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    UAS SilentOne

    Our UAS SilentOne opens the sky for a new kind of autonomous aviation for inspection, surveying & surveillance of large infrastructure. The installed fuel cell enables high range/payload & fast & flexible data-acquisition with heavy sensor systems by using the high energy density of hydrogen. Conventional UASs need to perform several flights for the same data-acquisition. Due to the very low airspeed, enabled by the low wing loading, the system is the perfect tool to use high resolution cameras. Additionally different aerodynamic packages are available to adapt the cruise speed to the mission characteristics.

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    Description

    Features & Technical Data
    The UAS features following general specifications:
    Vertical take-off & landing
    35 kg MTOW
    10 kg maximum payload
    700 km maximum range
    6 h maximum flight time
    Low airspeed below 80 km/h if necessary

    The cargo bay is intended for camera & stabilization (gimbal) used for the line-inspection & can be accessed easily (cargo bay size L × W: 360 mm × 200 mm). The cargo bay offers a payload power supply of up to 120 W. Several high-end cameras including highly stabilized gimbals with howling that are available on the market, fit into the cargo bay of the UAS. Although the cargo bay is designed for medium sized cameras & gimbal, it can be adapted for the transport of goods with a reasonable effort. Also customized solutions can be implemented by our team.

    Unique VTOL Method
    A patent for the new method is already handed in. Because the wings need not to be tilted for VTOL action the UAS can feature a large span-width. This enables a low wing loading with a low airspeed & a large flight envelope. At low airspeed the flight envelope is limited by the aerodynamic stall & at high speed by the structural limit of the airframe. The maximum flight height is determined by the amount of oxygen left in the air, necessary for the efficient operation of the fuel cell.

    Safety Concept/Certification
    In accordance with the EASA regulations (947/2019) in Europe the UAS has a sophisticated safety concept. Finally every safety feature available on the market is installed & the safety concept exceeds the required standards. This approach was chosen to minimize the possibility of an incident.

    Safety features to be implemented:
    High-end Flight Controller with a 10-6/h failure safety rate.
    Energy management system. Special developed self-redundant energy management system providing the power for the UAS electronics even in case of partial failure.
    Self-redundant fuel cell.
    Additional triple redundant systems. Energy sources, C2 link (2 × LTE & satellite), electric engines & control surfaces.
    Different systems for visibility in the air (depending on costumer & mission characteristics). FLARM, ADS-B, U-Space, GPS, Automatic Detect & Avoid (visible or radar).
    Complete rescue system. In case all safety measures fail, the UAV is brought safely to the ground by a parachute.
    The safety measures do not affect the UAS specifications.
    Most secure operation concept for a UAS in its weight category.
    The flight operations of the SilentOne UAS will take place in the category “specific”. No certification of the UAS necessary.

    Fuel Cell Technology
    For the power supply of the UAS during cruise flight a fuel cell is used to take advantage of the high energy density of hydrogen. The latest fuel cell technology is applied to power the electric engines & the onboard electronics of the UAS. This technology features the following advantages:
    Low weight
    Self-redundancy
    High power
    No recharging necessary
    Easy to use

    Besides the high energy density, the operation with hydrogen has additional advantages:
    No emission of greenhouse gases.
    Required amount of Lithium Batteries is minimized.
    Hydrogen can be gained from renewable energy sources.
    Fuel cells do not lose energy in cold environment (down to -5 °C) whereas lithium batteries lose capacity & power beginning already below 20 °C.

    The applied hydrogen tanks are certified & provide high security. Even in case of a fatal crash without parachute the hydrogen will still be enclosed in the hydrogen tank & cannot ignite with an extremely high grade of probability.

    Organization of UAS Operation
    Before regular operations on the site of the customer some preparations have to be performed. The infrastructure for the UAS & hydrogen has to be set up, the staff has to be educated, the operating license has to be obtained from the national aviation authority & so on. At SilentWings we support the customer with all these challenges until the first flight of the UAS & beyond. The service of SilentWings includes supported with documentation, maintenance, service & guidance by our team.

    After gaining an operating license the UAS can be applied for operations. The UAS is mobile & disassembles in single parts. No infrastructure for take-off & landing is necessary. Therefore, the UAS can be used nearly everywhere. After completion of the mission the UAS is refuelled & ready for the next mission within minutes (Batteries for take-off & landing are recharged during flight). No lengthy recharging or change of the battery is necessary.

    Development
    For the serial production of the UAS further improvements on the UAS design are performed:
    Improved aerodynamic design enhanced by CFD.
    Weight reduction.
    Fuselage provides optimized airflow for fuel cell.
    Improved cell durability.
    Work in progress.