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Lab of Janus
energy waste and environmental pollution. Various
whenthinkingofelectriccars.Justaselectriccarsgoto
forms of eco-friendly mobility such as electric and
charging stations only for electric vehicles and put the
hydrogenelectricvehicleshavealreadyemergedtosolve
plug in to charge them, the eVTOL is also a method of
the global warming problem caused by greenhouse gas
chargingintheformofplugsatstations.”
emissions, but the future revolution of mobility is now
The background in which eVTOL can be used for
headingoffofthegroundandintothesky.
UAM is to improve battery performance. Hwang Ho-
yon, a professor at Sejong University’s Department
Both airplanes and helicopters, which are existing
of Aerospace Engineering said, “In the past, batteries
means of transportation, use internal combustion
could not be used in transportations because it was
engines.Therefore,theycannotbeusedasfuturemeans
impossible to fly only with them. However, now, the
of transportation due to their high carbon emissions.
specific energy, which indicates how much electrical
What then is the principle whereby an internal
energy can be stored in the battery weight, has risen to
combustion engine emits a large amount of carbon?
more than 500Wh/kg,* enabling a 30-minute flight.”
An internal combustion engine basically operates by
The commercialization of the UAM requires the
burning fossil fuels. And fossil fuels used at this time
specific energy of 400Wh/kg or more in a battery. The
are generated by burying a body of living things made
development of the battery technology that sufficiently
of carbon in the ground. Therefore, when fossil fuels
surpasses this requirement allows the expansion of
are dug up and burned, the density of carbon dioxide
UAMoperatingtime.
in the atmosphere increases because carbon trapped
in the ground is released into the air. Carbon dioxide
*Wh:The watt-hour (symbolized Wh) is a unit of energy equivalent to one
generated in this way causes a greenhouse effect and
watt(1W)ofpowerexpendedforonehour(1h)oftime.
climatechange.
MorePropellersthanHelicopters,
theDistributedPropulsion
Inordertosolvethisproblem,whatisbeingdeveloped
to reduce carbon emissions as much as possible is
The reason why the UAM is suitable for urban areas
the “electric vertical take-off and landing (eVTOL).”
is that it applies distributed propulsion technology that
In other words, it is a flying electric vehicle that can
fliesusingmultipleengines.Itwillbeeasytounderstand
take off and land vertically like a helicopter while
consideringthatthedronehasseveralpropellers.Inthis
using electricity. The eVTOL does not emit pollutants
way, if multiple propellers are attached to promote the
because it obtains electric power through batteries
distributed propulsion, a stable landing can be ensured
instead of internal combustion engines. Jo Yeong-
becausetheflightcanbecontinuedevenifonepropeller
min, an assistant professor at Hanseo University’s
fails. Yee Kwan-jung, a professor at Seoul National
Department of Unmanned Aircraft Systems, explained
University’s Department of Aerospace Engineering
about the eVTOL as follows. “It is easy to understand
explainedthesafetyofdistributedpropulsionasfollows.
News
Group
Crew
Motor
ⓒAero
ⓒHyundai
▲Manycompaniescooperateontheresearchofoperationalmodels
▲Distrubitedpropulsionoperatesmultipleindependentrotors.Even
forcharginginfrastructuresolutionsneededforeVOLTaircraftto
ifonerotorfails,thevehiclestillfliessafelyastheotherscontinue
beginoperations.
torun.
19
APRIL 2022
energy waste and environmental pollution. Various
whenthinkingofelectriccars.Justaselectriccarsgoto
forms of eco-friendly mobility such as electric and
charging stations only for electric vehicles and put the
hydrogenelectricvehicleshavealreadyemergedtosolve
plug in to charge them, the eVTOL is also a method of
the global warming problem caused by greenhouse gas
chargingintheformofplugsatstations.”
emissions, but the future revolution of mobility is now
The background in which eVTOL can be used for
headingoffofthegroundandintothesky.
UAM is to improve battery performance. Hwang Ho-
yon, a professor at Sejong University’s Department
Both airplanes and helicopters, which are existing
of Aerospace Engineering said, “In the past, batteries
means of transportation, use internal combustion
could not be used in transportations because it was
engines.Therefore,theycannotbeusedasfuturemeans
impossible to fly only with them. However, now, the
of transportation due to their high carbon emissions.
specific energy, which indicates how much electrical
What then is the principle whereby an internal
energy can be stored in the battery weight, has risen to
combustion engine emits a large amount of carbon?
more than 500Wh/kg,* enabling a 30-minute flight.”
An internal combustion engine basically operates by
The commercialization of the UAM requires the
burning fossil fuels. And fossil fuels used at this time
specific energy of 400Wh/kg or more in a battery. The
are generated by burying a body of living things made
development of the battery technology that sufficiently
of carbon in the ground. Therefore, when fossil fuels
surpasses this requirement allows the expansion of
are dug up and burned, the density of carbon dioxide
UAMoperatingtime.
in the atmosphere increases because carbon trapped
in the ground is released into the air. Carbon dioxide
*Wh:The watt-hour (symbolized Wh) is a unit of energy equivalent to one
generated in this way causes a greenhouse effect and
watt(1W)ofpowerexpendedforonehour(1h)oftime.
climatechange.
MorePropellersthanHelicopters,
theDistributedPropulsion
Inordertosolvethisproblem,whatisbeingdeveloped
to reduce carbon emissions as much as possible is
The reason why the UAM is suitable for urban areas
the “electric vertical take-off and landing (eVTOL).”
is that it applies distributed propulsion technology that
In other words, it is a flying electric vehicle that can
fliesusingmultipleengines.Itwillbeeasytounderstand
take off and land vertically like a helicopter while
consideringthatthedronehasseveralpropellers.Inthis
using electricity. The eVTOL does not emit pollutants
way, if multiple propellers are attached to promote the
because it obtains electric power through batteries
distributed propulsion, a stable landing can be ensured
instead of internal combustion engines. Jo Yeong-
becausetheflightcanbecontinuedevenifonepropeller
min, an assistant professor at Hanseo University’s
fails. Yee Kwan-jung, a professor at Seoul National
Department of Unmanned Aircraft Systems, explained
University’s Department of Aerospace Engineering
about the eVTOL as follows. “It is easy to understand
explainedthesafetyofdistributedpropulsionasfollows.
News
Group
Crew
Motor
ⓒAero
ⓒHyundai
▲Manycompaniescooperateontheresearchofoperationalmodels
▲Distrubitedpropulsionoperatesmultipleindependentrotors.Even
forcharginginfrastructuresolutionsneededforeVOLTaircraftto
ifonerotorfails,thevehiclestillfliessafelyastheotherscontinue
beginoperations.
torun.
19
APRIL 2022
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