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The effectiveness of a trailing disk (the trapped vortex concept) in reducing the blunt base drag of an 8-in diameter body of revolution was studied from measurements made both in flight and in full-scale wind-tunnel tests. The experiment demonstrated the significant base drag reduction capability of the trailing disk to Mach 0.93. The maximum base drag reduction obtained from a cavity tested on the flight body of revolution was not significant. The effectiveness of a splitter plate and a vented-wall cavity in reducing the base drag of a quasi-two-dimensional fuselage closure was studied from base pressure measurements made in flight. The fuselage closure was between the two engines of the F-111 airplane; therefore, the base pressures were in the presence of jet engine exhaust. For Mach numbers from 1.10 to 1.51, significant base drag reduction was provided by the vented-wall cavity configuration. The splitter plate was not considered effective in reducing base drag at any Mach number tested.

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