Ducted Fan 'AirMule' UAS Completes First Phase of Flight Testing | Aero-News Network
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Sun, Jan 17, 2010

Ducted Fan 'AirMule' UAS Completes First Phase of Flight Testing

Urban Aeronautics’ Rotorless VTOL Aircraft Demonstrates Hover Capability

The AirMule, a single-engine, VTOL Cargo and MedEvac UAS developed by Israel-based Urban Aeronautics, has successfully completed the first phase of its flight testing. This phase has consisted of tethered autonomous hovers with the vehicle’s Fly-By-Wire control system providing the necessary auto-stabilization in all three rotational axes of the vehicle ... pitch, roll and yaw.

Control of the vehicle is accomplished through a company developed, four channel, redundant flight control system that relies almost entirely on inertial measurements augmented by GPS for translational position and velocity readings. Height above ground is measured by two laser altimeters. 460 channels of telemetry provide real-time data to the ground based operators, enabling them to monitor the correct operation of the Turbomeca Arriel1 730 horsepower turbo-shaft engine as well as sub-systems.  These include the three company developed gearboxes, the two main lift rotors with their hydraulic pitch change mechanism and three uplink and downlink communication channels.

Results from the tests have confirmed the company’s predictions regarding power required for hover. The present hover height of approximately 2 feet is just outside of ground effect for this particular configuration. The aircraft uses a system of vanes for yaw and roll control, and in the test demonstrated the vehicle’s ability to perform hover with very high precision in gusty wind conditions (currently estimated and confirmed by the recent hover tests at 50 knots for the fully developed product).

Based on the success of these initial hover tests the vehicle is now being readied for the next phase which will include vehicle position stabilization in X,Y and height above ground.  During this upcoming phase the safety wires that are now connected to the tarmac will be removed.

FMI: www.urbanaero.com 

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