Encyclopedia of Space Science and Technology, 2 Volume Set - Hardcover

Hardcover

ISBN 10: 0471324086 ISBN 13: 9780471324089

Verlag: Wiley-Interscience, 2003

Inhaltsangabe

A comprehensive resource on the past, present, and future of space technology

Researchers in optics, materials processing, and telecommunications require a reference that can provide a quick study of a number of basic topics in space science. The two-volume Encyclopedia of Space Science and Technology represents an ambitious collection of the underlying physical principles of rockets, satellites, and space stations; what is known by astronomers about the sun, planets, galaxy, and universe; and the effect of the space environment on human and other biological systems. The Encyclopedia covers a variety of fundamental topics, including:

• A state-of-the-art summary of the engineering involved in launching a rocket or satellite
• The control systems involved on the ground, in orbit, or in deep space
• Manufacturing in space from planetary and other resources

Physicists, astronomers, engineers, and materials and computer scientists, as well as professionals in the aircraft, telecommunication, satellite, optical, and computer industries and the government agencies, will find the Encyclopedia to be an indispensable resource.

Über diesen Titel

Über die Autorin bzw. den Autor

HANS MARK, PhD, is presently associated with the Aerospace Engineering & Mechanics Division of Woolrich Labs at the University of Texas at Austin. He has previously served as the deputy director of NASA and as chancellor of the University of Texas System.

Von der hinteren Coverseite

A comprehensive resource on the past, present, and future of space technology

Researchers in optics, materials processing, and telecommunications require a reference that can provide a quick study of a number of basic topics in space science. The two-volume Encyclopedia of Space Science and Technology represents an ambitious collection of the underlying physical principles of rockets, satellites, and space stations; what is known by astronomers about the sun, planets, galaxy, and universe; and the effect of the space environment on human and other biological systems. The Encyclopedia covers a variety of fundamental topics, including:
* A state-of-the-art summary of the engineering involved in launching a rocket or satellite
* The control systems involved on the ground, in orbit, or in deep space
* Manufacturing in space from planetary and other resources

Physicists, astronomers, engineers, and materials and computer scientists, as well as professionals in the aircraft, telecommunication, satellite, optical, and computer industries and the government agencies, will find the Encyclopedia to be an indispensable resource.

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Encyclopedia of Space Science and Technology, 2 Volume Set

John Wiley & Sons

Copyright © 2003 Hans Mark
All right reserved.
ISBN: 978-0-471-32408-9

Chapter One

A

AIR AND SHIP-BASED SPACE LAUNCH VEHICLES

Introduction

In 1957, the Soviet Union placed the first man-made object in orbit around the earth. Since then, numerous launch vehicles have been developed to improve the performance, reliability, and cost of placing objects in orbit. By one estimate, roughly 75 active space launch vehicles either have established flight records or are planning an inaugural launch within the year. This does not include the numerous launch vehicles from around the world that are no longer operational such as the Jupiter, Redstone, Juno, Saturn, Scout, Thor, Vanguard, and Conestoga family of rockets from the United States or the N-1 from the former Soviet Union, to name just a few. Despite the many differences among all of these launch vehicles from both past and present, one common element can be found in all but four of them: they are ground-launched. Of the four exceptions, two are air-launched (NOTSNIK and Pegasus), one is ship-launched (Sea Launch), and one is submarine-launched (Shtil). It is important to keep in mind that numerous air-launched and ship-launched suborbital launch systems are in use by militaries, commercial entities, and educational institutions. However, the four mentioned are the only mobile launch systems that can place objects into a sustainable Earth orbit.

Mobile Space-Launched Vehicles

Project Pilot (NOTSNIK). NOTSNIK is the oldest and, until recently, the least well known of the four mobile space-launched systems. Following the launch of Sputnik by the Soviet Union, President Eisenhower's administration elicited proposals to launch a satellite into orbit. The Naval Ordinance Test Station (NOTS) located at China Lake in California proposed launching a rocket from a jet fighter. The idea is the same as that of the current Pegasus vehicle: reduce the amount of energy needed to place a payload into orbit by launching it above the denser portion of the atmosphere. In this fashion, the engineers at NOTS designed a vehicle from existing rocket motors that could place a 2-pound satellite in a 1500-mile-high orbit. The engineers recognized the energy savings from such a launch concept and also the utility of such a flexible platform. Launching from a jet fighter could, theoretically, place a satellite into any orbit from anywhere in the world at any time.

The U.S. Navy accepted the proposal from NOTS in 1958, by some accounts as a safety net in the event that the ongoing Vanguard project was unsuccessful. The program was officially called Project Pilot, but the engineers at NOTS preferred the name NOTSNIK in direct reference to the Soviet satellite that was currently orbiting above them and the rest of the world. A Douglas Aircraft F4D-1 Skyray was the carrier aircraft for the rocket and consequently was considered the first stage. The second and third stages were modified antisubmarine missiles. The final stage was taken from a Vanguard rocket. The entire launch vehicle measured a mere 14 feet in length and had four fins at the aft end that provided a span of 5 feet.

The NOTSNIK was launched six times from an altitude of about 41,000 ft. Four of those launches ended in known failures. However, the results of two have never been verified. Some in the program insist that they achieved their goal of placing the small payload of diagnostic instruments in orbit. At least one ground station in New Zealand picked up a signal in the right place at the right time. However, confirmation that the signal was from the NOTSNIK payload was never established. Even the possibility of a success was veiled in secrecy for more than 40 years for, by all accounts, two critical reasons. The first was that in the days following the early embarrassments of Vanguard, the Eisenhower administration did not want to claim success unless it was absolutely certain. The second reason was that a mobile air-launched system that could reach orbit had extremely appealing military applications. However, the tactical advantages of such a system were far outweighed by the strategic consequences, as stated in the Antiballistic Missile (ABM) Treaty between the United States and the former Soviet Union that was concluded in 1972:

Further, to decrease the pressures of technological change and its unsettling impact on the strategic balance, both sides agree to prohibit development, testing, or deployment of sea-based, air-based, or space-based ABM systems and their components, along with mobile land-based ABM systems. Should future technology bring forth new ABM systems 'based on other physical principles' than those employed in current systems, it was agreed that limiting such systems would be discussed, in accordance with the Treaty's provisions for consultation and amendment.

Pegasus. Roughly 30 years later, while NOTSNIK remained an official government secret, the idea of launching payloads into space from an airborne platform was revisited in the form of the Pegasus launch vehicle. The driving forces behind NOTSNIK and Pegasus were essentially the same. An air-launched space vehicle provides several advantages compared with ground-based counterparts.

As an example, Pegasus is launched at an altitude of 39,000 ft, which is above a significant portion of the atmosphere. As mentioned, with NOTSNIK, this eliminates the need for extra performance that would otherwise be needed to overcome atmospheric forces. This also implies that the structural components of the vehicle can be lighter, which improves the efficiency of the rocket as a whole. The energy required from the launch vehicle is also reduced by the speed already achieved by the carrier aircraft. An air-launched system also allows applying more of the impulse of the first stage along the velocity vector. This is a more efficient use of the vehicle's energy than that of ground-launched vehicles that must first apply the thrust almost perpendicular to the velocity vector already imparted by Earth's rotation. These factors combine to produce a requirement for a velocity increment that is on the order of 10% less than a comparable ground-launched rocket.

The Pegasus vehicle is a winged, three-stage, solid rocket booster (Fig. 1). It is the first space-launched vehicle developed solely with commercial funding. Three versions have been developed and flown over the years: Standard, Hybrid, and XL. The XL is the only vehicle within the Pegasus family currently in production. The XL is roughly 10,000 lbm heavier than the Standard or Hybrid models and is roughly 6 ft longer. Because the XL extends farther aft beneath the L-1011 carrier aircraft, the port and starboard fins become an obstacle to the landing gear doors. To correct this problem, the port and starboard fins were modified to include an anhedral of 23. To maintain commonality between the various members of the Pegasus family of vehicles, the same anhedral was introduced into the Standard vehicle, which was then given the designation Pegasus Hybrid. Other than the anhedral of the fins, the Standard and Hybrid vehicles are exactly the same. The Standard, the first Pegasus vehicle built, was flown on six missions. The Hybrid vehicle has flown four times. The XL vehicle has flown 21 times. Of 31 Pegasus launches, only three missions failed to reach orbit.

The Pegasus XL was designed and developed to provide increased performance above and beyond that provided by the Standard and Hybrid vehicles. A typical...

Details zur Ausgabe

• Verlag: Wiley-Interscience
• Erscheinungsdatum: 2003
• Sprache: Englisch
• ISBN 10: 0471324086
• ISBN 13: 9780471324089
• Einband: Gebundene Ausgabe
• Auflage: 1
• Anzahl der Seiten: 1864
• Herausgeber: Mark Hans
• Kontakt zum Hersteller: Wiley-VCH GmbH; product_safety@wiley.com; ; Boschstrasse 12; Weinheim; 69469; Deutschland