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The effectiveness of a trailing disk, or trapped vortex concept, in reducing the base drag of a large body of revolution was studied from measurements made both in flight and in a wind tunnel. Pressure data obtained for the flight experiment, and both pressure and force balance data were obtained for the wind tunnel experiment. The flight test also included data obtained from a hemispherical base. The experiment demonstrated the significant base drag reduction capability of the trailing disk to Mach 0.93 and to Reynolds numbers up to 80 times greater than for earlier studies. For the trailing disk data from the flight experiment, the maximum decrease in base drag ranged form 0.08 to 0.07 as Mach number increased from 0.70 to 0.93. Aircraft angles of attack ranged from 3.9 to 6.6 deg for the flight data. For the trailing disk data from the wind tunnel experiment, the maximum decrease in base and total drag ranged from 0.08 to 0.05 for the approximately 0 deg angle of attack data as Mach number increased from 0.30 to 0.82.

1Practical Guide to Self-Hypnosis

By Melvin Powers

Summary from <em>A Practical Guide to Self-Hypnosis</em>: This book is written in terms that are comprehensible to the layman. The step-by-step instructions should afford the reader a means of acquiring self-hypnosis. The necessary material is here. The reader need only follow the instructions as they are given. It is the author's hope that you will, through the selective use of self-hypnosis, arrive at a more rewarding, well-adjusted, and fuller life.

2Stories the Iroquois Tell Their Children

By Mabel Powers

Stories the Iroquois Tell Their Children by Mabel Powers is a beautiful collection of traditional Iroquois tales that not only entertain but also teach fundamental cultural values and life lessons. These stories, passed down through generations by elders around the fire, serve to educate children on themes such as bravery, kindness, respect for nature, and the importance of community. The book’s tales feature a range of characters including the Little People, animals, and children. Each story is rich with symbolic meaning. Powers also touches on the role of nature in these stories, reflecting the Iroquois' deep reverence for the natural world and its creatures, while exploring concepts like gratitude, generosity, and cooperation. By weaving together these ancient tales with lessons about life, the book offers not only a glimpse into Iroquois culture but also timeless wisdom that transcends generations. - Summary by Anthony Karl Futterer