Direct Descent Download Ebook PDF Epub Online

Author : Frank Herbert
Publisher :
Release : 1983-02-15
Page : 186
Category : Fiction
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Author : Vernon J. Weyers
Publisher :
Release : 1961
Page : 24
Category : Low temperature engineering
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A direct descent is one in which the main descent propulsion system burns continuously from lunar approach to touchdown. The characteristic velocity requirement for direct lunar descents is presented as a function of the landing site location relative to the normal impact point. Results are included for translunar trip times of 60, 75, and 90 hours, for specific impulses representative of both Earth storable and cryogenic propulsion systems, for landing sites located anywhere on the lunar surface, and for ignition thrust-to-Earth weight ratios between 0.12 and 10.0. The data presented are useful in determining approximate performance capability and in evaluating tradeoffs during preliminary mission planning studies.


Author :
Publisher :
Release : 1879
Page :
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Author : Edwin C. Foudriat
Publisher :
Release : 1961
Page : 24
Category : Space trajectories
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"The results of studies of four reentry guidance and control techniques for the energy management of vehicles returning to the earth at escape speeds are compared in this paper. The reentry trajectories are constrained to those of direct descent, that is, where the vehicle does not leave that portion of the atmosphere where useful aerodynamic forces are available after its initial entry. The guidance techniques compared are (1) a piloted simulator study reference trajectory techniques (2) An automatic controller using reference trajectory techniques (3) A predictor system employing linear prediction (perturbation) techniques and (4) A repetitive prediction system employing rapid-time computer techniques."--P. 1.


Author : L. E. Fogarty
Robert Milton Howe
Publisher :
Release : 1968
Page : 36
Category : Space vehicles
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Author : L. E. Fogarty
R. M. Howe
Publisher :
Release : 1968
Page : 35
Category : Computer programs
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Author :
Publisher :
Release : 189?
Page : 3
Category :
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Author : Earl Louis Mountbatten Mountbatten of Burma
Publisher :
Release : 1958
Page : 458
Category :
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Author : Edward F. Nash
Publisher :
Release : 1968
Page : 342
Category :
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Author : Vernon J. Weyers
Publisher :
Release : 1970*
Page : 24
Category :
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Author : Vernon J. Weyers
United States. National Aeronautics and Space Administration
Publisher :
Release : 1970
Page : 25
Category : Direct descent lunar landings
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Author : Robert H. Parker
Publisher :
Release : 1987*
Page : 6
Category :
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Author : Edwin C. Foudriat
Rodney C. Wingrove
Publisher :
Release : 1961
Page : 1
Category :
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Four guidance and control techniques applicable to the reentry from parabolic orbits of vehicles having low lift-drag ratios are described. Techniques include pilot and automatic control to a reference trajectory and the use of prediction to improve and simplify guidance procedures. Comparison between systems is made and areas where further study may be profitable are indicated.


Author : Herbert Junius Allen Hardwicke
Publisher :
Release : 1908
Page : 4
Category :
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Author : Michael Robert Osborne
G. Alistair Watson
Publisher :
Release : 2000
Page : 17
Category : Convex functions
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Author : Alice R. Hall
Publisher :
Release : 1995
Page : 260
Category :
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Richard Hall was born in about 1649 in Stratford-on-Avon, Warwickshire, England. He married Martha and they had seven known children. They emigrated and were living in Bradford,Massachusetts by 1672. He died in 1730. Ancestors, descendants and relatives lived mainly in England, Massachusetts, Maine, New Hampshire, Vermont, Wisconsin and Minnesota.


Author : A. G. M. Hunter
Publisher :
Release : 1979
Page : 25
Category :
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Author : Stan. V. Henkels & Son
Publisher :
Release : 1924
Page : 42
Category :
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Author : Helena Petrovna Blavatsky
Publisher : Philaletheians UK
Release : 2019-09-17
Page : 21
Category : Religion
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There is a mysterious principle in Nature called Maha-Vishnu, which is not the God of that name, but a principle which contains Bija, the seed of Avatarism, i.e., the potency and cause of such divine incarnations. All the World-Saviours, the Bodhisattvas and the Avataras, are the trees of salvation grown out from the one seed. Whether it be called Adi-Buddha or Maha-Vishnu, it is all the same. In this profound esoteric sense, Lord Buddha is an incarnation of Maha-Vishnu. The Avatara is an appearance, one which may be termed a special illusion within the natural illusion that reigns on the planes under the sway of Maya; he is reborn consciously, at his will and pleasure; the units of the common herd unconsciously follow the great law of dual evolution. Thus all Avataras are one and the same: Sons of their Father, in a direct descent and line — the Father, one of Seven Flames, becomes the Son. Father and Son are One, in Eternity. The illusive avataric form having neither past nor future, because it had neither previous incarnation nor will it have subsequent rebirths, has naught to do with Karma, which has therefore no hold on it. Gautama Buddha is more than an Avatara. Though an Avatara in one sense, Gautama is a true human Jivanmukta, owing his position to his outstanding personal merit. His case is an exceptional one, and stems from the occult powers of the High Initiate who, before entering into the state of Nirvana, can cause his “remains” to stay on earth. Buddha and Jesus tower like giants in the history of mankind, in the realm of the spiritual. It is in their image that some enlightened men are born (when a specific humanitarian object is in view) and hypostatically animated by their divine prototypes, are reproduced again and again by the mysterious Powers that control and guide the destinies of our world. Not only does this statement apply to prominent characters in history, in general, but also to men of genius, to every remarkable man of the age, who soars beyond the common herd with some abnormally developed special capacity in him, leading to the progress and good of mankind. Since then the “Man of Sorrows” has returned more than once, unknown to, and undiscovered by, his blind followers. Since then, the “Son of God” has been most cruelly crucified, daily and hourly, by the Churches founded in his name. Even the Apostles, only half-initiated, failed to tarry for their Master and, not recognizing him, spurned him every time he returned. Special cases conferring permanent Theophania, i.e., the presence of God in man, a divine incarnation. A person of a sufficiently clean vessel might be selected for special purposes by his personal God, the Fountainhead of his Monad, who thus becomes his in-dweller. Such persons remain in our sphere and within human attraction and reach; and thus it is that not only a Buddha, a Shankacharya, or a Jesus that animate several persons at one and the same time, but even the principles of a high Adept may be animating the outward tabernacles of worthy mortals.


Author : Ellen Duane Davis
Publisher :
Release : 1924
Page : 42
Category :
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