Both the reading and the lecture discuss about airship which is replaced by the airplane and helicopter. The author explains three advantages of airships; however, the lecturer believes that airships have several demerits which do not let to use them in the future anymore.
First of all, the passage claims that due to the fact that airships use less fuel, it is more economical to use them. Conversely, the speaker illustrates that the airships need special gases such as hydrogen or helium in order to lift. Hydrogen catches fire easily; so, it is dangerous to use it. For example, some accidents are reported in the past that show some airships destroyed due to using hydrogen. Moreover, helium, however it is safe, is a rare gas, and obtaining it is difficult. Therefore, it is too challenging to provide a balance between safety and cost.
Secondly, the text states that airships can transport heavy loads that is a positive point for them against airplanes and helicopters. On the other hand, the professor rejects the claim by saying that airships would be crashed at the time of the loading. To put logs on the airship, it must be steady. However, airships have light weights which does not let them be resistible to windy weather. A slight wind can break the airship balance during the loading of the freights. Therefore, using airships for carrying heavy loads is challenging.
Finally, the text explains that airships can be used as a satellite for carrying essential equipment for telecommunications. Nevertheless, the lecturer refutes it because she believes that the only type of airships which are used in this application, just can go up to 40KM which is not enough. Additionally, if they can go upper, they need to refueled continuously in order to save their balance against the wind. Not only are there no adequate tools that provide continuous fuel for them, but also it is not economical.
Both the reading and the lecture discuss about
airship
which
is replaced
by the airplane and helicopter. The author
explains
three advantages of
airships
;
however
, the lecturer believes that
airships
have several demerits which do not
let
to
use
them in the future anymore.
First of all
, the passage claims that due to the fact that
airships
use
less fuel, it is more economical to
use
them.
Conversely
, the speaker illustrates that the
airships
need special gases such as hydrogen or helium in order to lift. Hydrogen catches fire
easily
;
so
, it is
dangerous
to
use
it.
For example
,
some
accidents
are reported
in the past that
show
some
airships
destroyed
due to using hydrogen.
Moreover
, helium,
however
it is safe, is a rare gas, and obtaining it is difficult.
Therefore
, it is too challenging to provide a balance between safety and cost.
Secondly
, the text states that
airships
can transport heavy loads
that is
a
positive
point for them against airplanes and helicopters.
On the other hand
, the professor rejects the claim by saying that
airships
would
be crashed
at the time of the loading. To put logs on the
airship
, it
must
be steady.
However
,
airships
have light weights which does not
let
them be resistible to windy weather. A slight wind can break the
airship
balance during the loading of the freights.
Therefore
, using
airships
for carrying heavy loads is challenging.
Finally
, the text
explains
that
airships
can be
used
as a satellite for carrying essential equipment for telecommunications.
Nevertheless
, the lecturer refutes it
because
she believes that the
only
type of
airships
which are
used
in this application,
just
can go up to 40KM which is not
enough
.
Additionally
, if they can go upper, they need to refueled
continuously
in order to save their balance against the wind. Not
only
are there no adequate tools that provide continuous fuel for them,
but
also
it is not economical.