What does it take to make great, hi-fidelity flight simulators, true to the aircraft? There are a lot of answers to that question, but one answer might be a realistic flight model that can reproduce aircraft performance, flight dynamics, handling qualities and control feel throughout the operational envelope. At Frasca, the Aeronautical Engineering team is responsible for making those things happen, and one of the invaluable capabilities that we rely on to that end is flight testing. By flight testing the aircraft we seek to replicate, we acquire the needed data to make the sim fly like the aircraft.