When NASA went shopping for a booster to use in the Mercury program they found that the Atlas rockets would cost approximately $2.5 million each and that even the Redstone would cost about $1 million per launching. The managers of the Mercury program recognized from the start that the numerous early test flights would have to be accomplished by a far less expensive booster system. As it turned out, the Little Joe rocket NASA designed, cost about $ 200,000 each.
In January 1958 Max Faget and Paul Purser had worked out in considerable detail on paper how to cluster four of the solid-fuel Sergeant rockets, in standard use at Wallops Island, to boost a manned nose cone above the stratosphere. Faget's short-lived "High Ride" proposal had suffered from comparisons with "Project Adam" at that time, but in August 1958 William Bland and Ronald Kolenkiewicz had returned to their preliminary designs for a cheap cluster of solid rockets to boost full-scale and full-weight model capsules above the atmosphere. As drop tests of boilerplate capsules provided new aerodynamic data on the dynamic stability of the configuration in free-fall, the need for comparable data quickly on the powered phase became apparent. So in October 1958, a NASA team prepared new engineering layouts and estimates for the mechanical design of the booster structure and a suitable launcher.
As the blueprints for this cluster of four rockets began to emerge from their drawing boards, the designers' nickname for their project gradually was adopted. Since their first cross-section drawings showed four holes up, they called the project "Little Joe," from the crap-game throw of a double deuce on the dice. Although four smaller circles were added later to represent the addition of Recruit rocket motors, the original name stuck. The appearance on engineering drawings of the four large stabilizing fins protruding from its airframe also helped to perpetuate the name Little Joe had acquired.
The primary purpose of this relatively small and simple booster system was to save money - by allowing numerous test flights to qualify various solutions to the myriad problems associated with the development of manned space flight, especially the problem of escaping from an explosion midway through takeoff. Capsule aerodynamics under actual reentry conditions was another primary concern. To gain this kind of experience as soon as possible, its designers had to keep the clustered booster simple in concept; it should use solid fuel and existing proven equipment whenever possible, and should be free of any electronic guidance and control systems.
The designers made the Little Joe booster assembly to approximate the same performance that the Army's Redstone booster would have with the capsule payload. But in addition to being flexible enough to perform a variety of missions, Little Joe could be made for about one-fifth the basic cost of the Redstone, would have much lower operating costs, and could be developed and delivered with much less time and effort. And, unlike the larger launch vehicles, Little Joe could be shot from the existing facilities at Wallops Island. It still might even be used to carry a man some day.
Twelve companies responded during November 1958, to the invitations for bids to construct the airframe of Little Joe. The technical evaluation of these proposals was carried on in much the same manner as for the spacecraft, except that Langley Research Center itself carried the bulk of the administrative load. The Missile Division of North American Aviation won the contract on December 29, 1958, and began work immediately at Downey, California, on its order for seven booster airframes and one mobile launcher.
The primary mission objectives for Little Joe as seen in late 1958 (in addition to studying the capsule dynamics at progressively higher altitudes) were to test the capsule escape system at maximum dynamic pressure, to qualify the parachute system, and to verify search and retrieval methods. But since each group of specialists at work on the project sought to acquire firm empirical data as soon as possible, more exact priorities had to be established. The first flights were to secure measurements of inflight and impact forces on the capsule; later flights were to measure critical parameters at the progressively higher altitudes of 20,000, 250,000, and 500,000 feet. The minimum aims of each Little Joe shot could be supplemented from time to time with studies of noise levels, heat and pressure loads, heatshield separation, and the behavior of animal riders, so long as the measurements could be accomplished with minimum telemetry. Since all the capsules boosted by the Little Joe rockets were expected to be recovered, onboard recording techniques would also contribute to the simplicity of the system.
Unique as the only booster system designed specifically and solely for manned capsule qualifications, Little Joe was also one of the pioneer operational launch vehicles using the rocket cluster principle. Since the four modified Sergeants (called either Castor or Pollux rockets, depending upon modification) and four supplemental Recruit rockets were arranged to fire in various sequences, the takeoff thrust varied greatly, but maximum design thrust was almost 230,000 pounds. Theoretically enough to lift a spacecraft of about 4,000 pounds on a ballistic path over 100 miles high, the push of these clustered main engines should simulate the takeoff profile in the environment that the manned Atlas would experience. Furthermore, the additional powerful explosive pull of the tractor-rocket escape system could be demonstrated under the most severe takeoff conditions imaginable. The engineers who mothered Little Joe to maturity knew it was not much to look at, but they fondly hoped that their ungainly rocket would prove the legitimacy of most of the ballistic capsule design concepts, thereby earning its own honor.
Launch Vehicle Development
As of January 21, 1960, the Little Joe series of five actual and attempted flights had expended four of the six test boosters North American had made for NASA and five prototype capsules made in the Langley shops. The primary test objectives for these solid-fuel-boosted models were an integral part of the development flight program conducted within NASA by the Space Task Group, with Langley and Wallops support. Now only two Little Joe boosters remained for the qualification flight tests. North American had manufactured seven Little Joe airframes, but one of these had been retained at the plant in Downey, California, for static loading tests. STG ordered the refurbishment of this seventh airframe so as to have three Little Joe boosters for the qualification flight program. The success of Little Joe 1-B in January 1960 meant that the next flight, the sixth, to be known as LJ-5, would be the first to fly a real Mercury capsule from the McDonnell production line. In passing from development flight tests with boilerplate models to qualification flight tests with the "real McDonnell" capsule, the Space Task Group moved further away from research into development and toward operations.
Specifications
- Little Joe I
- Thrust: 1,044 kN
- Length: 15.2 m
- Diameter: 2.03 m
- Fin Span: 6.5 m
- Weight: 12,700 kg
- Fuel: Solid
- Burn Time: ~40 s
- Recruit rocket (Thiokol XM19)
- Thrust: (167 kN)
- Length: (2.7 m)
- Diameter: (0.23 m)
- Weight: (159 kg)
- Fuel: Solid
- Burn Time: 1.53 s
- Castor rocket (Thiokol XM33)
- Thrust: (259 kN)
- Length: (6.04 m)
- Diameter: (0.79 m)
- Weight: (4,424 kg)
- Fuel: Solid
- Burn Time: 37 s
External links
- [http://www.hq.nasa.gov/office/pao/History/SP-4201/toc.htm NASA - This New Ocean: A History of Project Mercury]
- [http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19670022649_1967022649.pdf NASA Report: Performance characteristics of the Little Joe launch vehicle - September 1962]
Category:Space launch vehiclesCategory:Mercury program
NASA
]
The National Aeronautics and Space Administration (NASA), which was established in 1958, is the agency responsible for the public space program of the United States of America. It is also responsible for long-term civilian and military aerospace research.
Vision and mission
NASA's vision is "to improve life here, extend life to there, and to find life beyond." Its mission is "to understand and protect our home planet; to explore the Universe and search for life; and to inspire the next generation of explorers."
History
Space Race
:For additional background, please see the Space Race articleSpace Race launch of Redstone rocket and NASA's Mercury 3 capsule Freedom 7 with Alan Shepard Jr. on the United States' first human flight into sub-orbital space. (Atlas rockets were used to launch Mercury's orbital missions.)]]
Following the Soviet space program's launch of the world's first man-made satellite (Sputnik 1) on October 4, 1957, the attention of the United States turned toward its own fledgling space efforts. The U.S. Congress, alarmed by the perceived threat to U.S. security and technological leadership, urged immediate and swift action; President Dwight D. Eisenhower and his advisers counseled more deliberate measures. Several months of debate produced agreement that a new federal agency was needed to conduct all nonmilitary activity in space.
On July 29, 1958, President Eisenhower signed the National Aeronautics and Space Act of 1958 establishing the National Aeronautics and Space Administration (NASA). When it began operations on October 1, 1958, NASA consisted mainly of the four laboratories and some 8,000 employees of the government's 46-year-old research agency for aeronautics, the National Advisory Committee for Aeronautics (NACA), though the probably most important contribution actually had its roots in the German rocket program led by Wernher von Braun, who is today regarded as the father of the United States space program.
NASA's early programs were research into human spaceflight, and were conducted under the pressure of the competition between the USA and the USSR (the Space Race) that existed during the Cold War. The Mercury program, initiated in 1958, started NASA down the path of human space exploration with missions designed to discover simply if man could survive in space. Representatives from the U.S. Army (M.L. Raines, LTC, USA), Navy (P.L. Havenstein, CDR, USN) and Air Force (K.G. Lindell, COL, USAF) were selected/requested to provide assistance to the NASA Space Task Group through coordination with the existing U.S. military research and defense contracting infrastructure, and technical assistance resulting from experimental aircraft (and the associated military test pilot pool) development in the 1950s. On May 5, 1961, astronaut Alan B. Shepard Jr. became the first American in space when he piloted Freedom 7 on a 15-minute suborbital flight. John Glenn became the first American to orbit the Earth on February 20, 1962 during the 5-hour flight of Friendship 7.
Once the Mercury project proved that human spaceflight was possible, project Gemini was launched to conduct experiments and work out issues relating to a moon mission. The first Gemini flight with astronauts on board, Gemini III, was flown by Virgil "Gus" Grissom and John W. Young on March 23, 1965. Nine other missions followed, showing that long-duration human space flight was possible, proving that rendezvous and docking with another vehicle in space was possible, and gathering medical data on the effects of weightlessness on humans.
Apollo program
Following the success of the Mercury and Gemini programs, the Apollo program was launched to try to do interesting work in space and possibly put men around (but not on) the Moon. The direction of the Apollo program was radically altered following President John F. Kennedy's announcement on May 25, 1961 that the United States should commit itself to "landing a man on the Moon and returning him safely to the Earth" by 1970. Thus Apollo became a program to land men on the Moon. The Gemini program was started shortly thereafter to provide an interim spacecraft to prove techniques needed for the now much more complicated Apollo missions.
Gemini program.]]
After eight years of preliminary missions, including NASA's first loss of astronauts with the Apollo 1 launch pad fire, and the first spacecraft to orbit the Moon (Apollo 8) at the end of 1968, the Apollo program achieved its goals with Apollo 11 which landed Neil Armstrong and Buzz Aldrin on the moon's surface on July 20, 1969 and returned them to Earth safely on July 24. Armstrong's first words upon stepping out of the Eagle lander captured the momentousness of the occasion: "That's one small step for [a] man, one giant leap for mankind." Twelve men would set foot on the Moon by the end of the Apollo program in December 1972.
NASA had won the moon race, and in some senses this left it without direction, or at the very least without the public attention and interest that was necessary to guarantee large budgets from Congress. After President Lyndon Johnson left office, NASA lost its main political supporter, and rocket scientist Wernher von Braun was moved to a position lobbying in Washington. Plans for ambitious follow-on projects to construct a space station, establish a lunar base and launch a human mission to Mars by 1990 were proposed but with the end to procurement of Saturn and Apollo hardware, there was no capability to support these. The near-disaster of Apollo 13, where an oxygen tank explosion nearly doomed all three astronauts, helped to recapture national attention and concern. Although missions up to Apollo 20 were planned, Apollo 17 was the last mission to fly under the Apollo banner. The program ended because of budget cuts (in part due to the Vietnam War) and the desire to develop a reusable space vehicle.
Other early missions
Although the vast majority of NASA's budget has been spent on human spaceflight, there have been many robotic missions instigated by the space agency. In 1962 the Mariner 2 mission was launched and became the first spacecraft to make a flyby of another planet – in this case Venus. The Ranger, Surveyor, and Lunar Orbiter missions were essential to assessing lunar conditions before attempting Apollo landings with humans on board. Later, the two Viking probes landed on the surface of Mars and sent color images back to Earth, but perhaps more impressive were the Pioneer and particularly Voyager missions that visited Jupiter, Saturn, Uranus and Neptune sending back scientific information and color images.
Having lost the moon race, the Soviet Union had, along with the USA, changed its approach. On July 17, 1975 an Apollo craft (finding a new use after the cancelling of planned lunar flights) was docked to the Soviet Soyuz 19 spacecraft, in the Apollo-Soyuz Test Project. Although the Cold War would last many more years, this was a critical point in NASA's history and much of the international co-operation in space exploration that exists today has its genesis with this mission. America's first space station, Skylab, occupied NASA from the end of Apollo until the late 1970s.
Shuttle era
Skylab1981 ]]
The space shuttle became the major focus of NASA in the late 1970s and the 1980s. Planned to be a frequently launchable and mostly reusable vehicle, four space shuttles were built by 1985. The first to launch, Columbia did so on April 12, 1981.
The shuttle was not all good news for NASA – flights were much more expensive than initially projected, and even after the 1986Challenger disaster highlighted the risks of space flight, the public again lost interest as missions appeared to become mundane. Work began on Space Station Freedom as a focus for the manned space programme but within NASA there was argument that these projects came at the expense of more inspiring unmanned missions such as the Voyager probes. The Challenger disaster aside the late 1980s marked a low point for NASA.
Nonetheless, the shuttle has been used to launch milestone projects like the Hubble Space Telescope (HST). The HST was created with a relatively small budget of $2 billion but has continued operation since 1990 and has delighted both scientists and the public. Some of the images it has returned have become near-legendary, such as the groundbreaking Hubble Deep Field images. The HST is a joint project between ESA and NASA, and its success has paved the way for greater collaboration between the agencies.
In 1995 Russian-American interaction would again be achieved as the Shuttle-Mir missions began, and once more a Russian craft (this time a full-fledged space station) docked with an American vehicle. This cooperation continues to the present day, with Russia and America the two biggest partners in the largest space station ever built – the International Space Station (ISS). The strength of their cooperation on this project was even more evident when NASA began relying on Russian launch vehicles to service the ISS following the 2003Columbia disaster, which grounded the shuttle fleet for well over two years.
Costing over one hundred billion dollars, it has been difficult at times for NASA to justify the ISS. The population at large have historically been hard to impress with details of scientific experiments in space, preferring news of grand projects to exotic locations. Even now, the ISS cannot accommodate as many scientists as planned.
During much of the 1990s, NASA was faced with shrinking annual budgets due to Congressional belt-tightening in Washington, DC. In response, NASA's ninth administrator, Daniel S. Goldin, pioneered the "faster, better, cheaper" approach that enabled NASA to cut costs while still delivering a wide variety of aerospace programs (Discovery Program). That method was criticized and re-evaluated following the twin losses of Mars Climate Orbiter and Mars Polar Lander in 1999.
NASA's future
Mars Polar Lander and the planned crew and heavy lift launch vehicles]]
NASA's most publicly-inspiring mission of recent years has probably been the Mars Pathfinder mission of 1997. Newspapers around the world carried images of the lander dispatching its own rover, Sojourner, to explore the surface of Mars in a way never done before at any extra-terrestrial location. Less publicly acclaimed but performing science from 1997 to date (2005) has been the Mars Global Surveyor orbiter. Since 2001, the orbiting Mars Odyssey has been searching for evidence of past or present water and volcanic activity on the red planet. NASA expects to continue exploring the Red Planet with more spacecraft such as the Mars Reconnaissance Orbiter, which will reach Mars in 2006.
The Space Shuttle Columbia disaster in 2003, which killed the crew of six American and one Israeli astronaut, and caused a 29-month hiatus in space shuttle flights, triggered a serious re-examination of NASA's priorities. The U.S. government, various scientists, and the public all considered the future of the space program.
On January 14, 2004, ten days after the landing of Mars Exploration RoverSpirit, President George W. Bush announced a new plan for NASA's future, dubbed the Vision for Space Exploration. According to this plan, humankind will return to the moon by 2020, and set up outposts as a testbed and potential resource for future missions. The space shuttle will be retired in 2010 and the Crew Exploration Vehicle will replace it by 2014, capable of both docking with the ISS and leaving the Earth's orbit. The future of the ISS is somewhat uncertain – construction will be completed, but beyond that is less clear. Although the plan initially met with skepticism from Congress, in late 2004 Congress agreed to provide start-up funds for the first year's worth of the new space vision.
Hoping to spur innovation from the private sector, NASA established a series of Centennial Challenges, technology prizes for non-government teams, in 2004. The Challenges include tasks that will be useful for implementing the Vision for Space Exploration, such as building more efficient astronaut gloves.
Criticisms
Some commentators, such as Mark Wade, note that NASA has suffered from a 'stop-start' approach to its human spaceflight programs. The Apollo spacecraft and Saturn family of launch vehicles were abandoned in 1970 after billions of dollars had been spent on their development. In 2004 the U.S. Government proposed eventually replacing the Shuttle with a Crew Exploration Vehicle that would allow the agency to again send astronauts to the Moon. Despite the reduction of its budget following project Apollo, NASA has maintained a top-heavy bureaucracy resulting in inflated costs and compromised hardware.
Crew Exploration Vehicle on October 31, 1998.]]
Currently, the ISS relies on the Shuttle fleet for all major construction shipments.
The Shuttle fleet has lost two spacecraft and fourteen astronauts in two disasters in 1986 and 2003.
While the 1986 loss was made up with a Shuttle built from replacement parts, NASA does not plan to build another shuttle to replace the second loss. (But see also CEV.)
The ISS, which was intended to have a crew of seven as of 2005, now has a skeleton crew of two, causing many intended research projects to be delayed.
Other nations that have invested heavily in the space station's construction, such as the members of the European Space Agency, are fearful that the ISS's fate will soon match the fate of Skylab. As of 2005, however, all of the European and Japanese contributions to the ISS are years behind development schedule themselves.
- 1958 – National Aeronautics and Space Administration PL 85-568 (passed on July 29)
- 1961 – Apollo mission funding PL 87-98 A
- 1970 – National Aeronautics and Space Administration Research and Development Act PL 91-119
- 1984 – National Aeronautics and Space Administration Authorization Act PL 98-361
- 1988 – National Aeronautics and Space Administration Authorization Act PL 100-685
- NASA Budget 1958–2005 in 1996 Constant Year Dollars
- [http://www.nasa.gov NASA Home Page]
- [http://www.nasawatch.com NASA Watch]
-
Further research
- [http://history.nasa.gov/series95.html NASA History Series Publications]
- [http://history.nasa.gov/SP-4012/cover.html NASA Historical Data Books (SP-4012)]
- [http://www.hq.nasa.gov/office/pao/History/hhrhist.pdf Research in NASA History: A Guide to the NASA History Program (large PDF – over 1,012 kb)]
- [http://ntrs.nasa.gov/ NTRS: NASA Technical Reports Server]
- [http://www.eventscope.org Eventscope]
Category:Independent Agencies of the United States Governmentko:미국항공우주국ja:アメリカ航空宇宙局simple:NASAth:องค์การนาซา
Project Mercury
Project Mercury was the United States first successful manned spaceflight program. It ran from 1959 through 1963 with the goal of putting a man in orbit around the Earth. Early planning and research was carried out by NACA, while the program was officially carried out by the newly created NASA. The name Mercury comes from the Roman god (it is also the name of the innermost planet of the solar system).
The Mercury program cost $1.5 billion in 1994 dollars. See NASA Budget.
Spacecraft
__NOTOC__
Mercury spacecraft (also called a capsule or space capsule) were very small one-man vehicles; it was said that the Mercury spacecraft were not ridden, they were worn. Only 1.7 cubic meters in volume, the Mercury capsule was barely big enough to include its pilot. Inside were 120 controls: 55 electrical switches, 30 fuses and 35 mechanical levers. The spacecraft was designed by Max Faget and NASA's Space Task Group.
During the launch phase of the mission, the Mercury spacecraft and astronaut were protected from launch vehicle failures by the Launch Escape System. The LES consisted of a solid fuel, 52,000 lbf (231 kN) thrust rocket mounted on a tower above the spacecraft. In the event of a launch abort, the LES fired for 1 second, pulling the Mercury spacecraft away from a defective launch vehicle. The spacecraft would then descend on its parachute recovery system. After booster engine cutoff (BECO), the LES was no longer needed and was separated from the spacecraft by a solid fuel, 800 lbf (3.6 kN) thrust jettison rocket, that fired for 1.5 seconds.
To separate the Mercury spacecraft from the launch vehicle, the spacecraft fired three small solid fuel, 400 lbf (1.8 kN) thrust rockets for 1 second. These rockets are called the Posigrade rockets.
The spacecraft had only attitude control thrusters. After orbit insertion and before retrofire they could not change their orbit. The spacecraft had three sets of control jets for each axis (yaw, pitch and roll), supplied from two separate fuel tanks. An automatic set of high and low powered jets and a set of manual jets, fueled from either the automatic tank or the manual tank. The pilot could use any one of the three thruster systems and fuel them from either of the two fuel tanks to provide spacecraft attitude control.
The Mercury spacecraft were designed to be totally controllable from the ground in the event that the space environment impaired the pilot's ability to function.
The spacecraft had three solid fuel, 1000 lbf (4.5 kN) thrust retrorockets that fired for 10 seconds each. One was sufficient to return the spacecraft to earth if the other two failed. The first retro was fired, five seconds later the second was fired (while the first was still firing). Five seconds after that, the third retro fires (while the second retro is still firing). This is called ripple firing.
There was a small metal flap at the nose of the spacecraft called the "spoiler". If the spacecraft started to reenter nose first (another stable reentry attitude for the capsule), airflow over the "spoiler" would flip the spacecraft around to the proper, heatshield first reentry attitude.
Suborbital Mercury capsules encountered lower reentry temperatures and used berylliumheat-sinkheat shields. Orbital missions encountered much higher atmospheric friction and temperatures during reentry and used ablative shields.
NASA ordered 20 production spacecraft, numbered 1 through 20, from McDonnell Aircraft Company, St. Louis, Missouri. Five of the twenty spacecraft were not flown. They were, Spacecraft #10, 12, 15, 17, and 19. Two unmanned spacecraft were destroyed during flights. They were Spacecraft #3 and #4. Spacecraft #11 sank and was recovered from the bottom of the Atlantic Ocean after 38 years. Some spacecraft were modified after initial production (refurbished after launch abort, modified for longer missions, etc) and received a letter designation after their number, examples 2B, 15B. Some spacecraft were modified twice, example, spacecraft 15 became 15A and then 15B.
A number of boilerplate spacecraft (mockup/prototype/replica spacecraft, made from non-flight materials or lacking production spacecraft systems and/or hardware) were also made by NASA and McDonnell Aircraft and used in numerous tests, including launches.
Boosters
ablative
The Mercury program used three boosters: Little Joe, Redstone, and Atlas. Little Joe was used to test the escape tower and abort procedures. Redstone was used for suborbital flights, and Atlas for orbital ones. Starting in October, 1958, Jupiter missiles were also considered as suborbital launch vehicles for the Mercury program, but were cut from the program in July, 1959 due to budget constraints. The Atlas boosters required extra strengthening in order to handle the increased weight of the Mercury capsules beyond that of the nuclear warheads they were designed to carry. Little Joe was a solid-propellant booster designed specially for the Mercury program.
The Titan missile was also considered for use for later Mercury missions, however the Mercury program was terminated before these missions were flown. The Titan was used for the Gemini program which followed Mercury
Astronauts
Gemini program
The first Americans to venture into space were drawn from a group of 110 military pilots chosen for their flight test experience and because they met certain physical requirements. Seven of those 110 became astronauts in April 1959. Six of the seven flew Mercury missions (Deke Slayton was removed from flight status due to a heart condition). Beginning with Alan Shepard's Freedom 7 flight, the astronauts named their own spacecraft, and all added 7 to the name to acknowledge the teamwork of their fellow astronauts
Mercury had seven prime astronauts, all former military test pilots, known as the Mercury 7. NASA announced the selection of these astronauts on April 9, 1959.
- M. Scott Carpenter (1925-)
- L. Gordon Cooper, Jr. (1927-2004)
- John H. Glenn. Jr. (1921-) (first American to orbit the earth)
- Virgil I. "Gus" Grissom (1926-1967)
- Walter M. Schirra, Jr. (1923-)
- Alan B. Shepard, Jr. (1923-1998) (first American in space)
- Donald K. "Deke" Slayton (1924-1993) (grounded in 1962 due to irregular heartbeat, reinstated in 1972 and later flew on Apollo-Soyuz Test Project in 1975)
Flights
The program included 20 robotic launches. Not all of these were intended to reach space and not all were successful in completing their objectives. The fifth flight in 1959 launched a monkey named Sam (a rhesus monkey named after the Air Force School of Aviation Medicine) into space. Other non-human space-farers were Miss Sam (a rhesus monkey), Ham and Enos, both chimpanzees.
The Mercury program used the following launch vehicles:
- Little Joe - Suborbital, robotic, and primate flights. Launch escape system tests
- Redstone - Suborbital robotic, primate and piloted orbital flights.
- Atlas - Suborbital robotic, robotic, primate, and piloted orbital flights.
Flight patches are available to the public that purport to be patches from various Mercury missions. In reality, these patches were designed long after the Mercury program ended by private entrepreneurs. When genuine flight patches were created by crews in the Gemini program, this caused a public demand for Mercury flight patches, which was filled by these private entrepreneurs. The only patches the Mercury astronauts wore were the NASA logo and a name tag. Each manned Mercury spacecraft, however, was decorated with a flight insignia. These are the genuine Mercury flight insignias. They were approved by the Mercury astronauts and painted on their spacecraft. Each flight insignia is illustrated in the photo above.
Follow-on programs
Miscellaneous
The Mercury astronauts trained, in part, at Langley Air Force Base in Hampton, Virginia, under Flight Surgeon William K. Douglas and Keith G. Lindell (COL, USAF). Several bridges throughout the city bear the name of the Mercury astronauts, and the main route in the city is named Mercury Boulevard, honoring the Mercury program.
The names of five of the Mercury astronauts are also commemorated in the popular 1960s TV show Thunderbirds. In the series, Jeff Tracy, the founder of the fictional International Rescue organisation, is a millionaire ex-astronaut who has named his five sons -- Scott, Virgil, Alan, John and Gordon -- after the real-life Mercury astronauts.
Further reading
- Gene Kranz, Failure is Not an Option. Factual, from the standpoint of a chief flight controller during the Mercury, Gemini, and Apollo space programs. ISBN 0743200799
- Tom Wolfe, The Right Stuff. Sentimental, from the astronaut viewpoint, not meant to be taken as a strict history, but fascinating anyway.
- Schirra, Grissom, Glenn, Slayton, Shepherd, Carpenter, Cooper, We Seven. (ISBN B00005X54G); Simon & Schuster - 1962. Factual; a collection of articles written by the seven Mercury astronauts describing events from their points of view.
- James M. Grimwood, [http://www.hq.nasa.gov/office/pao/History/SP-4201/cover.htm This New Ocean: A History of Project Mercury] - James M. Grimwood, [http://history.nasa.gov/SP-4001/cover.htm Project Mercury - A Chronology]
- Mae Mills Link, [http://www.hq.nasa.gov/office/pao/History/SP-4003/cover.htm Space Medicine In Project Mercury]
- [http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19930074071_1993074071.pdf Results of the first US manned orbital space flight - Feb 20, 1962 (Friendship 7) NASA report - (PDF format)]
- [http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19620004691_1962004691.pdf Results of the second u.s. manned orbital space flight, May 24, 1962 (Aurora 7) NASA report - (PDF format)]
- [http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19990026158_1999028570.pdf This New Ocean: A History of Project Mercury - NASA report (PDF format)]
- [http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19630011968_1963011968.pdf Chronology of Project Mercury - NASA report (PDF format)]
- [http://www-pao.ksc.nasa.gov/kscpao/history/mercury/mercury.htm The Mercury Project (Kennedy Space Center)]
- [http://history.nasa.gov/SP-4001/contents.htm Project Mercury A Chronology (Prepared by James M. Grimwood)]
- [http://history.nasa.gov/SP-4003/cover.htm Space Medicine In Project Mercury By Mae Mills Link]
- [http://www.hq.nasa.gov/office/pao/History/diagrams/mercury.html Project Mercury Drawings and Technical Diagrams]
- [http://www.hq.nasa.gov/office/pao/History/diagrams/diagrams.htm Technical Diagrams and Drawings]
- [http://www.geocities.com/atlas_missile/mercury.htm Mercury-Atlas Diagrams]
- [http://projectmercury5.moonport.org Project Mercury Simulator for the PC (Orbiter)]
- [http://youarego.com Project Mercury Simulator for the Mac]
- [http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19670028606_1967028606.pdf The Mercury Redstone Project (PDF) December 1964]
- [http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19740076527_1974076527.pdf Project Mercury familiarization manual (PDF) November 1961]
- [http://www.ibiblio.org/mscorbit/document.html Various PDFs of historical Mercury documents including familiarization manuals.]
Category:Manned spacecraftCategory:Human spaceflight programmes - ja:マーキュリー計画
Sergeant was an American short-range solid fuelmissile. The Sergeant had a takeoff thrust of 200 kN, a takeoff weight of 4530 kg, a diameter of 790 mm, a length of 10.52 m and a fin span of 1.80 m. It was used as the second stage of the Scout satellite launcher.
External link
http://www.astronautix.com/lvs/sergeant.htm
Stratosphere
:This article is about the atmospheric layer; for the hotel in Las Vegas, see Stratosphere Las Vegas.
The stratosphere is a layer of Earth's atmosphere that is stratified in temperature, with warmer layers higher up and cooler layers farther down. This is in contrast to the troposphere near the Earth's surface, which is cooler higher up and warmer farther down. The stratosphere is situated between about 17 km and 50 km altitude above the surface at moderate latitudes, while at the poles it starts at about 8 km altitude. The stratosphere sits directly above the troposphere and directly below the mesosphere.
The stratosphere is layered in temperature because it is heated from above by absorption of ultraviolet radiation from the Sun. Within this layer, temperature increases as altitude increases; the top of the stratosphere has a temperature of about 270 K, about the same as the ground level temperature. This top is called the stratopause, above which temperature again decreases with height. The vertical stratification, with warmer layers above and cooler layers below, makes the stratosphere dynamically stable: there is no regular convection and associated turbulence in this part of the atmosphere. The heating is caused by an ozone layer that absorbs solar ultraviolet radiation, heating the upper layers of the stratosphere. The base of the stratosphere occurs where heating by conduction from above and heating by convection from below (through the troposphere) balance out; hence, the stratosphere begins at lower altitudes near the poles due to the lower ground temperature there.
Commercial airliners typically cruise at an altitude near 10 km in temperate latitudes, in the lower reaches of the stratosphere. This is to avoid atmospheric turbulence from the convection in the troposphere. Turbulence experienced in the cruise phase of flight is often caused by convective overshoot from the troposphere below. Similarly, most gliderssoar on thermal plumes that rise through the troposphere above warm patches of ground; these plumes end at the base of the stratosphere, setting a limit to how high gliders can fly in most parts of the world. (Some gliders do fly higher, using wave lift from mountain ranges to lift them into the stratosphere).
The stratosphere is a region of intense interactions among radiative, dynamical, and chemical processes, in which horizontal mixing of gaseous components proceeds much more rapidly than vertical mixing.
An interesting feature of stratospheric circulation is the quasi-Biennial Oscillation (QBO) in the tropical latitudes, which is driven by gravity waves that are convectively generated in the troposphere. The QBO induces a secondary circulation that is important for the global stratospheric transport of tracers such as ozone or water vapor.
In northern hemispheric winter, sudden stratospheric warmings can often be observed which are caused by the absorption of Rossby waves in the stratosphere.
North American Aviation, Inc. was an aircraft manufacturer from the 1930s to 1967, when it merged with Rockwell-Standard Corporation to become North American Rockwell Corporation. The company was responsible for a number of historic aircraft, including the T-6 Texan trainer, the P-51 Mustangfighter, the B-25 Mitchellbomber, the F-86 Sabrejet fighter, and the X-15rocket plane, as well as ApolloCommand and Service Module and the second stage of the Saturn Vrocket.
Clement Keys founded North American on December 6, 1928, as a holding company that bought and sold interests in various airlines and aviation-relation companies. However, the Air Mail Act of 1934 forced the breakup of such holding companies. The upshot was that North American became a manufacturing company run by Dutch Kindelberger (who had been recruited from Douglas Aircraft Company), although it retained Eastern Airlines until 1938.
Kindelberger moved the company's operations to southern California, which allowed flying year-round, and decided to focus on training aircraft, on the theory that it would be easier than trying to compete with established companies.
Its first planes were the GA-15 observation plane and the GA-16 trainer, followed by the O-47 and BT-9. The BC-1 of 1937 was NA's first combat aircraft.
Like other manufacturers, North American started gearing up for war in 1940, opening factories in Dallas, Texas and Kansas City, Kansas.
North American's follow-on to the BT-9 was the T-6 Texan trainer, of which 17,000 were built, making it the most widely used trainer ever. The twin-engine B-25 Mitchell bomber achieved fame in the Doolittle Raid and was used in all theaters. Finally, the P-51 Mustang, once powered with a Rolls-Royce Merlin engine, came to be considered the best American fighter of the war.
Post-war, North American's employment dropped from a high of 91,000 to 5,000 in 1946. Nevertheless, it continued with new designs, including the T-28 Trojan trainer and attack aircraft, AJ Savage and A-5 Vigilanteaircraft carrier–based bombers, the odd-looking P-82 Twin Mustang, B-45 Tornado jet bomber, the FJ Fury fighter, XB-70 Valkyrie Mach-3 strategic bomber, Shrike Commander, and the Sabreliner business jet.
The F-86 Sabre started out as a redesigned Fury and achieved fame in the Korean War shooting down MiGs. Over 9,000 F-86s were produced. Its successor, the F-100 Super Sabre, was also popular. In 1965 came the first flight of the very successful OV-10 Bronco, which was one of first aircraft designed specifically for counter-insurgency (COIN) and forward air control (FAC) duties.
The rocket engine division spun off into a separate company Rocketdyne in 1955, but North American designed and built the X-15.
The cancellation of the F-107 and F-108 programs in the late 1950s, as well as the cancellation of the Navaho ballistic missile program, was a blow to North American from which it never fully recovered. In 1960, the new CEO Lee Atwood decided to focus on the space program, and the company was the chief contractor for the Apollo Command/Service Module and the second stage of the Saturn V. However, the Apollo 1 fire in January 1967 was partly blamed on the company, and in March they merged with Rockwell. For a comprehensive history refer to the Aerospace Legacy Foundation based in Downey.
In December 1996, the defense and space divisions of Rockwell International (including the North American Aviation and Rocketdyne divisions) were sold to Boeing, which integrated the product lines into their Integrated Defense Systems division. Rocketdyne eventually sold to UTC Pratt & Whitney, in 2005.
- [http://www.boeing.com/history/bna North American Aviation history]
- [http://www.centennialofflight.gov/essay/Aerospace/NorthAmerican/Aero37.htm Centennial of Flight page on North American]
Category:United States aircraft manufacturersja:ノースアメリカン
This page is an archive of the proposed deletion of the article below. Further comments should be made on the appropriate discussion page (such as the article's talk page or on a Votes for Undeletion nomination). No further edits should be made to this page.
in 1939, is a Haitian-born and U.S. naturalized businessman from Texas. Simeus has returned to Haiti to be a candidate in the first presidential election since the ouster of Jean Bertra
Wikipedia:Votes for deletion/Eltingville Trivia Off
This page is an archive of the proposed deletion of the article below. Further comments should be made on the appropriate discussion page (such as the article's talk page or on a Votes for Undeletion nomination). No further edits should be made to this page.
