The purpose of this work was to investigate the application of pump jet propulsion and yaw angle stabilization fora landing craft going through the surf. Linear theory was usedthroughout the analysis of the control problem. The stabilityindices and derivatives were determined in part by experimentand the remainder by analytic techniques. It was found that LCVP landing craft are dynamicallyunstable without a skeg. Stability could possibly be restoredby a feedback control system, but the far more practical solutionis to start with a dynamically stable craft. This willprovide the craft with a greater margin of stability in all cases. Although it is felt that the craft can not be satisfactorilyused without a skeg, much of the analytic data in Appendix Amay be used to cover the case with a skeg. Reference (3) containsthe appropriate modifications needed for the changes.
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