Passive venting technique for shallow cavities

A device is introduced for reducing drag and store separation difficulties caused by shallow cavities on aircraft in supersonic flight consisting of a group of hollow pipes the same length as the cavity. The pipes are attached to the cavity floor so as to allow air to flow through the pipes. This device allows air to flow through the pipes opposite to the direction of flow outside the pipes. This results in reduced drag and improved store separation characteristics

High impact pressure regulator Patent

High impact pressure regulator having minimum number of lightweight movable element

Experimental cavity pressure distributions at supersonic speeds

An investigation was conducted to define pressure distributions for rectangular cavities over a range of free-stream Mach numbers and cavity dimensions. These pressure distributions together with schlieren photographs are used to define the critical values of cavity length-to-depth ratio that separate open type cavity flows from closed type cavity flows. For closed type cavity flow, the shear layer expands over the cavity leading edge and impinges on the cavity floor, whereas for open type cavity flow, the shear layer bridges the cavity. The tests were conducted by using a flat-plate model permitting the cavity length to be remotely varied from 0.5 to 12 in. Cavity depths and widths were varied from 0.5 to 2.5 in. The flat-plate boundary layer approaching the cavity was turbulent and had a thickness of approximately 0.2 in. at the cavity front face for the range of test Mach numbers from 1.5 to 2.86. Presented are a discussion of the results and a complete tabulation of the experimental data

Climatological Assessment of Urban Effects on Precipitation: Final Report Part I

published or submitted for publicationis peer reviewedOpe

High impact pressure regulator withstands impacts of over 15,000 g

High impact pressure regulator used with a high impact gas scannograph withstands impacts of over 15,000 g. By the passage of fluid through the first and second chambers of the regulator, the pressure of the scannograph is regulated from a specific input valve to the desired output pressure valve

A Study of the Relationship of Socio-Economic Status to School Achievement and Intelligence

It was the purpose of this study (1) to examine the relationship between socioeconomic status and intelligence, of eighth grade students in the same school system, and their achievement in certain school subjects; (2) to show the relationship of a selected instrument for the measurement of socioeconomic status to school achievement and intelligence; and (3) to present the significance of these findings and their application in a school situation

The Evolution of Soviet Thought on Warfare in the Fourth Dimension

A number of authors lately have expressed proper concern about thereadiness of the US Navy to conduct warfare in a dimension other than the three conventional media: sea, air, and land.\u27 This additional dimension, the electromagnetic spectrum, is as vital a battlefield in wartime as any of the other three, perhaps even more so. While Americans have consistently been in the forefront of the technical development of electronic warfare (EW) equipment, we have not, at the same time, been quick to exploit its operational utility across the entire spectrum of warfare

The Evolution of Soviet Views on Fleet Air Defense

The Soviet Navy is constantly changing, evolving from a coastal he Soviet Navy is constantly changing, evolving from a coastal. defense force to a blue water fleet able to show the red flag in the far reaches of the globe. This evolution is evident in Soviet shipbuilding programs and peacetime operations. But nowhere is it more evident than in Soviet naval literature. This literature, more than any other indicator, reflects the attitudes and concerns of high-ranking Soviet naval officers