1. It appears that a computationally efficient algorithm for unsteady flows could offer significant benefits in a variety of applications. These include helicopter rotors in forward flight [ref. 12,131, counter rotating propfans [ref. 141, rotorstator combinations in turbomachinery [ref. 15-161, aeroelastic problems, oscillatory flows induced by viscous effects, and the calculation of acoustic signatures. A computer program to treat helicopter rotors by the present method is currently under development. This incorporates a multisectored rotating mesh with one blade in each sector, and mesh deformation to allow for blade flapping. A second anticipated extension is to wing flutter calculations. Bendiksen and Kousen used the program of Venkatakrishnan and Jameson [ref. 61 to study a two dimensional flutter model, and discov
2. ered limit cycles due to nonlinear 6 transonic effects [ref. 17-181. With the new implicit program there is now an opportunity to explore similar effects in three dimensional flow.
3. for Solving the Euler Equations," AIAA Journal, Vol.20, 1982, pp.1565-1571.