Update support_of_simple_trajectory_calculations.md (#28)

Author: crolf

docs/develop/GSOC/support_of_simple_trajectory_calculations.md

@@ -12,14 +12,17 @@ The backend will offer the option to calculate trajectories from the waypoints o
 These will be visualized using as a kml overlay feature or a dedicated plugin. 
 This feature will greatly simplify the planning of self-match flights and allow better association between 
 the visualized maps showing the atmospheric state at certain times with the air actually sampled during the flight. 
+Another application of such trajectories is balloon flight planing i.e. calculation and visualization 
+of a balloon trajectory/flight path from a selected start location to its estimated landing position 
+with a given set of parameters like climbing rate and ceiling altitude.
 The MSS server usually has already the data necessary for performing the calculations, but a simple trajectory 
 module would need to be implemented/connected. Also, a WMS extension will need to be specified and implemented.
 
-- **Duration**: 175h - 350h
+- **Duration**: 350h
 - **Skills**: Python, QT, UI programming, Git
 - **Difficulty level**: Hard
 - **Related Readings/Links**:
     - https://www.msc-ep.uni-bremen.de/services/lectures/practicals/pr_trajectories_2019.pdf
     - https://predict.habhub.org/
 - **Potential mentors**:
-    [email protected], [email protected]
+    [email protected], [email protected]