Latest content added for UNT Digital Library Partner: UNT Libraries Government Documents Departmenthttp://digital.library.unt.edu/explore/partners/UNTGD/browse/?start=10&fq=untl_collection:NACA&fq=str_title_serial:NACA+Technical+Memorandums2014-03-22T10:27:53-05:00UNT LibrariesThis is a custom feed for browsing UNT Digital Library Partner: UNT Libraries Government Documents DepartmentLoad assumptions for calculating the strength of airplanes2014-03-22T10:27:53-05:00http://digital.library.unt.edu/ark:/67531/metadc277476/<p><a href="http://digital.library.unt.edu/ark:/67531/metadc277476/"><img alt="Load assumptions for calculating the strength of airplanes" title="Load assumptions for calculating the strength of airplanes" src="http://digital.library.unt.edu/ark:/67531/metadc277476/small/"/></a></p><p>The following load assumptions shall be taken as the basis of the strength calculations. Certain definite load conditions (e.g. of flight, control, landing and transport) shall be assumed. The loads shall be assumed to be safe loads, constant or only slowly variable, and the inertia forces due to elastic deformation are accordingly disregarded. The external forces, the force of gravity and the inertia forces on the whole airplane shall produce a condition of equilibrium.</p>Replacing the weight of materials consumed on airships2014-03-22T10:27:53-05:00http://digital.library.unt.edu/ark:/67531/metadc277431/<p><a href="http://digital.library.unt.edu/ark:/67531/metadc277431/"><img alt="Replacing the weight of materials consumed on airships" title="Replacing the weight of materials consumed on airships" src="http://digital.library.unt.edu/ark:/67531/metadc277431/small/"/></a></p><p>Two methods to replace the weight of gas lost on long airship flights are discussed: condensing the water of combustion and thermic sustentation. In the present article we will discuss the first method, leaving the second to be examined in a subsequent article.</p>Eleventh Rhon soaring-flight contest, 19302014-03-22T10:27:53-05:00http://digital.library.unt.edu/ark:/67531/metadc277421/<p><a href="http://digital.library.unt.edu/ark:/67531/metadc277421/"><img alt="Eleventh Rhon soaring-flight contest, 1930" title="Eleventh Rhon soaring-flight contest, 1930" src="http://digital.library.unt.edu/ark:/67531/metadc277421/small/"/></a></p><p>This report presents the results and a recounting of the new technological developments that were developed for the 11th Rhon Soaring Contest.</p>Development of tailless and all-wing gliders and airplanes2014-03-22T10:27:53-05:00http://digital.library.unt.edu/ark:/67531/metadc277449/<p><a href="http://digital.library.unt.edu/ark:/67531/metadc277449/"><img alt="Development of tailless and all-wing gliders and airplanes" title="Development of tailless and all-wing gliders and airplanes" src="http://digital.library.unt.edu/ark:/67531/metadc277449/small/"/></a></p><p>Tailless airplanes are characterized by having all their control surfaces, especially the elevator, incorporated in the wings. This paper provides a discussion of the history of their development and current state of development.</p>Building a full-size glider2014-03-22T10:27:53-05:00http://digital.library.unt.edu/ark:/67531/metadc277419/<p><a href="http://digital.library.unt.edu/ark:/67531/metadc277419/"><img alt="Building a full-size glider" title="Building a full-size glider" src="http://digital.library.unt.edu/ark:/67531/metadc277419/small/"/></a></p><p>The building and flying of a glider is possible for anyone who can use a few basic tools. This report presents some plans and techniques for building your own glider.</p>The vector ruling protractor2014-03-22T10:27:53-05:00http://digital.library.unt.edu/ark:/67531/metadc277482/<p><a href="http://digital.library.unt.edu/ark:/67531/metadc277482/"><img alt="The vector ruling protractor" title="The vector ruling protractor" src="http://digital.library.unt.edu/ark:/67531/metadc277482/small/"/></a></p><p>The theory, structure and working of a vector slide rule is presented in this report. This instrument is used for determining a vector in magnitude and position when given its components and its moment about a point in their plane.</p>Unsymmetrical forces in an airplane cell2014-03-22T10:27:53-05:00http://digital.library.unt.edu/ark:/67531/metadc277443/<p><a href="http://digital.library.unt.edu/ark:/67531/metadc277443/"><img alt="Unsymmetrical forces in an airplane cell" title="Unsymmetrical forces in an airplane cell" src="http://digital.library.unt.edu/ark:/67531/metadc277443/small/"/></a></p><p>This paper calls attention to the desirability of expanding airplane building regulations to include proof of safety for cases of unsymmetrical loading, at least in the structural members which are thereby specially stressed.</p>Effects of streamline curvature on lift of biplanes2014-03-22T10:27:53-05:00http://digital.library.unt.edu/ark:/67531/metadc277459/<p><a href="http://digital.library.unt.edu/ark:/67531/metadc277459/"><img alt="Effects of streamline curvature on lift of biplanes" title="Effects of streamline curvature on lift of biplanes" src="http://digital.library.unt.edu/ark:/67531/metadc277459/small/"/></a></p><p>This report concerns, first, the determination of the lift of a wing which is situated in a curvilinear flow; and second, to calculate the curvature which one wing of a biplane produces in the vicinity of the other.</p>Ultra-light alloys and their utilization on aircraft2014-03-22T10:27:53-05:00http://digital.library.unt.edu/ark:/67531/metadc277440/<p><a href="http://digital.library.unt.edu/ark:/67531/metadc277440/"><img alt="Ultra-light alloys and their utilization on aircraft" title="Ultra-light alloys and their utilization on aircraft" src="http://digital.library.unt.edu/ark:/67531/metadc277440/small/"/></a></p><p>We will arbitrarily call alloys having a specific gravity of less than 2 "ultra-light", in order to distinguish them from "light" alloys with a specific gravity of 2 to 3. Thus far it has been possible to make ultra-light alloys only by employing a large proportion of magnesium.</p>A study of curvilinear flight2014-03-22T10:27:53-05:00http://digital.library.unt.edu/ark:/67531/metadc277406/<p><a href="http://digital.library.unt.edu/ark:/67531/metadc277406/"><img alt="A study of curvilinear flight" title="A study of curvilinear flight" src="http://digital.library.unt.edu/ark:/67531/metadc277406/small/"/></a></p><p>When an airplane describes a curve it takes a certain time for it to turn from level to inclined position and then back to level again. In the following, we express the motion about the horizontal axis as "roll" or "bank" and the motion perpendicular to the vertical axis, i.e., the actual curve, as "turn." Equations and tables provide results on various aspects of turns, control settings, acceleration, inertia moments, and angular velocity.</p>