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There are a total of 1031821 record(s) matching your query.
Sorted by: Date Added To NTRS in Descending order
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The proper combination of lift loadings for least drag on a supersonic wing
Author(s): Grant, Frederick C
Abstract: Lagrange's method of undetermined multipliers is applied to the problem of properly combining lift loadings for the least drag at a given lift on supersonic wings. The method shows the interference drag between the optimum ...
NASA Center: Langley Research Center
Publication Year: 1956
Added to NTRS: 2009-01-14
Accession Number: 93R21563; Document ID: 19930092273; Report Number: NACA-TR-1275
Studies of the speed stability of a tandem helicopter in forward flight
Author(s): Tapscott, Robert J; Amer, Kenneth B
Abstract: Flight-test measurements, related analytical studies, and corresponding pilots' opinions of the speed stability of tandem-rotor helicopter are presented. An undesirable instability, evidenced by rearward stick motion with ...
NASA Center: Langley Research Center
Publication Year: 1956
Added to NTRS: 2009-01-14
Accession Number: 93R21551; Document ID: 19930092261; Report Number: NACA-TR-1260
Validation of Procedures for Monitoring Crewmember Immune Function
Author(s): Crucian, Brian; Stowe, Raymond; Mehta, Satish; Uchakin, Peter; Quiriarte, Heather; Pierson, Duane; Sams, Clarence
Abstract: There is ample evidence to suggest that space flight leads to immune system dysregulation, however the nature of the phenomenon as it equilibrates over longer flights has not been determined. This dysregulation may be a ...
NASA Center: Johnson Space Center
Publication Year: 2009
Added to NTRS: 2009-01-14
Document ID: 20090001235
Near noise field of a jet-engine exhaust
Author(s): Howes, Walton L; Callaghan, Edmund E; Coles, Willard D; Mull, Harold R
Abstract: Aircraft structures located in the near noise field of a jet engine are subjected to extremely high fluctuating pressures that may cause structural fatigue. Studies of such structures have been limited by lack of knowledge ...
NASA Center: Langley Research Center
Publication Year: 1957
Added to NTRS: 2009-01-14
Accession Number: 93R21617; Document ID: 19930092327; Report Number: NACA-TR-1338
Summary of airfoil data
Author(s): Abbott, Ira H; Von Doenhoff, Albert E; Stivers, Louis, Jr
Abstract: The historical development of NACA airfoils is briefly reviewed. New data are presented that permit the rapid calculation of the approximate pressure distributions for the older NACA four-digit and five-digit airfoils by the ...
NASA Center: Langley Research Center
Publication Year: 1945
Added to NTRS: 2009-01-14
Accession Number: 93R20266; Document ID: 19930090976; Report Number: NACA-TR-824
Seat design for crash worthiness
Author(s): Pinkel, I Irving; Rosenberg, Edmund G
Abstract: A study of many crash deceleration records suggested a simplified model of a crash deceleration pulse, which incorporates the essential properties of the pulse. The model pulse is considered to be composed of a base pulse on ...
NASA Center: Glenn Research Center
Publication Year: 1957
Added to NTRS: 2009-01-14
Accession Number: 93R21611; Document ID: 19930092321; Report Number: NACA-TR-1332
Average properties of compressible laminar boundary layer on flat plate with unsteady flight velocity
Author(s): Moore, Franklin K; Ostrach, Simon
Abstract: The time-average characteristics of boundary layers over a flat plate in nearly quasi-steady flow are determined. The plate may be either insulated or isothermal. The time averages are found without specifying the plate ...
NASA Center: Glenn Research Center
Publication Year: 1957
Added to NTRS: 2009-01-14
Accession Number: 93R21605; Document ID: 19930092315; Report Number: NACA-TR-1325
Thin oblique airfoils at supersonic speed
Author(s): Jone, Robert T
Abstract: The well-known methods of thin-airfoil theory have been extended to oblique or sweptback airfoils of finite aspect ratio moving at supersonic speeds. The cases considered thus far are symmetrical airfoils at zero lift having ...
NASA Center: Langley Research Center
Publication Year: 1946
Added to NTRS: 2009-01-14
Accession Number: 93R20385; Document ID: 19930091095; Report Number: NACA-TR-851
Buckling of thin-walled cylinder under axial compression and internal pressure
Author(s): Lo, Hsu; Crate, Harold; Schwartz, Edward B
Abstract: An investigation was made of a thin-walled cylinder under axial compression and various internal pressures to study the effect of the internal pressure on the compressive buckling stress of the cylinder. A theoretical ...
NASA Center: Langley Research Center
Publication Year: 1951
Added to NTRS: 2009-01-14
Accession Number: 93R20245; Document ID: 19930090955; Report Number: NACA-TR-1027
Charts for estimating tail-rotor contribution to helicopter directional stability and control in low-speed flight
Author(s): Amer, Kenneth B; Gessow, Alfred
Abstract: Theoretically derived charts and equations are presented by which tail-rotor design studies of directional trim and control response at low forward speed can be conveniently made. The charts can also be used to obtain the ...
NASA Center: Langley Research Center
Publication Year: 1955
Added to NTRS: 2009-01-14
Accession Number: 93R21516; Document ID: 19930092226; Report Number: NACA-TR-1216
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