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AIRSHIPS - Lighter Than Air
Aeroplane
Airship
Helium
Enclosed volume of Helium provides the aerostatic
lift without any use of additional energy. The
value of lift capacity depends on the enclosed
helium volume.
Every conventional aircraft needs energy to
overcome the dynamic drag which is produced when
the wings have to supply aerodynamic lift.
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AIRSHIPS - Inflated Blimps
Ballonets and ventilators
The enclosed helium volumevaries with the
ambient factors pressure and temperature ? one
or more compensation volume inside the hull
is required ?
ballonets The ballonets are filled with ambient
air by a ventilator system The stiffness of
inflated structures is based on thepressure
inside. The ventilation system provides the
minimum pressure constantly required.
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AIRSHIPS - Inflated Blimps
- empty ballonets- maximum altitude
Ascending flight operation
The percentage of ballonetvolume restricts
themaximum altitude that canbe reached in
mission
- ascending altitude - descending ambient
pressure - descending ambient temperature
The ballonet air is pressedout through valves by
theincreasing helium pressure
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AIRSHIPS - Inflated Blimps
Descending flight operation
The ventilator performance restricts the maximum
descending rate that canbe reached in mission
Ventilators blow air into the ballonets.
- descending altitude - ascending ambient
pressure - ascending ambient temperature
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AIRSHIPS - Wind and Weather
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Dependency on the weather
? The manoeuvrability of the airship is,
depending on number and power of engines,
restricted by the the strength of wind and
gusts ? Precipitation reduces the available lift
and visibility ? The visibility must be good
enough to pilot the ship from ground ? The
temperature range depends on the used hull fabrics
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Ground service
? Depending on the tightness of the hull leaking
helium has to be refilled to provide the lift
and maximum flight altitude ? The ventilator has
to work 24h. A blimp must be pressurized all the
time, even when on ground in the hangar.
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AIRSHIPS - Piloting and control
Payload-platform
? Piloting from ground via two separated
radio link frequencies ? Transmission of system
data to ground station via telemetry -
downlink ? Course-control via GPS and ground
station ? on-board data infrastructure by
CAN-bus ? Transmission of payload-data to ground
via separate data telemetry
On-board data-infrastructure via CAN-bus
Downlink Payload data
Downlink status data
Uplink piloting 2nd frequency
Uplink piloting 1st frequency
Reception of Payload data
Piloting of the airship
Telemetry ground control
Scanner TV-Camera
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