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Project 3: Design and Analysis of a Compound Helicopter for High Speed Flight

Summary of Services Performed:  Use ART modeling and analysis tools RCAS and FLIGHTLAB to design and simulate a compound helicopter that uses a variable speed rotor for efficient autorotative lift in high speed forward flight

ART was awarded a subcontract to support the design and analysis of a compound helicopter named Heliplane. The configuration used a rotor with tip-jets to fly as a helicopter in hover and low speed forward flight and as a fixed-wing aircraft with the rotor in auto-rotative mode in high speed (up to 400 mph). In such a configuration, the rotor would experience an advance ratio of up to 2.7. ART created two models for this configuration:  one in RCAS for engineering analysis and the other in FLIGHTLAB for flight dynamic analysis.  Since the trim for this compound helicopter was not unique, ART developed a new trim algorithm for the entire flight envelope. In addition, a preliminary RPM control system was designed and implemented for the high advance ratio auto-rotative condition.

Project 4: HeliFlight-R

Summary of Services Performed: Develop a reconfigurable simulator to support engineering applications

ART has developed HeliFlight-R, a reconfigurable simulator that can be coupled with FLIGHTLAB flight dynamics models to support pilot-in-the-loop engineering analysis. The initial system was purchased by the U.S. Navy at Patuxent River, MD to support planning of shipboard landing tests. The HeliFlight-R system is being delivered with two different flight dynamics models and cockpit configurations; the SH-60 and the V-22. The Navy will use it to simulate planned ship/helicopter trials to make the most efficient use of available flight test time. A second HeliFlight–R system is being developed for a major Aerospace University and will be used to support Handling Qualities evaluation of new European aircraft such as the European tilt rotor.

HeliFlight-R includes a 12 ft. diameter dome with three SXGA projectors capable of rendering a 210 x 60 degree field of view. A set of four axis control loaders are used to provide the aircraft-specific control feel characteristics and LCD displays are used to display computer generated instruments and MultiFunction displays for the reconfigurable cockpit. The system for the U.S. Navy will include a Quantum3D Image Generator with a dynamic sea state and an LHA ship display for shipboard landing work.

Project 5: Aeroelastic Modeling of a Long Endurance Fixed Wing UAV

Summary of Services Performed: Use ART modeling and analysis tool RCAS to design and simulate a Long Endurance Fixed Wing UAV

ART was awarded a contract to support the development of an aeroelastic model for a long endurance fixed-wing UAV. In this project RCAS was extended to compute wing airloads as a function of angle of attack and Reynolds number as opposed to angle of attack and Mach number.  Wing vortex wake, Von Karman/Dryden gust models and nonlinear unsteady Leishman-Beddos airloads option for wing flaps, aileron and tail elevator were also added. This

Advanced Rotorcraft Technology, Inc.

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