Dr. Charles R. O’Neill is a Ph.D.-trained aerospace and mechanical engineer, licensed pilot, and practicing physics and engineering consultant who provides expert witness services in aviation and related technical matters. Through Aerofluids LLC, he offers independent, scientifically grounded analysis and testimony concerning aircraft performance, aerodynamics, flight dynamics, systems integration, unmanned aerial systems, and the physical principles that govern flight. His combination of advanced academic credentials, industry rapid-prototyping experience, extensive flight operations, and field-deployed systems work equips him to assist courts and counsel in understanding complex aviation evidence.
Qualifications and Credentials
Dr. O’Neill holds a Ph.D. in Aerospace and Mechanical Engineering, an M.S. in Mechanical Engineering, and a B.S. in Aerospace Engineering from Oklahoma State University. He is a Private Pilot with Airplane Single-Engine Land, Instrument Airplane, High Performance, and Complex ratings, and holds an FAA Part 107 Remote Pilot certificate for small unmanned aircraft systems.
His professional career spans university faculty service (Assistant Professor of Aerospace Engineering and Mechanics at a Tier-1 / R-1 university), leadership of airborne remote-sensing research programs, rapid-prototyping aerodynamics work on a high-performance twin-engine jet aircraft at Cessna, and current service as Director of Research for an aerospace and defense firm focused on RF systems, electronic warfare, and tactical data links. He founded Aerofluids LLC in 2013 specifically to provide aerospace, physics, and mathematics consulting, including physics and engineering expert witness services.
Technical and Operational Expertise Relevant to Aviation Matters
Dr. O’Neill’s expertise centers on the physical and engineering principles that govern aircraft behavior and systems performance. He has performed whole-aircraft computational fluid dynamics analyses for stability and control, loads, and performance estimation in time-critical design environments; developed rapid store-separation prediction methods that couple CFD with rigid-body dynamics; conducted low- and high-speed wind-tunnel testing and data reduction; and taught graduate and undergraduate courses in aerodynamics, aircraft performance, flight dynamics and control, flight-test engineering, and aircraft systems.
Operationally, he has designed, built, integrated, and flown both manned experimental aircraft and numerous unmanned aerial systems, including leading a competition-winning Design-Build-Fly team and directing disaster-response UAS deployments. He has served as mission director for airborne radar surveys, integrating complex sensor systems onto research aircraft (including Twin Otter and light-sport platforms) and interfacing with pilots, mechanics, and support personnel under field conditions. This dual perspective—analytic engineering rigor combined with hands-on flight and systems experience—enables him to evaluate both theoretical predictions and real-world operational realities.
Additional relevant capabilities include aircraft systems integration, radio-frequency and antenna systems as they relate to aviation platforms, mission planning and performance optimization, and the interpretation of flight-test and sensor data. His work has been documented in peer-reviewed publications and technical presentations spanning aerodynamics, airborne radar systems, and related engineering topics.
Alignment with Federal Rule of Evidence 702
Federal Rule of Evidence 702 governs the admissibility of expert testimony in federal courts. As amended (effective December 1, 2023), the Rule provides that a witness who is qualified as an expert by knowledge, skill, experience, training, or education may testify in the form of an opinion or otherwise if the proponent demonstrates to the court that it is more likely than not that: (a) the expert’s scientific, technical, or other specialized knowledge will help the trier of fact to understand the evidence or to determine a fact in issue; (b) the testimony is based on sufficient facts or data; (c) the testimony is the product of reliable principles and methods; and (d) the expert’s opinion reflects a reliable application of the principles and methods to the facts of the case.
Dr. O’Neill’s qualifications satisfy the threshold requirement of specialized knowledge derived from education, training, and extensive practical experience. His opinions are grounded in established principles of aerodynamics, flight mechanics, aircraft performance, and systems engineering—disciplines whose methods (including computational analysis, experimental testing, flight-test procedures, and engineering analysis) are widely accepted, peer-reviewed, and subject to known standards and error characterization. He applies these methods to the specific facts and data of each matter, ensuring that conclusions remain within the bounds of what the underlying science and engineering reliably support.
Counsel retaining Dr. O’Neill can therefore present testimony that meets the reliability and helpfulness standards of Rule 702, assisting the court and fact-finder in understanding technical aviation evidence without overstatement beyond the reliable application of accepted methods.
Representative Scope of Testimony
Matters in which Dr. O’Neill’s expertise is particularly well suited include aircraft performance and flight-path analysis; aerodynamic and stability-and-control issues; atmospherics, condensation, and water effects on aviation and engines; flight-test and experimental data interpretation; systems integration and aircraft modification effects; unmanned aircraft systems design, performance, and operations; and the physical principles underlying aviation accidents or incidents. He is prepared to review technical documentation, perform independent analyses where appropriate, prepare written reports, and provide deposition and trial testimony.
Inquiries regarding availability, engagement terms, and conflict screening may be directed to Aerofluids LLC at oneill@aerofluids.com or (617) 449-8206. Additional information is available at charles-oneill.com.