Download or read book A Method of Calculating a Stability Boundary that Defines a Region of Satisfactory Period-damping Relationship of the Oscillatory Mode of Motion written by Leonard Sternfield and published by . This book was released on 1949 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: A method has been derived by which a boundary can be obtained that defines a region in which there exists a satisfactory relationship between the period and damping of the lateral oscillatory mode of motion, according to any given criterion for this relationship. In addition, a method is discussed by which curves representing a constant rate of spiral divergence may be constructed. The methods presented are applicable as well to the analysis of longitudinal stability. A method for evaluating the roots of a quartic equation is also discussed.