rc_cessna: increase drag and reduce motor torque

[StefanoColli]

Improved rc_cessna model simulation behaviour:

• increased wings drag for faster deceleration when there is no throttle
• increased vertical stabilizer area for a more realistic air resistance during banking manouvers
• decreased motor power to reduce the plane top speed at full throttle (from over 100m/s to a more reasonable 40-50m/s)

[Jaeyoung-Lim]

@StefanoColli Can you share flight logs that compares the previous and fixed behavior for reference?

[StefanoColli]

Do you mean some graphs showing the different behavior (e.g., for the speed at max throttle and deceleration at 0 throttle) or complete ulg logs? Because the latter also depends on the tuning on PX4 side and not only on the Gazebo models.

[Jaeyoung-Lim]

@StefanoColli Both. The description of the PR only discusses changes in the code without explaining the effects on the behavior of the model