Why Do Quadcopter Control Equations for Roll and Pitch Exclude Aerodynamic Drag?

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SUMMARY

The discussion centers on the control equations for quadcopters, specifically addressing why aerodynamic drag is excluded from roll and pitch equations while being considered in yaw equations. The participant references the book "Quad Rotorcraft Control: Vision-Based Hovering and Navigation" to clarify their confusion regarding the dynamics involved in these movements. Key points include the nature of thrust vectors and the differences in sign conventions for roll and pitch versus yaw. Understanding these distinctions is crucial for accurate quadcopter control.

PREREQUISITES
  • Understanding of quadcopter dynamics and control systems
  • Familiarity with the concepts of roll, pitch, and yaw in aerial vehicles
  • Knowledge of thrust vector mechanics
  • Basic principles of aerodynamic drag and its effects on flight
NEXT STEPS
  • Study the control equations presented in "Quad Rotorcraft Control: Vision-Based Hovering and Navigation"
  • Research the impact of aerodynamic drag on quadcopter stability and control
  • Explore the mathematical derivations of roll and pitch equations in quadcopter dynamics
  • Learn about thrust vector manipulation and its role in quadcopter maneuverability
USEFUL FOR

Aerospace engineers, quadcopter enthusiasts, and researchers in unmanned aerial vehicle (UAV) dynamics will benefit from this discussion, particularly those focusing on control systems and flight mechanics.

Benyoucef Rayane
Hey, everyone, I have a question regarding quadcopters, when the set of the arms is of configuration X, to roll we increase the velocity of the two motors on the left/right and decrease the other motors on right/left, the question is when doing so the total angular velocity is zero that means the moment of each thrust generated will be canceled out, this whole thing is confusing, I know I 'm wrong somewhere, Please any explication!
 
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Benyoucef Rayane said:
this whole thing is confusing
So is your post. Try separate sentences, precise description of the different situations and a clear question.
 
sorry, there is a typo, it is not the rolling movement actually it is yawing, so my questions are: considering the figure taken from the book " Quad Rotorcraft Control. Vision-Based Hovering and Navigation", you can find it in this link https://www.researchgate.net/publication/278745381_Quad_Rotorcraft_Control_Vision-Based_Hovering_and_Navigation
1. why the roll and pitch equations, unlike yaw equation, don't take into account the aerodynamic drag
2.since the thrust is always up and the vector from the center of mass to the applied force (Thrust) is the same whether in pitch or roll rotation, so why the negative and positive signs are different in pitch and roll equations
Capture.PNG
 

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