  Interstellar transport is an object of interest in many sci-fi stories. In
history a lot of sci-fi predictions have turned into reality, such as
communications satellites, deep-sea submarines and journies to the moon. In
this work we study some physical parameters of a space ship which uses a
magnetic umbrella. Our spaceship generates a magnetic field in its neighborhood
and captures charged protons into a magnetic trap. These particles are taken
into a fusion reactor. The obtained energy and waste in form of helium are used
as a fuel in an ion engine. With the help of elementary physics we can work out
the basic physical parameters of the ship, e.g. maximal velocity, acceleration
of the ship or acceleration time period.
