure alitmeter calibration and later on published in 1975 as ISO2533<sup>[1]</sup>.
+
+Following assumptions are considered:
+
+- Mean sea level conditions of 288.25 K (15°C), 1013.25 hPa pressure, and 1.225 kg/m³ air density, 340.294 m/s speed of sound, 9.81 m/s<sup>2</sup> aacceleration of gravity.
+- A constant lapse rate of -6.5°C/km in the troposphere up to 11 km.
+- Isothermal or different lapse rates for layers above the troposphere.
+
+`delta_ISA` is therefore a mission related parameters which changes the starting point of ISA - commonly adapted over the temperature. The figure shows it examplary for ISA+10.
+
+<figure markdown>
+  ![ISA](../assets/images/tutorials/ISA.svg){width="500"}
+  <figcaption>Altitude over temperature for ISA and ISA+10</figcaption>
+</figure>
+
+---
+<sup>[1]</sup> International Organization for Standardization, Standard Atmosphere, ISO 2533:1975, 1975.<br>
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