Orbitador

Orbitador
Tipo
avião espacial
crewed spacecraft (d)
reusable spacecraft (en)
ônibus espacial (d)
modelo de veículo (d)
Características
Altura
17,25 m
Comprimento
37,2 m
Envergadura
23,8 m
Pesos
74 844 kg
Composto de
Concepção
País de origem
Fabricação
Fabricante
Origem
Retenção
Proprietário
Proprietário

Orbitador é uma nave espacial orbital reutilizável do programa do ônibus espacial da NASA, a agência espacial dos Estados Unidos. Com asas e impulsionada por foguetes, a nave pode transportar tripulantes e carga à órbita terrestre, realizar operações orbitais e reentrar na atmosfera, planando até o pouso.[1]

Além da carga e da tripulação, a nave também transporta a maioria do seu sistema de propulsão, mas o combustível propelente dos três motores principais é bombeado de um grande tanque externo não-reutilizável além de dois tanques menores reutilizáveis, que formam o conjunto do ônibus espacial em seus primeiros minutos ascendentes após o lançamento.

Seis destes orbitadores foram construídos para o programa do ônibus espacial nos anos 1980 e 1990: Columbia, Challenger, Discovery, Atlantis e Endeavour, com pequenas diferenças entre eles e os mais novos tendendo a ser um pouco mais leves. Os dois primeiros foram perdidos em acidentes em 1986 e 2003. Os três últimos continuaram em operação e foram aposentados em 2011, quando foram substituídos pela nova geração de naves Orion.[carece de fontes?]

Sua estrutura é feita basicamente de ligas metálicas de alumínio, enquanto a estrutura do motor é feita de titânio. A parte externa da nave é coberta por um escudo antitermal feito de cerâmica, capaz de resistir a temperaturas tão extremas quando os -121 ºC do espaço aos 3 000 ºC da reentrada.[2]

Ver também

Referências

  1. «Facts About the Space Shuttles». NASA 
  2. «HSF – The Shuttle». Spaceflight.nasa.gov. Consultado em 17 de julho de 2009 

Ligações externas

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