Wing Span

A gorgeously illustrated and interactive full-color guide to more than 181 birds of North America, based on the bestselling board game, Wingspan. Praised for its gorgeous illustrations, accurate portrayal of bird habitats, and its gameplay, the bird-focused board game Wingspan has become an international sensation, available in a dozen languages and selling more than 200,000 copies its first year. Celebrating Birds is the ultimate companion to the game for fans, as well as a beautiful and in-depth field guide for avian and nature enthusiasts. In addition to large-size representations of each bird and the most up-to-date bird descriptions provided by Cornell Lab of Ornithology, Celebrating Birds includes a step-by-step guide that can be used to take the game into the real world. Players can collect points based on the birds, nests, and various habitat and feeding clues they find outside. Artists and best friends Natalia Rojas and Ana Maria Martinez collaborated to create the beautiful depictions featured in the original Wingspan board game. Celebrating Birds features larger illustrations of the 170 North American birds from the game, plus eleven exciting new birds. With Celebrating Birds, players and amateur naturalists can discover details about many of the birds currently at risk for extinction. As the number of birds in the United States and Canada has declined precipitously, Celebrating Birds is a fun way to raise awareness, educate, encourage activism, and provide resources on some of the most important ecological issues facing us today.

"The basic aerodynamic relations needed for the design of wings with cambered span having a minimum induced drag at specified flight conditions are developed for wings of arbitrary spanwise camber. Procedures are also developed for determining the physical wing form required to obtain the maximum value of lift-drag ratio at cruise, when the wing spanwise camber-line and section profiles are specified, by optimizing the wing chord and twist distributions with respect to both profile and induced drags. The application of the design procedure is illustrated by determining the physical wing form for a circular-arc spanwise camber line. The efficiency of this cambered wing is compared with that of an equal-span, flat wing of elliptical planform which satisfies the same set of fright operating conditions as does the cambered wing. The wing pitching- moment equations for optimally loaded cambered-span wings at design flight conditions are also developed for use in trim analyses on complete aircraft designs."--Page 1.

A method of computing span loads and the resulting rolling moments for sideslipping wings of arbitrary plan form in incompressible flow is derived. The method requires that the span load at zero sideslip be known for the wing under consideration. Because this information is available for a variety of wings, this requirement should not seriously restrict the application of the present method. The basic method derived herein requires a mechanical differentiation and integration to obtain the rolling moment for the general wing in sideslip. For wings having straight leading and trailing edges over each semispan, the rolling moment equation in terms of plan-form parameters and the lateral center of pressure of the lift due to angle of attack. Calculated span loads and rolling-moment parameters are compared with experimental values. The comparison indicates good agreement between calculations and available experimental data.

A simplified lifting-surface theory that includes effects of compressibility and spanwise variation of section lift-curve slope is used to provide charts with which antisymmetric loading due to arbitrary antisymmetric angle of attack can be found for wings having symmetric plan forms with a constant spanwise sweep angle of the quarter-chord line. Consideration is given to the flexible wing in roll. Aerodynamic characteristics due to rolling, deflected ailerons, and sideslip of wings with dihedral are considered. Solutions are presented for straight-tapered wings for a range of swept plan forms.

In the past fifty years, scholars of human development have been moving from studying change in humans within sharply defined periods, to seeing many more of these phenomenon as more profitably studied over time and in relation to other processes. The Handbook of Life-Span Development, Volume 2: Social and Emotional Development presents the study of human development conducted by the best scholars in the 21st century. Social workers, counselors and public health workers will receive coverage of the social and emotional aspects of human change across the lifespan.

Pterosaurs were a peculiar group of Mesozoic vertebrates, which acquired the ability to fly in an original way, using a membrane attached to a single finger of the hand. Ever since the first description of a pterosaur skeleton in 1784, these remarkable animals have elicited much discussion and controversy among palaeontologists, and many basic questions about their origin, evolution and biology remain disputed. In the last few years, interest in pterosaurs has been revived by numerous discoveries of new and sometimes remarkably preserved specimens, which have enlarged and changed our picture of this group. The volume begins with descriptions of several new pterosaurs from the Triassic, Jurassic and Cretaceous of Europe, North and South America, and Africa. Following this, alternative hypotheses of pterosaur phytogeny and evolution are put forward. Several papers discuss the functional anatomy of pterosaurs and its implications for aerial locomotion. The study of pterosaur footprints provides important new evidence concerning their terrestrial locomotion, and this approach is used in several contributions. A developing aspect of pterosaur research is bone histology, as shown by the final papers in this collection.