NDLI: Yaw stability in gliding birds

Content Provider	Springer Nature Link
Author	Sachs, Gottfried
Copyright Year	2005
Abstract	A new concept for describing the yaw stability in gliding birds is presented. This concept introduces dynamic stiffness in yaw as an appropriate indication of stability. Other than the conventional metric of static yaw stability given by the gradient of the aerodynamic yawing moment with respect to the sideslip angle, the dynamic stiffness does not only provide a qualitative indication of stability but also a precise quantitative measure of the restoring action in the yaw axis. With the use of scaling relations, it is shown that the dynamic stiffness of birds is sufficiently high though their static yaw stability may be very small. The underlying mechanism is that the yaw moment of inertia is more reduced with a decrease in size than the restoring aerodynamic moment. Reference is made to the yaw stability in aircraft and related flying qualities requirements. Thus, numerical values are derived which can be used as a standard of comparison providing a rating basis for the dynamic yaw stiffness in small flying objects, like birds. Furthermore, it is shown that the wings of birds produce yawing moments due to sideslip so large that a sufficiently high level of dynamic yaw stiffness can be achieved. From the results derived in this paper, it may be concluded that birds—unlike aircraft—need no vertical tail for yaw stability.
Starting Page	191
Ending Page	199
Page Count	9
File Format	PDF
ISSN	00218375
Journal	Journal für Ornithologie
Volume Number	146
Issue Number	3
e-ISSN	14390361
Language	English
Publisher	Springer-Verlag
Publisher Date	2005-06-24
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Birds Gliding Stability Yaw
Content Type	Text
Resource Type	Article
Subject	Animal Science and Zoology

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