Page 50 - Specialised First Foreign Language 2

several balloons with less dense gas From the air, the
balloon was lifted up, and the most used gas at the
beginning was helium and nitrogen, which was considered

dangerous because it is flammable, and hydrogen actually
caused several accidents, such as the Hindenburg disaster.

Scientists were still looking for a safer way to fly using
engines, but most of the inventors of aircraft at that time
were impulsive, so most of these planes crashed
immediately before they rose, and not even their

inventors knew the causes of the crash, but the Wright
brothers were more scientific and methodical.

The Wright brothers began to test their ideas first in small
models before they built the actual plane. They also took
notes on the first models, then developed hypotheses or
guesses, and then carried out more experiments to ensure

the correctness of their hypotheses and this is known as
(the scientific method in Thinking), for example the
Wright brothers constructed an air tunnel to compare the
shapes of a suitable plane wing.

This was by attaching an old store fan to a 6-foot wooden
box, and they blew air into several miniature wing models

with different but accurate measurements, and in the end
they came up with a number of successful measurements
of the plane's wing, and the brothers also made countless
kites as well as gliders. To test the various designs of the
aircraft, they also successfully studied and analyzed the

movements of birds.

50