Axial Waterjet (AxWJ) Model 5662 and Mixed-Flow Waterjet (MxWJ) Model 5662-1: Comparisons of Resistance and Model-Scale Powering with Propulsion Nozzle Designs

This report is a partial documentation of two series of model-scale experiments conducted 5/07-6/07, comparing the Axial Waterjet (AxWJ) Model 5662 and the Mixed-Flow Waterjet (MxWJ) Model 5662-1, two waterjet propelled variants of the Joint High Speed Sealift (JHSS) hull platform. This document contains calm water resistance and model-scale powering test results. Bare hull effective powers at three displacement conditions, and appended effective powers at design displacement, were determined and compared for the two waterjet variants, and then compared to the JHSS baseline shaft and strut (BSS) hull. Model-scale rotor force measurements were recorded and compared for both the AxWJ and the MxWJ under power. These tests were conducted on both models with waterjet nozzles specifically designed for propulsion. A detailed powering analysis derived from the AxWJ and MxWJ model resistance and rotor force measurements, as well as LDV velocity measurements and pressure tap measurements, will be reported in a separate document. This future document will address full-scale AxWJ and MxWJ powering predictions and comparisons to the JHSS baseline BSS.