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Author : James F. Dugan
Publisher : Unknown
Page : 72 pages
File Size : 46,9 Mb
Release : 1960
Category : Mars probes
ISBN : UIUC:30112106589895
Author : James F. Dugan,Carl R. Simsic
Publisher : Unknown
Page : 56 pages
File Size : 45,5 Mb
Release : 1960
Category : Planets
ISBN : NASA:31769000456700
For one-way transfers between Earth and Venus, charts are obtained that show velocity, time, and angle parameters as functions of the eccentricity and semilatus rectum of the Sun-focused vehicle conic. From these curves, others are obtained that are useful in planning one-way and round-trip missions to Venus. The analysis is characterized by circular coplanar planetary orbits, successive two-body approximations, impulsive velocity changes, and circular parking orbits at 1.1 planet radii. For round trips the mission time considered ranges from 65 to 788 days, while wait time spent in the parking orbit at Venus ranges from 0 to 467 days. Individual velocity increments, one-way travel times, and departure dates are presented for round trips requiring the minimum total velocity increment. For both single-pass and orbiting Venusian probes, the time span available for launch becomes appreciable with only a small increase in velocity-increment capability above the minimum requirement. Velocity-increment increases are much more effective in reducing travel time for single-pass probes than they are for orbiting probes. Round trips composed of a direct route along an ellipse tangent to Earth's orbit and an aphelion route result in the minimum total velocity increment for wait times less than 100 days and mission times ranging from 145 to 612 days. Minimum-total-velocity-increment trips may be taken along perihelion-perihelion routes for wait times ranging from 300 to 467 days. These wait times occur during missions lasting from 640 to 759 days.
Author : James F. Dugan,Carl R. Simsic
Publisher : Unknown
Page : 54 pages
File Size : 40,7 Mb
Release : 1960
Category : Planets
ISBN : UIUC:30112106779454
For one-way transfers between Earth and Venus, charts are obtained that show velocity, time, and angle parameters as functions of the eccentricity and semilatus rectum of the Sun-focused vehicle conic. From these curves, others are obtained that are useful in planning one-way and round-trip missions to Venus. The analysis is characterized by circular coplanar planetary orbits, successive two-body approximations, impulsive velocity changes, and circular parking orbits at 1.1 planet radii. For round trips the mission time considered ranges from 65 to 788 days, while wait time spent in the parking orbit at Venus ranges from 0 to 467 days. Individual velocity increments, one-way travel times, and departure dates are presented for round trips requiring the minimum total velocity increment. For both single-pass and orbiting Venusian probes, the time span available for launch becomes appreciable with only a small increase in velocity-increment capability above the minimum requirement. Velocity-increment increases are much more effective in reducing travel time for single-pass probes than they are for orbiting probes. Round trips composed of a direct route along an ellipse tangent to Earth's orbit and an aphelion route result in the minimum total velocity increment for wait times less than 100 days and mission times ranging from 145 to 612 days. Minimum-total-velocity-increment trips may be taken along perihelion-perihelion routes for wait times ranging from 300 to 467 days. These wait times occur during missions lasting from 640 to 759 days.
Author : Gerald Knip,Charles L. Zola
Publisher : Unknown
Page : 168 pages
File Size : 54,7 Mb
Release : 1962
Category : Artificial satellites
ISBN : UIUC:30112106637355
Author : Charles L. Zola,Gerald Knip
Publisher : Unknown
Page : 112 pages
File Size : 42,5 Mb
Release : 1962
Category : Space flight to Venus
ISBN : UIUC:30112106637389
Author : Anonim
Publisher : Unknown
Page : 772 pages
File Size : 48,7 Mb
Release : 1972
Category : Aeronautics
ISBN : UOM:39015006102035
Author : Gary D. Sagerman,Tim J. Kreiter
Publisher : Unknown
Page : 36 pages
File Size : 48,8 Mb
Release : 1966
Category : Electronic
ISBN : UIUC:30112106659201
Author : Anonim
Publisher : Unknown
Page : 44 pages
File Size : 43,5 Mb
Release : 1960
Category : Aerodynamics
ISBN : MINN:30000011021817
Author : David M. Jones
Publisher : Unknown
Page : 1028 pages
File Size : 49,7 Mb
Release : 1962
Category : Aerodynamic heating
ISBN : UOM:39015095305168
A symposium on Aerothermoelasticity was held to present the latest significant developments in each scientific area and engineering area that comprise the component parts of this technology. New and significant contributions were presented in four technical areas consisting of dynamic aerothermoelasticity (flutter), stability and control, thermodynamics and aerodynamics (or aerothermodynamics), and structures including material and construction concepts. Categories important and significant to each technical area are discussed state-of-the-art wise. In addition, 26 separate papers are given on items of special importance.
Author : Charles L. Zola,Laurence H. Fishbach
Publisher : Unknown
Page : 42 pages
File Size : 45,5 Mb
Release : 1966
Category : Mars (Planet)
ISBN : UIUC:30112106599555
Author : Anonim
Publisher : Unknown
Page : 568 pages
File Size : 41,9 Mb
Release : 1965
Category : Mechanics, Applied
ISBN : UCAL:C2682421
Author : W. E. Moeckel
Publisher : Unknown
Page : 40 pages
File Size : 44,7 Mb
Release : 1961
Category : Propulsion systems
ISBN : UIUC:30112106632018
A simple family of indirect-transfer trajectories between circular orbits is used to evaluate the mass ratio required to complete round-trip interplanetary missions using low-thrust propulsion systems. These trajectories, although not optimum, yielded very substantial reductions in total round-trip time for Mars missions with moderate increases in initial weight. For a powerplant specific weight [alpha] of 10 pounds per kilowatt of jet power, trip times were reduced from 1200 to 600 days, for a typical manned mission, with an initial weight increase of a factor of two. Comparison with a nuclear rocket with 1000-second specific impulse indicated that the electric-propulsion system required less initial weight for trip times as low as 550 days with [alpha]=10 and as low at 400 days with [alpha]=5 pounds per kilowatt. Further weight reductions would be expected with more nearly optimum trajectories.
Author : Wolfgang E. Moeckel
Publisher : Unknown
Page : 52 pages
File Size : 48,8 Mb
Release : 1969
Category : Nuclear fission
ISBN : STANFORD:36105024773454
Author : Jack B. Esgar
Publisher : Unknown
Page : 732 pages
File Size : 40,8 Mb
Release : 1960
Category : Gas
ISBN : STANFORD:36105024742038
Author : United States. National Aeronautics and Space Administration
Publisher : Unknown
Page : 300 pages
File Size : 51,8 Mb
Release : 1960
Category : Electronic
ISBN : STANFORD:36105016775848