Aerodynamics behind Flying Wings and Tailless Aircraft (Part 2): Stability

Video Description

This is the second video in a series summarizing my notes for the design, analysis, fabrication, and testing of flying wing style aircraft from an engineer's approach. This video builds upon Part 1, so please go watch that video and understand its contents before watching this one. This video covers the derivation and explanation of each of the 18 important stability derivatives, and explains why this is important and not just meaningless math. Towards the end, there is a practical example of an aircraft analysis, investigating the stability derivatives before and after a minor design change. To wrap things up, I summarize several common methods to determine the stability characteristics of your aircraft design before your first flight test. Again, if you catch something that is incorrect here, please let me know! I filtered through the final cut as best as I could, but I'm here to learn, so I'm all ears! Incredible sources for stability: https://aircraftflightmechanics.com/NotesIntroduction.html https://courses.cit.cornell.edu/mae5070/DynamicEquations.pdf https://courses.cit.cornell.edu/mae5070/Caughey_2011_04.pdf Perkins, C. D., & Hage, R. E. (1966). Airplane Performance, Stability and Control. John Wiley & Sons. McCormick, B. W. (Year). Aerodynamics, Aeronautics, and Flight Mechanics. John Wiley & Sons. https://eaglepubs.erau.edu/introductiontoaerospaceflightvehicles/chapter/aircraft-stability-control/ https://www.micropilot.com/pdf/stability-derivatives.pdf https://mail.tku.edu.tw/095980/8_Stability%20and%20Control.pdf 0:00 Intro 0:39 Why should I watch this?? 02:40 Common Aero Definitions 03:43 Equations of motion 05:33 Forces + Moments 07:23 Common Stability Derivatives 07:51 Deriving the Stability Derivatives 11:53 Normal Force / Pitching Moment 13:23 Side Force / Rolling Moment 14:54 Yawing Moment 16:33 Derivatives: Speed 17:25 Derivatives: Pitching Moment 18:33 Derivatives: Rolling Moment 21:17 Derivatives: Yawing Moment 22:49 Derivatives: Side Force 24:30 Rules of Thumb 25:09 Design Analysis Exercise 29:49 Stability Analysis Methods