A. Seiff
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View article: A Wind Tunnel Study on the Mars Pathfinder (Mpf) Lander Descent Pressure Sensor
A Wind Tunnel Study on the Mars Pathfinder (Mpf) Lander Descent Pressure Sensor Open
The primary focus of this study was to determine the accuracy of the Mars Pathfinder lander local pressure readings in accordance with the actual ambient atmospheric pressures of Mars during parachute descent. In order to obtain good measu…
View article: Mass spectrometry in the exploration of Mars
Mass spectrometry in the exploration of Mars Open
In 1976, coincident with the 200th anniversary of the founding of the United States of America, the Viking 1 spacecraft arrived to explore the atmosphere and surface of Mars. Two mass spectrometers were on board, the results of the efforts…
View article: Results of the Mars Pathfinder atmospheric structure investigation
Results of the Mars Pathfinder atmospheric structure investigation Open
We report on a thorough analysis of the Mars Pathfinder atmospheric structure investigation (ASI) accelerometer data spanning the altitude range 161–8.9 km. Entry, descent, and landing occurred within 850 km of the Viking 1 lander and some…
View article: Work on Planetary Atmospheres and Planetary Atmosphere Probes
Work on Planetary Atmospheres and Planetary Atmosphere Probes Open
A major objective of the grant was to complete the fabrication, test, and evaluation of the atmosphere structure experiment on the Galileo Probe, and to receive, analyze, and interpret data received from the spacecraft. The grantee was com…
View article: The Galileo Probe Doppler Wind Experiment: Measurement of the deep zonal winds on Jupiter
The Galileo Probe Doppler Wind Experiment: Measurement of the deep zonal winds on Jupiter Open
During its descent into the upper atmosphere of Jupiter, the Galileo probe transmitted data to the orbiter for 57.5 min. Accurate measurements of the probe radio frequency, driven by an ultrastable oscillator, allowed an accurate time hist…
View article: Atmosphere structure and meteorology instrument for Mars Pathfinder
Atmosphere structure and meteorology instrument for Mars Pathfinder Open
The MESUR Science Definition Team recommended that all MESUR probes, including Pathfinder, carry an ASI/MET experiment, in order that no opportunity be lost to characterize the atmosphere of Mars in passing through it. The experiment was t…
View article: Landing site considerations for atmosphere structure and meteorology
Landing site considerations for atmosphere structure and meteorology Open
The goal of the ASI/MET experiments is to extend our knowledge of Mars atmosphere structure and meteorology over that established by the Viking mission. The two in situ soundings of Mars atmosphere by Vikings 1 and 2 were highly similar, b…
View article: Implications of preliminary Vega balloon results for the Venus atmosphere dynamics
Implications of preliminary Vega balloon results for the Venus atmosphere dynamics Open
The typical 1-2 m/sec vertical winds encountered by the Vega balloons probably result from thermal
\nconvection. The consistent 6.5-kelvin differential between the Vega 1 and Vega 2 temperatures is attributable
\nto disturbances of synopti…
View article: Thermal structure in the Venus middle cloud layer
Thermal structure in the Venus middle cloud layer Open
Thermal structure measurements obtained by the two Vega balloons show the Venus atmosphere in the middle cloud layer to be near-adiabatic, on the whole; but discrete air masses are present that differ slightly from one another in potential…
View article: Meteorological Data Along the VEGA-1 and VEGA-2 Float Paths
Meteorological Data Along the VEGA-1 and VEGA-2 Float Paths Open
During their flight through the Venus atmosphere
\nthe Vega 1 and Vega 2 balloon craft measured
\nthe pressure and temperature of the ambient
\nmedium, the vertical wind-velocity component (relative
\nto the gondola), the cloud-layer backs…
View article: The thermal balance of venus in light of the Pioneer Venus Mission
The thermal balance of venus in light of the Pioneer Venus Mission Open
Instruments flown on the Pioneer Venus orbiter and probes measured many of the properties of the atmosphere of Venus which control its thermal balance and support its high surface temperature. Estimates based on orbiter measurements place …
View article: Minimization of the total heat input for manned vehicles entering the earth's atmosphere at hyperbolic speeds
Minimization of the total heat input for manned vehicles entering the earth's atmosphere at hyperbolic speeds Open
Minimization of total heat input for manned vehicles entering atmosphere at hyperbolic speeds
View article: Use of entry vehicle responses to define the properties of the Mars atmosphere.
Use of entry vehicle responses to define the properties of the Mars atmosphere. Open
Principles for determining properties of unknown planetary atmosphere from responses of reentering probe vehicle
View article: Experimental Investigation of a Hypersonic Glider Configuration at a Mach Number of 6 and at Full-Scale Reynolds Numbers
Experimental Investigation of a Hypersonic Glider Configuration at a Mach Number of 6 and at Full-Scale Reynolds Numbers Open
The aerodynamic characteristics of a hypersonic glider configuration, consisting of a slender ogive cylinder with three highly swept wings, spaced 120 apart, with the wing chord equal to the body length, were investigated experimentally at…
View article: An investigation of supersonic turbulent boundary layers on slender bodies of revolution in free flight by use of a Mach-Zehnder interferometer and shadowgraphs
An investigation of supersonic turbulent boundary layers on slender bodies of revolution in free flight by use of a Mach-Zehnder interferometer and shadowgraphs Open
Report presenting a study of slender bodies of revolution in free flight at Mach numbers 3.2 and 3.6, which were photographed and analyzed to obtain the turbulent-boundary-layer density distributions for the case of a body surface that is …
View article: The Prospects for Laminar Flow on Hypersonic Airplanes
The Prospects for Laminar Flow on Hypersonic Airplanes Open
The factors which affect the extent of laminar flow on airplanes for hypersonic flight are discussed on the basis of the available data. Factors considered include flight Reynolds number, surface roughness, angle of attack, angle of leadin…
View article: A Review of Recent Information on Boundary-layer Transition at Supersonic Speeds
A Review of Recent Information on Boundary-layer Transition at Supersonic Speeds Open
Memorandum presenting an investigation to define the relationships between the extent of laminar flow and such variables as surface smoothness, wall temperature, pressure gradient, and Mach number. The purpose of this particular paper is t…
View article: Some aspects of the design of hypersonic boost-glide aircraft
Some aspects of the design of hypersonic boost-glide aircraft Open
Report discussing factors influencing flight range and aerodynamic heating for hypersonic boost-glide aircraft. The possibility and advantages of flight at very high altitude to reduce aerodynamic heating and encourage the preservation of …
View article: Examination of the existing data on the heat transfer of turbulent boundary layers at supersonic speeds from the point of view of Reynolds analogy
Examination of the existing data on the heat transfer of turbulent boundary layers at supersonic speeds from the point of view of Reynolds analogy Open
Note presenting heat-transfer data from four wind-tunnel experiments and two free-flight experiments with turbulent boundary layers to see whether or not they are well represented by the Reynolds analogy or a modification thereof. The data…
View article: Experimental determination of boundary-layer transition on a body of revolution at M = 3.5
Experimental determination of boundary-layer transition on a body of revolution at M = 3.5 Open
Note presenting transition tests made in free-flight on a slender body of revolution at a Mach number of 3.5, wall to free-stream temperature ratio of unity, and with a noiseless and zero-turbulence air stream. The parameter which was vari…
View article: A free-flight wind tunnel for aerodynamic testing at hypersonic speeds
A free-flight wind tunnel for aerodynamic testing at hypersonic speeds Open
The supersonic free-flight wind tunnel is a facility at the Ames Laboratory of the NACA in which aerodynamic test models are gun-launched at high speed and directed upstream through the test section of a supersonic wind tunnel. In this way…
View article: The Ames supersonic free-flight wind tunnel
The Ames supersonic free-flight wind tunnel Open
From Introduction: "Because of the unusual nature of this equipment, and because it is proving to be very useful for certain kinds of aerodynamic research, this report has been prepared. It contains a description of the equipment and its u…
View article: Experimental Investigation of the Drag of 30 Degree, 60 Degree, and 90 Degree Cone Cylinders at Mach Numbers Between 1.5 and 8.2
Experimental Investigation of the Drag of 30 Degree, 60 Degree, and 90 Degree Cone Cylinders at Mach Numbers Between 1.5 and 8.2 Open
Report presenting the total drag coefficients of 60 degree cone cylinders of fineness ratio 2.07 measured in free flight from Mach numbers of 1.5 to 8.2. Results regarding the smooth 60 degree cone cylinder, rifled models, and discontinuit…
View article: The Effect of Nose Shape on the Drag of Bodies of Revolution at Zero Angle of Attack
The Effect of Nose Shape on the Drag of Bodies of Revolution at Zero Angle of Attack Open
The subject of this paper is the drag of the nose section of bodies of revolution at zero angle of attack. The magnitude of the nose drag in relation to the total drag is very distinctly a function of the body design and the Mach number. I…