Icing Limit and Wet-Surface Temperature Variation for Two Airfoil Shapes Under Simulated High-Speed Flight Conditions
Report presenting a study of the wet-surface temperature and stream conditions that result in ice-free surfaces for bodies in flight through icing clouds and a comparison of these experimental results with calculated results using the analytical method. Two symmetrical airfoil models were used in the investigation and testing occurred for a range of Mach numbers and pressure altitudes. Results regarding chordwise variation of pressure distribution, chordwise variation of recovery factor, results with the diamond airfoil and circular-arc airfoil, and the experimental and analytical results are presented.
A model for forecasting enroute controller requirements was developed by Tien and Schonfeld [1] for incorporation into the FAA's NAS Strategy Simulator. In this study, one critical component in their work is improved by using probit regression model in order to more reasonably predict the number of controller positions per sector. Probabilities of using between 0 and 4 controllers per sector are estimated from the controller work history based on traffic densities and other sector characteristics. The improved controller estimation model is then demonstrated for its practicability and can provide an estimate of annual controller requirements in response to future traffic growth and capacity for evaluating future enroute performance.