Math Model Development

Fixed-Wing | Rotary-Wing | Commercial | Military

Since 1973, Bihrle Applied Research Inc (BAR) has provided the military and civil aerospace industry with expertise in the area of flight dynamics modeling and analysis, compiling a resume of over 150 aircraft configurations.

Leveraging a unique range of capabilities and resources, BAR has played a key role in all aspects of flight model development efforts, from the collection and analysis of source data, through the development of complex math-models, to the validation and final acceptance of advanced trainers.


BAR is a provider of mathematical software models that are used for both engineering and training applications. BAR tailors each flight model development project to the specific requirements of the customer, taking into account fidelity specifications, available source data, simulation application, and budget. Given these requirements, BAR develops the flight model using the appropriate source data, including aircraft manufacturer data packages, wind tunnel test data, flight test data, or predictive data generated by BAR’s aerodynamic prediction software tools. Whether the application is a full mission military trainer, a civil Level-D Full Flight Simulator (FFS), an engineering simulator or a predictive threat model for mission simulations, BAR will meet your flight model needs.

Sub-System Model Development

To complement its flight model development capabilty, BAR excels at the development of sub-system models including engine, FADEC, landing gear models, electrical system models, and hydraulic system models. In addition to modeling normal operations, models can be further enhanced to include the system failure modes and malfunction logic required to meet specific training requirements.

Flight Model Update

Like most components of a simulator, flight models must be updated to keep up with aircraft configuration changes, FAA/JAA requirements and endorsements, and the latest advances in modeling techniques and model validation. BAR engineers have unique experience in the analysis of legacy flight models as well as the expertise to integrate model updates to improve fidelity in all areas of the flight envelope.

Upset & Adverse Effects Modeling

Modern source data collection and analysis techniques developed by BAR have lead to significant advances in the state of the art in modeling vehicle response during upset, recovery and in-flight icing conditions. By incorporating the data needed for accurate predictions of icing, stall and post-stall motions, not only is the flight envelope of a simulator expanded, but pilot awareness is significantly enhanced during these dangerous conditions -- a training capability that has been proven to save lives as well as vehicles.

Source Data Collection

Since the 1970’s, BAR has been a leader in the measurement of aerodynamic forces and moments derived from wind tunnel and flight test. During this time, BAR has developed advanced test techniques for collecting large amplitude static and dynamic aerodynamic data, icing effects data, and aerodynamic data characterizing the effects of propeller slip stream, resulting in the highest fidelity models.