Juergen Rauleder

Dr. Juergen Rauleder

Assistant Professor and Associate Director of Vertical Lift Research Center of Excellence

juergen.rauleder@gatech.edu
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Biography

Prof. Juergen Rauleder’s research interests are the experimental and applied numerical aerodynamics, with a focus on interactional aerodynamics, new propulsion concepts, coupled aerodynamics with flight dynamics, fluid-structure interactions, as well as active, shape-adaptive rotating and fixed wings. His basic research is applied to the aerodynamic design, optimization, and understanding of current and future air vehicles, including advanced (urban) aerial mobility and UAS, as well as pilot training and simulators. Juergen’s research is sponsored by the U.S. Army, Navy, NASA, ONR, NATO, the EU, and by industry. He received a master’s degree from the University of Stuttgart and a PhD from the University of Maryland under the guidance of Prof. Gordon Leishman. Juergen is an Associate Fellow of AIAA, serves on the AIAA Applied Aerodynamics Committee, and he is the chair of the VFS Aerodynamics Technical Committee.

Lab/Collaborations

Disciplines

  • Aerodynamics & Fluid Mechanics
  • Aeroelasticity & Structural Dynamics
  • Flight Mechanics & Controls

AE Multidisciplinary Research Areas

  • Vertical Lift and Urban Air Mobility

Publications

2024

Chen W.H., and Rauleder, J., “Unsteady Loads of a Scaled Rotor on and near the Landing Deck of the NATO Generic Destroyer with Concurrent Stereo PIV and Surface Pressure Measurements,” Journal of the American Helicopter Society, Vol. 69, No. 4, 2024, DOI: 10.4050/JAHS.68.042008

Hosseini, B., Rhein, J., Holzapfel, F., Grebing, B., and Rauleder, J. “Conversion of a Coaxial Rotorcraft to a UAV—Lessons Learned”, Aerospace, Vol 11, Article 681, 2024. DOI: 10.3390/aerospace11080681

Srivathsan, S., Rauleder, J., “Wind Tunnel Measurements on the Effect of Propeller Tilt on Propeller–Wing Interactional Aerodynamics”, Aviation Forum, AIAA, Las Vegas, United States of America, July 2024, DOI: 10.2514/6.2024-4146

Wong, Z. F. G., Guo, N., Neall, S., Jin, Z., Graber, L., and Rauleder, J. “CFD simulation and design of a new supercritical CO2 circuit breaker contact and nozzle system” In 2024 IEEE Electrical Insulation Conference (EIC), pp. 1-4. IEEE, 2024 DOI: 10.1109/EIC58847.2024.10579111

Kurban, E., Toxopeus, S. L., Ashok, S., and Rauleder, J., “Evaluation of Boundary Conditions for Realistic Ship Airwakes Using a GPU-Accelerated Lattice-Boltzmann Solver Compared to High-Fidelity RANS–LES and Experiments,” 35th Symposium on Naval Hydrodynamics, Nantes, France, July 2024.

Ashok, S.G., and Rauleder, J., “Towards Real-Time Coupled Ship–Rotorcraft Interactional Simulations using GPU-Accelerated Lattice-Boltzmann Method,” Vertical Flight Society Forum 80, Montréal, Québec, Canada, May 7–9, 2024. DOI: 10.4050/F-0080-2024-1346

Atte, A., and Rauleder, J., “Investigation of Rotor Vertical Offset Effects on Quadrotor Performance,” Vertical Flight Society 80th Annual Forum, Montréal, Québec, Canada, May 7-9 2024. DOI: 10.4050/F-0080-2024-1388

Chen, W.H., and Rauleder, J., “Unsteady Loads of a Scaled Rotor on and near the Landing Deck of the NATO Generic Destroyer with Concurrent Stereo PIV and Surface Pressure Measurements,” Vertical Flight Society 80th Annual Forum, Montréal, Québec, Canada, May 7-9 2024. DOI: 10.4050/F-0080-2024-1063

Srivathsan, S., Sridhar, P., Smith, M., and Rauleder, J., “Experimental and Computational Investigations of Propeller-Wing Interactions for Varying Propeller Tilt Angles,” Vertical Flight Society 80th Annual Forum, Montréal, Québec, Canada, May 7-9 2024. DOI: 10.4050/F-0080-2024-1337

Ashok, S.G., and Rauleder, J., “Mid-Fidelity NATO Generic Destroyer Static and Moving-Ship Airwake Simulations Using the Lattice-Boltzmann Method Compared with Experimental Data, Ocean Engineering, Vol. 298, 2024, 117264, ISSN 0029-8018, DOI: 10.1016/j.oceaneng.2024.117264

Ashok, S.G., Jude, D., and Rauleder, J., “Comparison of Navier–Stokes and Lattice-Boltzmann Method CFD Approaches for Ship–Rotor Interactional Aerodynamics Using Cartesian GPU Solvers,” Transformative Vertical Flight 6th Decennial Aeromechanics Specialists’ Conference, Santa Clara, CA, February 2024

Ashok, S.G., Hosseini, S., and Rauleder, J., “Real-Time Dynamic Inflow Model for a Coaxial Helicopter Configuration Using the Lattice–Boltzmann Method,” AIAA SciTech Forum, Orlando, Florida, January 2024, DOI: 10.2514/6.2024-1718

Carter, D., Atte, A., and Rauleder, J., “Near Boundary Multirotor Interactional Aerodynamics,” AIAA SciTech Forum, Orlando, Florida, January 2024, DOI: 10.2514/6.2024-1723

Hosseini, S., Mbikay, Z., Bachfischer, M., Holzapfel, F., and Raulder, J., “Simulation, Flight Dynamics, and Control Design for a Coaxial Rotorcraft,” AIAA SciTech Forum, Orlando, Florida, January 2024, DOI: 10.2514/6.2024-1717

Ko, J., German, B., and Rauleder, J., “Wind Effects on Urban Air Mobility Noise During Landing Procedures,” AIAA SciTech Forum, Orlando, Florida, January 2024, DOI: 10.2514/6.2024-2300

Safieh, D., Shah, M., Yan, S., and Rauleder, J., “Aero-Propulsive Coupling on Wing Integrated Electric Ducted Fan System,” AIAA SciTech Forum, Orlando, Florida, January 2024, DOI: 10.2514/6.2024-1726

2023

Komp, D., Hajek, M., Yavrucuk, I., and Rauleder, J., “Rotor Power Savings and Pitch-Link Load Reductions with Spanwise-Varying Active Camber Morphing,” AIAA Journal of Aircraft, 2023, DOI: 10.2514/1.C037505

Platzer, S., Hajek, M., Mortimer, P., Sirohi, J., and Rauleder, J., “Investigation of the Flow Fields of Coaxial Co-Rotating and Counter-Rotating Rotors in Hover Using Measurements and Simulations,” Journal of the American Helicopter Society, 2023, DOI: 10.4050/JAHS.68.042008

Mortimer, P., Sirohi, J., Platzer, S., and Rauleder, J., “Phase-Resolved Flowfield Measurements of a Coaxial Counter-Rotating Rotor in Hover,” Journal of Aircraft, 2023, DOI: 10.2514/1.C037115

Lee, H., Mortimer, P., Seshadri, P., Sirohi J., and Rauleder, J., “Machine Learning Based Approaches for Estimating Airloads in Hover,” 49th European Rotorcraft Forum Proceedings, Bückeburg, Germany, Sept 2023.

Oates, B., Su ,P., Hrynuk, J., Smith, S., and Rauleder, J., “Evaluation of a Range of Modeling Approaches For UAV Unsteady Aerodynamics,” 49th European Rotorcraft Forum Proceedings, Bückeburg, Germany, Sept 2023.

Safieh, D. and Rauleder, J., “Effects of Aero-Propulsive Coupling on High Solidity Electric Ducted Fan Performance for Various Wing Integrations,” 49th European Rotorcraft Forum Proceedings, Bückeburg, Germany, Sept 2023.

Oates, B., Su ,P., Hrynuk, J., Smith, M.J., and Rauleder, J., “Evaluation of a Range of Modeling Approaches For UAV Unsteady Aerodynamics,” 49th European Rotorcraft Forum Proceedings, Bückeburg, Germany, Sept 2023.

Srivathsan, S., and Rauleder, J., “Wind Tunnel Measurements of Propeller—Wing Interactional Aerodynamics” Aviation Forum, AIAA, San Diego, California, June 2023, DOI: 10.2514/6.2023-3542

Carter. D., and Rauleder, J., “Multirotor Interactional Aerodynamics with Boundary Effects,” Aviation Forum, AIAA, San Diego, California, June 2023, DOI: 10.2514/6.2023-3237

Ko, J., German, B., and Rauleder, J., “Community Noise Impact of Multirotor Configurations During Landing Procedures,” Aviation Forum, AIAA, San Diego, California, June 2023, DOI: 10.2514/6.2023-3362

Ashok, S.G., and Rauleder, J., “NATO Generic Destroyer Moving-Ship Airwake Validation and Rotor-Ship Dynamic Interface Computations using Immersed Boundary Lattice-Boltzmann Method,” Vertical Flight Society, Forum 79, West Palm Beach, FL, May 16-18, 2023. DOI: 10.4050/F-0079-2023-1812

Herz, S., Atte, A., Seth, D., Rauleder, J., and McCrink, M., “Impact of Rotor-Rotor and Rotor-Body Aerodynamic Interactions on Quadrotor Vehicle Performance,” Vertical Flight Society, Forum 79, West Palm Beach, FL, May 16-18, 2023. DOI: 10.4050/F-007

Oates, B., Kurban, E., Smith, M.J., and Rauleder, J., “Evaluation of High- and Mid-Fidelity Computational Fluid Dynamics for Complex Ship Airwake Analysis with New Experimental Data,” Vertical Flight Society’s 79th Annual Forum & Technology Display, West Palm Beach, FL, May, 2023. DOI: 10.4050/F-0079-2023-17973

Srivathsan, S., and Rauleder, J., ”Experimental Wind Tunnel Investigation on Propeller–Wing Interactional Aerodynamics,” AIAA SciTech Forum, National Harbor, Maryland, January 2023, DOI: 10.2514/6.2023-1752

2022

Kurban, E., Ashok, S.G., and Rauleder, J., “Computationally Efficient Ship Airwake Simulations for Rotorcraft Shipboard Operations Using a GPU-Accelerated Lattice-Boltzmann Solver,” 48th European Rotorcraft Forum Proceedings, Winterthur, Switzerland, Sept 2022.

Ashok, S.G., and Rauleder, J., “Investigation of Interpolation Methodologies for Arbitrary Lagrangian Eulerian Lattice-Boltzmann Formulations with Applications to Real-Time Rotorcraft Flight Simulations,” AIAA 2022-3750. AIAA AVIATION 2022 Forum. June 2022. DOI: 10.2514/6.2022-3750

Fernandez, I., Horvat, B., and Rauleder, J., “Evaluation of boundary condition treatments for complex geometries in Lattice-Boltzmann flow simulations,” AIAA 2022-3675. AIAA AVIATION 2022 Forum. June 2022. DOI: 10.2514/6.2022-3675

Atte, A., Wylie, D., and Rauleder, J., “Experimental Investigation of Multirotor Aerodynamic Interactions”: Vertical Flight Society, Forum 78, Fort Worth, TX, May 10-12, 2022. DOI: 10.4050/F-0078-2022-17467

Abdelmoula, A., Yurt, M.K., Komp, D., Hajek, M., and Rauleder, J., “CFD/CSD Coupling for Camber Morphed Rotor Blades,” AIAA 2022-3751. AIAA AVIATION 2022 Forum. June 2022. DOI: 10.2514/6.2022-3751

2021

Komp, D., Kumar, S., Hajek, M., and Rauleder, J., “Effect of active camber morphing on rotor performance and control loads,” Aerospace Science and Technology, 108 (2021), DOI: 10.1016/j.ast.2020.106311 

Faust, J. A., Jung, Y. S., Baeder, J., Bauknecht, A., and Rauleder, J. Interactional Aerodynamic Analysis of an Asymmetric Lift-Offset Compound Helicopter in Forward Flight. Journal of the American Helicopter Society66(3), 2021, pp. 1-17.  DOI: 10.4050/JAHS.66.032011

Platzer, S., Hajek, M., Rauleder, J., Mortimer, P., and Sirohi, J. “Investigation of the flow fields of coaxial stacked and counter-rotating rotors using PIV measurements and URANS simulations,” In Proceedings of the Vertical Flight Society’s 77th Annual Forum and Technology Display, Virtual (pp. 10-14). May 2021. DOI: 10.4050/F-0077-2021-16712

Bludau, J., Hajek, M., and Rauleder, J., “Solving the Ship-Rotorcraft Dynamic Interface Problem Using Lattice-Boltzmann Aerodynamics Two-Way Coupled with Blade Element Based Flight Dynamics,” VFS 77th Annual Forum, 2021.  DOI: 10.4050/F-0077-2021-16725

Horvat, B., Hajek, M., and Rauleder, J., “Computational Flight Path Analysis of a Helicopter in an Offshore Wind Farm using a Lattice-Boltzmann Method,” AIAA SciTech Forum, 2021, DOI: 10.2514/6.2021-1827

Kumar, S., Komp, D., Hajek, M., and Rauleder, J., “Effect of Active Camber on Rotor Noise, Power and Hub Vibration,” AIAA SciTech Forum, 2021, DOI: 10.2514/6.2021-1927  

Komp, D., Hajek, M., and Rauleder, J., “Rotor Performance Enhancements with Spanwise Varying Active Camber Morphing,” AIAA SciTech Forum, 2021, DOI: 10.2514/6.2021-0200 

2020

Feil, R., Hajek, M., and Rauleder, J., “Vibratory Load Predictions of a High-Advance-Ratio Coaxial Rotor System Validated by Wind Tunnel Tests.” Journal of Fluids and Structures, 92 (2020), 102764. DOI: 10.1016/j.jfluidstructs.2019.102764 

Huang, Q., Abdelmoula, A., Chourdakis, G., Rauleder, J., and Uekermann, B. “CFD/CSD Coupling for an Isolated Rotor Using preCICE,” in: WCCM-ECCOMAS2020. DOI: 0.23967/wccm-eccomas.2020.081

Mortimer, P., Sirohi, J., Platzer, S., and Rauleder, J., “Single Rotor Inflow and Wake Characterization in Hover with Dynamic Pitch Excitation,” Vertical Flight Society 76th Annual Forum, Oct 2020. DOI: 10.4050/F-0076-2020-16476

Mortimer, P., Johnson, C., Sirohi, J., Platzer, S., and Rauleder, J. “Experimental and Numerical Investigation of a Variable-Speed Rotor for Thrust Control,” AIAA Aviation 2020 Forum, June 2020. DOI: 10.2514/6.2020-2791

Platzer, S., Rauleder, J., Hajek, M., Mortimer, P., Jain, P., and Sirohi, J., “Experiments and Computations Towards an Improved Understanding and Modeling of the Dynamic Inflow of Rotors in Hover,” VFS Aeromechanics for Transformative Vertical Flight Meeting, San Jose, CA, Jan 2020. DOI: 10.4050/F-0076-2020-16476

Faust, J., Jung, Y. S., Baeder, J., and Rauleder, J., “Aerodynamic Analysis of an Asymmetric Lift-Offset Compound Helicopter in Forward Flight using the Mercury CFD Framework,” VFS Aeromechanics for Transformative Vertical Flight Meeting, San Jose, CA, Jan 2020.  DOI:

Horvat, B., Hajek, M, and Rauleder, J., “Analysing Rotorcraft Vortex Encounter Methods with a Lattice-Boltzmann Method Based GPU Framework,” AIAA SciTech 2020 Forum, Orlando, FL, Jan 2020. DOI: 10.2514/6.2020-0539 

Abdelmoula, A., Platzer, S., Hajek, M., and Rauleder, J., “Numerical Investigation of the Effects of Dynamic Camber Variation on the Airfoil Characteristics of a Pitching Rotor Airfoil,” AIAA SciTech 2020 Forum, Orlando, FL, Jan 2020. DOI: 10.2514/6.2020-1302 

2019

Petermann, J., Jung, Y. S., Baeder, J., and Rauleder, J., “Validation of Higher-Order Interactional Aerodynamics Simulations on Full Helicopter Configurations,” Journal of the American Helicopter Society, 64(4), 2019, pp. 1-13. DOI: 10.4050/JAHS.64.042002 

Uehara, D., Sirohi, J., Feil, R., and Rauleder, J., “Blade Passage Loads and Deformation of a Coaxial Rotor System in Hover,” Journal of Aircraft, 56(6), 2019, pp. 2144 – 2157. DOI: 10.2514/1.C035469 

Feil, R., Rauleder, J., Cameron, C.G., and Sirohi, J., “Aeromechanics Analysis of a High-Advance-Ratio Lift-Offset Coaxial Rotor System,” Journal of Aircraft, 56(1), 2019, pp. 166 – 178. DOI: 10.2514/1.C034748

Kumar, S., Komp, D., Hajek, M., and Rauleder, J., “Integrated Rotor Performance Improvement and Vibration Reduction Using Active Camber Morphing,” Proceedings of the ASME 2019 Conference on Smart Materials, Adaptive Structures, and Intelligent Systems Conference, SMASIS 2019, Paper No. SMASIS2019-5588, Louisville, KY, Sept 9-11, 2019. DOI: 10.1115/SMASIS2019-5588 

Mortimer, P., Sirohi, J., Platzer, S., and Rauleder, J.,“Coaxial Rotor Wake Measurements in Hover Using Phase-Resolved and Time-Resolved PIV,” 75th Annual Forum Proceedings of the Vertical Flight Society (VFS), Philadelphia, PA, May 2019. DOI: 10.4050/F-0075-2019-14519

Komp, D., Kumar, S., Abdelmoula, A., Hajek, M., and Rauleder, J., “Investigation of Active Rotor Design and Control for Performance Improvement,” 75th Annual Forum Proceedings of the Vertical Flight Society (VFS), Philadelphia, PA, May 2019. DOI: 10.4050/F-0075-2019-14530

Abdelmoula, A., and Rauleder, J., “Aerodynamic Performance of Morphed Camber Rotor Airfoils,” AIAA Scitech 2019 Forum, San Diego, CA, January 2019. DOI: 10.2514/6.2019-1101 

2018

Uehara, D., Feil, R., Sirohi, J., and Rauleder, J., “Measurement of Transient Blade Passage Loads of a Coaxial Counter-Rotating Rotor in Hover,” 44th European Rotorcraft Forum Proceedings, Delft, NL, September 2018. 

Platzer, S., Milluzzo, J., and Rauleder, J., “Investigation on Hovering Rotors over Inclined Ground Planes – a Computational and Experimental Study,” 44th European Rotorcraft Forum Proceedings, Delft, NL, September 2018. 

Petermann, J., Jung, Y., Baeder, J.D., and Rauleder, J., “Higher-Order Simulations of Interactional Aerodynamics on Full Helicopter Configurations Using a Hamiltonian Strand Approach,” 44th European Rotorcraft Forum Proceedings, Delft, NL, September 2018. 

Rauleder, J., Abdelmoula, A., Komp, D., and Van der Wall, B., “Aerodynamic Performance of Morphing Blades and Rotor Systems,” 74th Annual Forum Proceedings of the American Helicopter Society (AHS), Phoenix, AZ, May 2018. 

2017

Bludau, J., Rauleder, J., and Hajek, M., “Validation of a Dynamic Inflow Model Based on a Flight Dynamics Model and a Lattice-Boltzmann Fluid Solver Using Flight Test Data,” 43rd European Rotorcraft Forum Proceedings, Milan, Italy, September 2017. 

Feil, R., Rauleder, J., and Hajek, M., “Vibratory Load Predictions of a High-Advance-Ratio Coaxial Rotor System Validated by Wind Tunnel Tests,” 43rd European Rotorcraft Forum Proceedings, Milan, Italy, September 2017. Best Paper Award.  DOI: 10.1016/j.jfluidstructs.2019.102764

Cameron, C.G., Feil, R., Sirohi, J., and Rauleder, J., “Measurement of Transient Loads and Blade Deformations in a Coaxial Counter-Rotating Rotor,” 73rd Annual Forum Proceedings of the American Helicopter Society (AHS), Fort Worth, TX, May 2017. 

Bludau, J., Rauleder, J., Friedmann, L., and Hajek, M., “Real-Time Simulation of Dynamic Inflow Using Rotorcraft Flight Dynamics Coupled With a Lattice-Boltzmann Based Fluid Simulation,” Proceedings of the 55th AIAA Aerospace Sciences Meeting, Grapevine, TX, Jan 2017. DOI: 10.2514/6.2017-0050 

2016

Rauleder, J., and Leishman, J.G., “Interactions of a Vortical Flow with Dispersed Particles Below a Rotor,” AIAA Journal, Vol. 54, No. 11, 2016, pp. 3361 – 3373. DOI: 10.2514/1.J053823 

Feil, R., Rauleder, J., and Hajek, M., “Aerodynamic and Dynamic Interactions with Coaxial Rotor Systems, Deutscher Luft- und Raumfahrtkongress,” Braunschweig, Germany, September 2016. 

Bludau, J., Rauleder, J., Friedmann, L., and Hajek, M., “Real-Time Simulation of Rotor Inflow Using a Coupled Flight Dynamics and Fluid Dynamics Simulation,” Deutscher Luft- und Raumfahrtkongress, Braunschweig, Germany, Sept 2016. 

Platzer, S., Rauleder, J., Hajek, M., Milluzzo, J., “Experimental and Computational Investigation on Rotor Blades with Spanwise Blowing,” 42nd European Rotorcraft Forum Proceedings, Lille, France, September 2016. 

Feil, R., Rauleder, J., Hajek, M., Cameron, C.G., and Sirohi, J., “Computational and Experimental Aeromechanics Analysis of a Coaxial Rotor System in Hover and Forward Flight,” 42nd European Rotorcraft Forum Proceedings, Lille, France, September 2016. 

Platzer, S., Rauleder, J., and Hajek, M., “Investigation of Centrifugal Pumping Rotor Blades in Hover Using CFD,” 34th AIAA Applied Aerodynamics Conference Proceedings, Washington D.C., June 2016. DOI: 10.2514/6.2016-3420 

Feil, R., Rauleder, J., and Hajek, M., “Aeromechanics Analysis of a Coaxial Rotor System in Hover and High-Advance-Ratio Forward Flight,” 34th AIAA Applied Aerodynamics Conference Proceedings, Washington D.C., June 2016. DOI: 10.2514/6.2016-3419 

2014

Rauleder, J., and Leishman, J.G., “Particle–Fluid Interactions in Rotor-Generated Vortex Flows,” Experiments in Fluids, Vol. 55, No. 3, 2014, pp. 1 – 15. DOI: 10.1007/s00348-014-1689-5

Rauleder, J., and Leishman, J.G., “Flow Environment and Organized Turbulence Structures near a Plane below a Rotor,” AIAA Journal, Vol. 52, No. 1, 2014, pp. 146 – 161. DOI: 10.2514/1.J052315  

Rauleder, J., and Leishman, J.G., “Fluid–Particle Interaction in Vortex-Induced Dual-Phase Flows Above a Sediment Bed,” 44th AIAA Fluid Dynamics Conference Proceedings, Atlanta, GA, June 16 – 20, 2014. DOI: 10.2514/6.2014-2922   

2013

Rauleder, J., and Leishman, J.G., “Turbulence Modifications and Phase Couplings in Ground Effect under Simulated Brownout Conditions,” 69th Annual Forum Proceedings of the American Helicopter Society (AHS), Phoenix, AZ, May 21 – 23, 2013. 

2012

Rauleder, J., and Leishman, J.G., “Measurements of Organized Turbulence in the Dual-Phase Flow below a Rotor,” 38th European Rotorcraft Forum Proceedings, Amsterdam, NL, September 4 – 7, 2012.   

Rauleder, J., and Leishman, J.G., “Flow Environment and Organized Turbulence Structures at the Ground below a Hovering Rotor,” 68th Annual Forum Proceedings of the American Helicopter Society (AHS), Fort Worth, TX, May 1 – 3, 2012.  DOI: 10.2514/1.J052315 

2011

Rauleder, J., and Leishman, J.G., “Measurements of the Turbulent Flow Environment on the Ground below a Hovering Rotor,” 37th European Rotorcraft Forum Proceedings, Gallarate, Italy, September 13 – 15, 2011.   

​Syal, M., Rauleder, J., Tritschler, J.K., and Leishman, J.G., “On the Possibilities of Brownout Mitigation Using a Slotted-Tip Rotor Blade,” 29th AIAA Applied Aerodynamics Conference Proceedings, Honolulu, HI, June 27 – 30, 2011. DOI: 10.2514/6.2011-3183 

2010

Milluzzo, J., Sydney, A., Rauleder, J., and Leishman, J.G., “In-Ground-Effect Aerodynamics of Rotors with Different Blade Tips,” 66th Annual Forum Proceedings of the American Helicopter Society (AHS), Phoenix, AZ, May 10 – 13, 2010. 

Favorite Cereal

Oatmeal