For a real example, though not for manned flight, check out Orbital's Pegasus: http://en.wikipedia.org/wiki/Pegasus_(rocket) http://en.wikipedia.org/wiki/Pegas

For a real example, though not for manned flight, check out Orbital's Pegasus: http://en.wikipedia.org/wiki/Pegasus_(rocket) http://en.wikipedia.org/wiki/Pegasus_(rocket)