Ancora: Anotec-Comoti Rotorcraft Acoustics Initiative for Preliminary Acoustic Flight Tests for the Tuning of Simplified Rotorcraft Noise Models

41st European Rotorcraft

Forum 2015

Munich, Germany 1-4 September 2015

Volume 1 of 2

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Curran Associates, Inc. 57 Morehouse Lane Red Hook, NY 12571 USA Phone: 845-758-0400 Fax: 845-758-2633 Email: [email protected] Web: www.proceedings.com TABLE OF CONTENTS

VOLUME 1

ACOUSTICS

ANCORA: ANOTEC-COMOTI ROTORCRAFT ACOUSTICS INITIATIVE FOR PRELIMINARY ACOUSTIC FLIGHT TESTS FOR THE TUNING OF SIMPLIFIED ROTORCRAFT NOISE MODELS...... 1 N. Van Oosten, L. Dragasanu, F. Cenedese

DESIGN, ANALYSIS AND PROTOTYPING OF ACTIVE TAB ROTOR ...... 7 N. Kobiki, Y. Tanabe, T. Aoyama, D.-H. Kim, H. J. Kang, S.-Y. Wie, S.-H. Kim

MAIN ROTOR AEROACOUSTIC ANALYSIS AND VALIDATION WITH TEST DATA AND FAVORABLE PLANFORM DESIGN FOR MINIMAL AERODYNAMIC NOISE...... 20 A. Yucekayali, M. Senipek, Y. Ortakaya

UNCERTAINTY QUANTIFICATION OF NOISE ABATEMENT FLIGHT PROCEDURES ...... 32 W. F. J. Olsman

AERODYNAMICS

A SIMPLE ANALYTICAL FUSELAGE-INDUCED VELOCITY MODEL FOR COMPREHENSIVE ROTOR CODES ...... 46 B. G. Van Der Wall, M. Wentrup, G. Rajagopalan, S. N. Jung

AEROACOUSTIC SIMULATION OF A COMPLETE H145 HELICOPTER IN DESCENT FLIGHT ...... 65 U. Kowarsch, C. Oehrle, M. Keßler, E. Krämer

AERODYNAMIC ANALYSIS OF HELICOPTER SIDE INTAKE VARIANTS BY FULL SCALE WIND TUNNEL MEASUREMENTS ...... 81 F. Knoth, J. H. You, C. Breitsamter

AERODYNAMIC RESULTS FROM THE STAR HOVER TEST: AN EXAMINATION OF ACTIVE TWIST ACTUATION...... 92 A. Bauknecht, B. Ewers, O. Schneider, M. Raffel

AERODYNAMIC VALIDATION OF RFLOW3D CODE WITH UH-60A DATA INCLUDING HIGH ADVANCE RATIOS ...... 108 Y. Tanabe, H. Sugawara

ANALYSIS OF HOVER/HOVERING TURN OF A COMPLETE HELICOPTER CONFIGURATION USING A COUPLED AERODYNAMICS-FLIGHT DYNAMICS SOLVER ...... 117 S. H. Park, Y. B. Chu, S. H. Park, D.-H. Seo, D. J. Lee

APPLICATION OF A CFD AND PRESCRIBED WAKE MODEL TO HIGH ADVANCE RATIO WIND TUNNEL TEST VALIDATION ...... 132 M. Sugiura, Y. Tanabe, H. Sugawara, I. Chopra

APPLYING MULTI-OBJECTIVE VARIABLE-FIDELITY OPTIMIZATION TECHNIQUES TO INDUSTRIAL SCALE ROTORS: BLADE DESIGNS FOR CLEANSKY...... 142 G. Wilke

CFD-SIMULATION OF THREE-DIMENSIONAL DYNAMIC STALL ON A ROTOR WITH CYCLIC PITCH CONTROL...... 156 J. Letzgus, M. Keßler, E. Krämer

COMPARISON BETWEEN DIFFERENT GRID METHODOLOGIES FOR ROTORCRAFT CONFIGURATIONS ...... 168 M. A. Woodgate, G. N. Barakos

DYNAMIC STALL SIMULATIONS WITH FINITE-VOLUME BASED LATTICE BOLTZMANN METHOD...... 183 G. Guzel, B. Yagiz, A. E. Cetiner

EFFECT OF ACTIVE GURNEY FLAPS ON OVERALL HELICOPTER FLIGHT ENVELOPE ...... 197 V. Pastrikakis, R. Steijl, G. N. Barakos

ERICA TILTROTOR AIRFRAME WAKE CHARACTERIZATION ...... 227 F. De Gregorio, D. Steiling, E. Benini, R. Ponza

FINITE-STATE DYNAMIC WAKE INFLOW MODELLING FOR COAXIAL ROTORS...... 238 F. Cardito, R. Gori, G. Bernardini, J. Serafini, M. Gennaretti

IMPROVED TURBULENCE AND TRANSITION CLOSURES FOR SEPARATED FLOWS ...... 252 J. Hodara, M. J. Smith

NUMERICAL MODELLING OF THE AERODYNAMIC INTERFERENCE BETWEEN HELICOPTER AND GROUND OBSTACLES...... 269 G. Chirico, L. Vigevano, G. N. Barakos

NUMERICAL SIMULATION OF THE ERICA TILTROTOR USING THE HMB2 SOLVER ...... 288 A. Jimenez Garcia, G. N. Barakos

OPTIMISATION OF DUCTED FANS WITH CFD ...... 303 M. Biava, M. Carrion, R. Steijl, G. N. Barakos, D. Stewart

PITCHING AIRFOIL SUBJECTED TO HIGH AMPLITUDE FREE STREAM OSCILLATIONS...... 315 C. Strangfeld, H. F. Müller-Vahl, D. Greenblatt, B. G. Van Der Wall, C. N. Nayeri, C. O. Paschereit

PROPELLER ANALYSIS USING A HYBRID NAVIER-STOKES/FREE-WAKE METHOD...... 326 B.-Y. Min, B. E. Wake, P. O. Bowles, C. G. Matalanis, B. Moffitt

ROTORCRAFT APPLICATIONS OF ACTIVE GURNEY FLAP INVESTIGATED WITHIN THE CLEAN-SKY PROJECT COMROTAG ...... 336 W. Stalewski

SPANWISE DIFFERENCES IN STATIC AND DYNAMIC STALL ON A PITCHING ROTOR BLADE TIP MODEL...... 349 C. B. Merz, C. C. Wolf, K. Richter, K. Kaufmann, A. Mielke, M. Raffel

THE CLEAN SKY 'CARD' PROJECT: WIND TUNNEL MEASUREMENTS OF A MODEL HELICOPTER ROTOR AND FUSELAGE DRAG...... 363 R. B. Green, M. Giuni, J. Cervinka, D. Zacho, P. Austin, S. Smith, D. Desvigne, D. Alfano

TIME-AND-SPATIALLY ADAPTING SIMULATIONS FOR EFFICIENT DYNAMIC STALL PREDICTIONS ...... 380 M. J. Smith, R. Jain, A. Grubb, K. Jacobson

UNSTEADY ACTUATING BLADE MODEL FOR CFD/CSD ANALYSIS OF A TILTROTOR...... 395 M. Valentini, G. Droandi, P. Masarati, G. Quaranta

UNSTEADY BOUNDARY LAYER TRANSITION ON THE DSA-9A ROTOR BLADE AIRFOIL ...... 411 K. Richter, S. Koch, A. Goerttler, B. Lütke, C. C. Wolf, A. Benkel

WIND TUNNEL MEASUREMENTS OF A CUBOID EXTERNAL LOAD MODEL ...... 428 N. Bier

AIRCRAFT DESIGN

AERODYNAMIC SHAPE OPTIMIZATION OF TILTROTOR BLADES EQUIPPED WITH CONTINUOUS MORPHING AEROFOILS ...... 439 A. Pagano

BEYOND CLEAN SKY: CARTERCOPTER SLOWED ROTOR / COMPOUND EXCEEDS EFFICIENCY AND EMISSION GOALS ...... 451 J. Carter, J. R. Lewis

BLUECOPTER DEMONSTRATOR - AN APPROACH TO ECO-EFFICIENT HELICOPTER DESIGN...... 461 M. Bebesel, A. Dalascio, S. Schneider, S. Günther, F. Vogel, C. Wehle, D. Schimke

EVALUATION OF AN UNSTEADY PANEL METHOD FOR THE PREDICTION OF ROTOR- ROTOR AND ROTOR-BODY INTERACTIONS IN PRELIMINARY DESIGN...... 473 P. Kunze

FLIGHT SIMULATION OF A SWASHPLATELESS HELICOPTER USING ROTOR RPM VARIATION AND MOVABLE CG...... 486 J. Krishnamurthi, A. Gandhi

NUMERICAL ADAPTATION OF A ROTATING BLADE IN HOVER TO AN EQUIVALENT FIXED-WING LAYOUT...... 508 A. Joulain, D. Desvigne, D. Alfano, T. Leweke

NUMERICAL VS. EXPERIMENTAL ASSESSMENT OF OPTIMIZATION EFFECTS ON AERODYNAMIC PERFORMANCE OF ERICA TILTROTOR FUSELAGE ...... 523 E. Benini, R. Ponza, D. Steiling

THE EVOLUTION OF AIRBUS HELICOPTERS CRASHWORTHY COMPOSITE AIRFRAMES FOR TRANSPORT HELICOPTERS...... 531 A. Engleder, J. Markmiller, R. Müller

VALUE-DRIVEN ROTORCRAFT DESIGN THROUGH INTEGRATED PRODUCT/PROCESS DEVELOPMENT AND ROBUST DESIGN SIMULATION ...... 539 D. P. Schrage

AIRCRACT SYSTEMS, AVIONICS AND SENSORS

AMPLIFIED EGO MOTION DRIFT INDICATION FOR HELICOPTER LANDING...... 552 S. Schmerwitz, P. M. Knabl, T. Lueken, H.-U. Doehler

DYNAMIC LANDING SITE RANKING FOR HELICOPTER EMERGENCY SITUATIONS...... 560 M. Zimmermann, N. Peinecke

HELICOPTER ROTORSTRIKE ALERTING SYSTEM...... 572 T. Waanders, R. Scheiblhofer, Q. Qian, B. Van Noort, V. Ziegler, F. Schubert, R. Koerber

VIRTUAL COCKPIT INSTRUMENTATION USING HELMET MOUNTED DISPLAY TECHNOLOGY ...... 582 T. Lueken, J. M. Ernst, H.-U. Doehler

CREW STATION AND HUMAN FACTORS

A DETAILED BIOMECHANICAL PILOT MODEL FOR MULTI-AXIS INVOLUNTARY ROTORCRAFT-PILOT COUPLINGS...... 591 P. Masarati, G. Quaranta, A. Zanoni

ANALYZING VISUAL CLUTTER OF 3D-CONFORMAL HMD SOLUTIONS FOR ROTORCRAFT PILOTS IN DEGRADED VISUAL ENVIRONMENT...... 602 F. Viertler, C. Krammer, M. Hajek

EFFECTS OF ON BOARD TABLET USE DURING HELICOPTER OPERATIONS ...... 616 C. Roos, A. J. C. De Reus

DYNAMICS

ACTIVE VIBRATION CONTROL USING CIRCULAR FORCE GENERATORS...... 627 D. Swanson, P. Black, V. Girondin, P. Bachmeyer, M. Jolly

ANALYSIS OF HIGH-FIDELITY REDUCED-ORDER LINEARIZED TIME-INVARIANT HELICOPTER MODELS FOR INTEGRATED FLIGHT AND ON-BLADE CONTROL APPLICATIONS...... 638 A. K. Padthe, P. P. Friedmann, M. Lopez, J. V. R. Prasad

BLUE PULSE: ACTIVE ROTOR CONTROL BY TRAILING EDGE FLAPS AT AIRBUS HELICOPTERS ...... 659 O. Dieterich, A. Rabourdin, J.-B. Maurice, P. Konstanzer

COMPUTATIONAL STUDIES OF DIFFERENT TAIL ROTORS CHARACTERISTICS UNDER - SPONTANEOUS- ROTATION OF HELICOPTER...... 672 V. S. Krymsky, V. A. Animitsa, V. A. Leontiev

COPING WITH FLAP AND ACTUATOR DRIVING CONSTRAINTS IN ACTIVE ROTOR APPLICATIONS FOR VIBRATION REDUCTION...... 680 R. M. Morales, M. C. Turner

IMPLEMENTATION AND TEST OF A SEMI-CLOSED LOOP HHC-ALGORITHM WITH THE DLR'S MULTIPLE SWASHPLATE SYSTEM...... 691 P. Kuefmann, C. Brillante

INFLUENCE OF INFLOW STATES OF DYNAMIC WAKE MODEL ON TRIM, ROTOR LOADS AND CONTROL RESPONSE OF A HELICOPTER IN FORWARD FLIGHT ...... 703 V. Lokeswara Rao, M. Rohin Kumar, C. Venkatesan

INVESTIGATION OF THE UNSTEADY REVERSE FLOW AIRLOADS AT HIGH ADVANCE RATIOS...... 719 G. Bowen-Davies, I. Chopra

VOLUME 2

LEAD-LAG DYNAMICS OF A ROTOR WITH STICK-SLIP NONLINEARITY...... 732 P. Andersch, M. Hajek

NOVEL L-SHAPED GURNEY FLAP FOR ROTORCRAFT VIBRATION REDUCTION ...... 746 V. Motta, G. Quaranta

OPTIMAL ACTIVE TWIST INPUT SCENARIO FOR ROTOR PERFORMANCE IMPROVEMENT AND VIBRATION REDUCTION ...... 765 Y. H. You, M. K. Dhadwal, S. N. Jung

ENGINES AND PROPULSION

CONCEPTUAL DESIGN AND OPTIMISATION OF AN ADVANCED ROTORCRAFT POWERPLANT ARCHITECTURE ...... 780 F. Ali, K. Tzanidakis, I. Goulos, V. Pachidis, R. Dippolito

INCREASE OF HELICOPTER GEARBOX PERFORMANCE BY USE OF INNOVATIVE TECHNOLOGIES...... 797 J. Litzba

ON-BOARD MONITORING OF FUEL PROPERTIES...... 810 L. Lollini

STATE OF THE ART OF HELICOPTER HYBRID PROPULSION ...... 816 C. Mercier, M. Gazzino, M. Mugnier

THE TDR HELICOPTER CONCEPT: DESIGN AND INTEGRATION OF THE LJUNGSTRÖM TURBINE...... 822 F. Buysschaert, S. Newman, S. Walker, P. Hendrick, H. Antoine

FLIGHT MECHANICS

ACT/FHS SYSTEM IDENTIFICATION INCLUDING ENGINE TORQUE AND MAIN ROTOR SPEED USING THE PBSIDOPT METHOD...... 837 J. Wartmann

ANALYSIS OF A FINITE STATE COAXIAL ROTOR INFLOW MODEL...... 850 Y.-B. Kong, J. V. R. Prasad, C. He

AUTONOMOUS SHIP APPROACH AND LANDING USING DYNAMIC INVERSION CONTROL WITH DECK MOTION PREDICTION ...... 864 J. F. Horn, J. Yang, C. He, D. Lee, J. K. Tritschler

CFD-BASED SIMULATION OF HELICOPTER IN SHIPBORNE ENVIRONMENT...... 878 C. Crozon, R. Steijl, G. N. Barakos

COMPARING THE FLIGHT DYNAMICS CHARACTERISTICS OF TANDEM AND CONVENTIONAL HELICOPTERS FOR THE PURPOSES OF AUTOMATIC CONTROL...... 918 K. Ferguson, D. Thomson, D. Anderson, M. Ireland, Z. Tu, S. Manso, A. Chandran, Gokhan Ibal

COMPREHENSIVE MODEL FOR ROTARY WING UNMANNED AERIAL VEHICLE...... 929 F. E. Olcer

EFFECTS OF ROTOR CONTAMINATION ON GYROPLANE FLIGHT PERFORMANCE ...... 938 H. Duda, F. Sachs, J. Seewald, C.-H. Rohardt

FLIGHT SIMULATION AND CONTROL OF A HELICOPTER UNDERGOING ROTOR SPAN MORPHING ...... 948 J. Krishnamurthi, F. Gandhi

FORMATION CONTROL OF A ROTORCRAFT MULTI-LIFT SYSTEM ...... 980 J. Enciu, J. F. Horn, J. W. Langelaan

LINEAR TIME INVARIANT APPROXIMATIONS OF LINEAR TIME PERIODIC SYSTEMS...... 1000 M. Lopez, J. V. R. Prasad

PREDICTION AND SIMULATOR VERIFICATION OF STATE-SPACE ROTOR MODELLING OF HELICOPTER MANOEUVRING FLIGHT...... 1015 R. Gori, M. Gennaretti, M. D. Pavel, O. Stroosma, I. Miletovic

ROTOR STATE FEEDBACK IN ROTORCRAFT ATTITUDE CONTROL...... 1024 S. Panza, M. Lovera, M. Bergamasco, L. Vigano

ROTROCRAFT FLIGHT DYNAMICS MODEL IDENTIFICATION RESEARCH AT NUAA ...... 1038 W. Wei, C. Renliang

TRIMMING A HIGH-FIDELITY MULTIBODY HELICOPTER MODEL FOR PERFORMANCE AND CONTROL ANALYSIS ...... 1050 L. Trainell, A. Croce, C. E. D. Riboldi, R. Possamai

UNCERTAINTIES IN MODELING HELICOPTER DYNAMICS: A FRAMEWORK APPLIED TO SYSTEM IDENTIFICATION RESULTS...... 1062 S. Greiser

GREEN ROTORCRAFT

A TEST RIG TO ASSESS THE EFFECTIVENESS OF DRAG REDUCTION DEVICES ON A HEAVY-CLASS HELICOPTER ...... 1076 G. Gibertini, F. Auteri, G. Campanardi, G. Droandi, D. Grassi, A. Le Pape, A. Zanotti

A WIRELESS NETWORK OF ACOUSTIC MULTI MISSION SENSORS TO DETECT, LOCATE AND TRACK SIMULTANEOUSLY VARIOUS HELICOPTERS...... 1087 D.-P. Cabo, H.-E. De Bree, M.-A. Sobreira Seoane, G. Carrilo Pousa

ACOUSTIC PREDICTION OF HELICOPTER UNSTEADY MANOEUVRES...... 1100 M. Gennaretti, G. Bernardini, J. Serafini, L. Trainelli, A. Rolando, A. Scandroglio, L. Riviello, E. Paolone

AN ADJOINT BASED GRADIENT OPTIMIZATION CHAIN FOR COMPLEX HELICOPTER FUSELAGE PARTS USING A FREE FORM DEFORMATION OR CAD BASED PARAMETERIZATION METHOD ...... 1112 M. Wentrup

CLEANSKY GRC4: LIGHT HELICOPTER DEMONSTRATOR WITH HIGH COMPRESSION ENGINE ...... 1135 A. Gierczynski

CLEANSKY GREEN ROTORCRAFT NOISE AND EMISSIONS BENEFITS - MAXIMIZING THE IMPACT OF NEW TECHNOLOGIES...... 1143 J. Stevens, C. Smith, V. Pachidis, L. Thevenot, R. Dippolito

ELECTRICAL MACHINE TECHNOLOGIES FOR AN ELECTRIC TAIL ROTOR DRIVE...... 1159 P. H. Mellor, J. Yon, S. Williamson, J. Farman, J. D. Booker, M. Barber, K. Stickels, P. Brinson

IN-FLIGHT VALIDATION OF ROTORCRAFT EMISSION PREDICTIONS AND LOW- POLLUTANT MISSION ...... 1167 A. Frassoldati, A. Cuoci, T. Faravelli, A. Ferrante, M. Stachurska, M. Redaelli, L. Riviello

MEASUREMENT OF THE ROTOR BLADE SECTION AERODYNAMIC COEFFICIENTS BY PARTICLE IMAGE VELOCIMETRY ...... 1181 A. Zanotti, G. Gibertini, F. Auteri, G. Campanardi, G. Droandi, D. Grassi, G. Crosta

OBSERVING THE ANGLE OF ATTACK OF THE TIP-PATH PLANE FROM ROTOR BLADE MEASUREMENTS ...... 1190 L. Trainelli, C. E. D. Riboldi, M. Bucari

OPTIMIZED ERICA ENGINE INTAKE WIND TUNNEL TEST ...... 1202 G. Gibertini, F. Auteri, L. Colaiuda, M. Ermacora, D. Grassi, A. Zanotti

PARAMETRIC OPTIMIZATION OF A FLEXURE-BASED ACTIVE GURNEY FLAP MECHANISM FOR MINIMUM STRESS ...... 1210 J. Freire Gomez, J. D. Booker, P. H. Mellor

PROJECT MANOEUVRES - TOWARDS REAL-TIME NOISE MONITORING AND ENHANCED ROTORCRAFT HANDLING BASED ON ROTOR STATE MEASUREMENTS...... 1220 L. Trainelli, M. Lovera, A. Rolando, E. Zappa, M. Gennaretti, P. Cordisco, R. Grassetti, M. Redaelli

THE PILOT ACOUSTIC INDICATOR: A NOVEL COCKPIT INSTRUMENT FOR THE GREENER HELICOPTER PILOT...... 1228 A. Rolando, F. Rossi, C. E. D. Riboldi, L. Trainelli, R. Grassetti, D. Leonello, M. Redaelli

OPERATIONAL ASPECTS

IN SERVICE EXPERIENCE, REPAIR AND EVOLUTION OF EC135 M/R BLADE TOWARDS THE DMC BENCHMARK...... 1242 M. Zellhuber, G. Kuntze-Fechner, U. Denecke, P. Rauch, S. Emmerling, E. Ahci-Ezgi

NUMERICAL AND EXPERIMENTAL STUDIES OF ROTORCRAFT ICING PHENOMENA...... 1250 J. W. Kim, L. N. Sankar, J. Palacios, R. E. Kreeger

RELEVANCE OF FLYING QUALITIES DETERIORATION BOUNDARY FOR A HELICOPTER ...... 1261 A. R. Tajar

WAKE CHARACTERISTICS OF LARGE-SCALEWIND TURBINES...... 1271 Y. X. Wang, V. Leble, M. White, G. N. Barakos

SAFETY

A MODEL-BASED APPROACH FOR EVENT DEFINITION IN SUPPORT OF FLIGHT DATA MONITORING...... 1283 A. Gavrilovski, D. N. Mavris

AVIATION SAFETY: THE ROLE OF HUMAN ERROR ...... 1297 M. Bredewold

EDGE-BASED APPROACH TO ESTIMATE THE DRIFT OF A HELICOPTER DURING FLIGHT...... 1308 A. Gatter

THE DEVELOPMENT AND VALIDATION OF A NUMERICAL MODELLING APPROACH FOR ROTORCRAFT DITCHING ...... 1320 J. D. A. Horton, G. S. Hawkes, T. Neville

SIMULATION AND TRAINING

MODEL OF HELICOPTER PILOT'S CONTROLS ACTIVITY FOR SHIPBOARD OPERATIONS...... 1329 J. M. P. Figueira, A. Taghizad, M. Abid

THE EFFECT OF SHIP SIZE ON AIRWAKE AERODYNAMICS AND MARITIME HELICOPTER OPERATIONS ...... 1343 P. Scott, M. White, I. Owen

STRUCTURES AND MATERIALS

A METHODOLOGY TO ASSESS DAMAGE TOLERANCE OF COMPOSITE STRUCTURES BY FEA SIMULATION TECHNIQUE...... 1354 U. Burger, L. Rochat, C. Breton, J. Markmiller

A NEW SEMI-EMPIRICAL DAMAGE TOLERANCE AND FATIGUE EVALUATION APPROACH FOR COMPOSITE ROTORCRAFT AIRFRAME STRUCTURES...... 1364 A. Engleder, D. Francescatti, R. Arelt, U. Burger

BIRD STRIKE SIMULATION ON COMPOSITE STRUCTURES...... 1372 R. Vijayakumar, K. Gulbarga, R. Ravindranath

MARKER LAYER TECHNOLOGY: ADVANCED CRACK DETECTION IN ELASTOMERIC BEARINGS ...... 1386 J. R. Halladay, H. Halilovic

RESULTS OF A CASE STUDY ON THE APPLICATION OF AUTOMATED FIBER PLACEMENT FOR A HELICOPTER AIRFRAME STRUCTURE ...... 1391 U. Eberth, L. Wolters

TECHNOLOGICAL TESTS REGARDING THE QUALIFICATION OF THE REACH COMPLIANT SURFACE TREATMENT PROCESSES FOR HELICOPTER DYNAMIC SYSTEMS...... 1397 A. Güzel, S. Heredia, J.-M. Besson

TEST AND EVALUATION

EXPERIMENTAL TECHNOLOGY FOR CONDITION MONITORING OF HELICOPTER ROTOR UNITS IN FLIGHT...... 1406 A. Mironov, P. Doronkin, A. Priklonsky

HANDLING QUALITIES EVALUATION OF AN AUTOMATIC SLUNG LOAD STABILISATION SYSTEM FOR THE ACT/FHS...... 1408 D. Nonnenmacher, M. Jones

IN-FLIGHT TUNING SYSTEM FOR THE CH-53G HELICOPTER...... 1426 U. T. P. Arnold, D. Fuerst

ROTOR-WING INTERACTION PHENOMENA FOR THE ERICA TILT-WING ROTORCRAFT CONFIGURATION IN THE DNW-LLF WIND TUNNEL ...... 1439 A. C. De Bruin, O. Schneider

STRUCTURAL DEMONSTRATION OF AN ACTIVE BACK-FLOW FLAP UNDER WIND TUNNEL CONDITIONS...... 1449 S. Opitz, A. D. Gardner, C. B. Merz, C. C. Wolf

UNMANNED ROTORCRAFT FLIGHT TESTING USING WIRELESS SENSOR NETWORKS FOR DATA COLLECTION AND CLOUD-BASED COMPUTING ...... 1460 D. O'Neil, S. Low

WIND TUNNEL TESTING OF A VARIABLE-PITCH QUADROTOR UAV ISOLATED ROTOR ...... 1475 F. Riccardi

Author Index