Reply by Author to P. A. Sullivan

Hullender, D.A., Wormley, D.N., and Richardson, H.H., Active Control of Vehicle Air Cushion Suspensions, Journal of Dynamic Measurement and Control, Vol. 94, March 1972, pp.41-48. Genin, J., Ginsberg, J.H., and Ting, B.C., Fluid Suspension Model for Air Cushioned Vehicle, Journal of Sound and Vibration, Vol. 25, Nov. 1972, pp. 83-93. Sweet, L.M., Richardson, H.H., and Wormley, D.N., Air Cushion/Compfessor-Duct Dynamic Interactions, Journal of Dynamic Measurement and Control, Vol. 97, Sept. 1975 pp. 283-292. Goldschmied, F.R. and Wormley, D.N., Frequency Response of Blower-Duct-Plenum Systems, Journal of Hydronautics, Vol. 11, Jan. 1977, pp. 18-27. Thompson, W.C., Boghani, A.B., and Leland, T.J.W., Experimental and Analytical Dynamic Flow Characteristics of an Axial Flow Fan from an Air Cushion Landing System Model, NASA TN D8413, July 1977. Hinchey, M.J. and Sullivan, P.A., Duct on the Stability of Plenum Air Cushions, Journal of Sound and Vibration, Vol. 60, Sept. 1978, pp. 87-99. Hinchey, M.J. and Sullivan, P.A., Duct on the Dynamic Fan Characteristics of Air Cushion Systems, Journal of Hydronautics, Vol. 13, Jan. 1979, pp. 28-29. Hinchey, M.J., Heave Instabilities of Amphibious Air Cushion Suspension Systems, Institute for Aerospace Studies, University of Toronto, Report No. 246, Nov. 1980. Hinchey, M.J. and Sullivan, P.A., A Theoretical Study of Limit Cycle Oscillations of Plenum Air Cushions, Journal of Sound and Vibration, Vol. 79, Nov. 1981, pp. 61-78. 17 Graham, T.A., Effects of Skirt Material Choice on the Stability of an Air Cushion, Institute for Aerospace Studies, University of Toronto, M. A.Sc. Thesis, Oct. 1980.