A comparison of Wortmann airfoil computer-generated lift and drag polars with flight and wind tunnel results

Computations of drag polars for a low-speed Wortmann sailplane airfoil are compared with both wind tunnel and flight test results. Excellent correlation was shown to exist between computations and flight results except when separated flow regimes were encountered. Smoothness of the input coordinates to the PROFILE computer program was found to be essential to obtain accurate comparisons of drag polars or transition location to either the flight or wind tunnel flight results

A comparison of computer-generated lift and drag polars for a Wortmann airfoil to flight and wind tunnel results

Computations of drag polars for a low-speed Wortmann sailplane airfoil are compared to both wind tunnel and flight results. Excellent correlation is shown to exist between computations and flight results except when separated flow regimes were encountered. Wind tunnel transition locations are shown to agree with computed predictions. Smoothness of the input coordinates to the PROFILE airfoil analysis computer program was found to be essential to obtain accurate comparisons of drag polars or transition location to either the flight or wind tunnel results

Ground-effect analysis of a jet transport airplane

An analysis of the ground effect of a jet transport airplane has been made. Data were obtained from recent flight tests primarily using the constant angle-of-attack approach technique. Reasonable results were obtained for ground-effect pitching moment and lift increments. These were compared with data from other sources, including computations, wind tunnel, and previous flight test. A recommended ground-effect model was developed from the results. A brief simulator study was conducted to determine the sensitivity of a particular configuration to this ground-effect model and its associated uncertainty

Estimating radial curvature in fragmentary hominin fossils : a comparative study in apes and humans [abstract]

Forearm bone curvature has been invoked in interpretation of fossil hominin behavior. Apes have curved radii, reflecting hypertrophied forearm musculature needed for below-branch arboreal locomotion and increased leverage for pronation and flexion of the hand. As bipeds, humans have straighter radii adapted to manipulatory rather than locomotor activities. When this evolutionary transition took place, however, is poorly understood. Several radii are known from fossil hominins but they are all incomplete. If curvature could be estimated from fragmentary fossils, it would be possible to evaluate the evolution of forearm curvature in hominins. This study tests the hypothesis that bone curvature could be estimated from proximal radii fragments

Rethinking Social Justice Issues Within an Eco-Justice Conceptual and Moral Framework

As the social justice issues of class, race, and gender have been the dominant concern of many educational studies faculty over the last decades, it is now time to ask whether the recent evidence of global warming, changes in the chemistry of the world’s oceans, and the increasing shortage of potable water should lead to developing a new strategy for ameliorating these longstanding sources of injustice and poverty. Given the amount of time devoted to discussing class, race, and gender issues, as well as the number of books that focus on these issues, little has actually been achieved in effecting the systemic changes required for marginalized social groups to participate on more equal terms in the public arenas of politics, economics, and educational opportunities. Corporations in the United States continue to shape governmental policies that deepen the economic plight of marginalized groups who live at the bottom of the wage scale, while raising the cost of drugs and medical care beyond what they can afford. Overall, the democratic process itself has become degraded by corporate and other special interests to the point where millions of people continue to be mired in poverty and hopelessness

Observing and engaging new ways to reduce self harm and suicide

It’s been a long haul, but the City-128 research report on the use of special observation to reduce self-harm on acute psychiatric wards was finally released in May, more than two years after we first started collecting data, and eight years after the idea was conceived back in 1999. The study was called City-128 because our plan was to recruit 128 wards – however we managed to exceed this and collect even more information