A． Right B． Wrong C． Not mentionedA rescue platform cal……
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Rescue Platform In the aftermath of the
terrorist attacks on the World Trade Center, security experts are trying to
develop new ways of rescuing people from burning skyscrapers. One idea is a
platform capable of flying vertically and hovering in the air like a helicopter.
The platform would rise up and down alongside a skyscraper and pick up
people trapped in high stories. The idea for the vertical
takeoff platform was hatched more than ten years ago by a Russian aerospace
engineer, David Metreveli, who has since moved to Israel. Metreveli’s design,
called the Eagle, calls for two jet engines that turn four large horizontal
propellers. The spinning of the propellers generates the necessary lift, or
upward force, to raise the platform. The more power is supplied to the
propellers, the higher the platform rises. Moving the platform sideways involves
applying differing amounts of power to each propeller.
Helicopters are now used in some cases to get people out of burning
buildings. Escape baskets slung from them dangle beside the building for people
to climb into. Unfortunately, the baskets cannot reach every floor of a building
because the ropes from which they hang become unstable beyond a certain
length. So far, Metreveli has built a small-scale model of the
Eagle to test his idea. In the wake of September 11, he has been able to secure
enough funding to start building a larger, 4-meter by 4- meter prototype, which
he calls the Eaglet.
A rescue platform called the Eagle is capable of moving vertically but not sideways.
