The present paper contains the test results of a planing catamaran model. The aim of the tests was to study the effect of hydrofoil in these types of crafts. First, experiments were carried out on the bare body (i.e. without hydrofoils) to obtain non-dimensional hydrodynamic resistance coefficient versus speed. Then, the model with hydrofoils, by various locations and attack angles were subject...

The influence of a bulb runner blade hydrofoil shape on flow characteristics around the was studied. Experimental work performed turbine measuring station and single in cavitating tunnel. In cavitation tunnel, visualization hydrofoil’s suction side. Cavitation structures were observed for several numbers. less intense modified than original hydrofoil, delaying onset by tenths number. results tu...

Wakes of towed and self-propelled bodies moving in stably stratified flows are of relevance to environmental and ocean engineering applications. To date, the majority of studies focused on the wakes of spheres and cylinders in stratified flows. Stable stratification modulates the wake dynamics, leading to a significantly different flow compared to non-stratified wakes. The wakes of spheres and ...

Hydrofoil assistance on a catamaran model was tried twenty years ago and an unexpected resistance improvement of 40% initiated the creation of a research project to investigate the effect. Today the research project is still active inspite of designs and model tests resulting in the construction of over 200 Hysucats. Theoretical efforts to determine the hydrodynamics of the Hysucat principle re...

.............................................................................................................. ii ACKNOWLEDGMENTS ........................................................................................ iii TABLE OF CONTENTS.......................................................................................... iv LIST OF TABLES....................................................

We present experimental data for an ankle exoskeleton that provides a metabolic benefit during running. Intuitively, there is an optimal level of power that any particular human can accept and use to benefit walking or running, which is a function of the particular human, the selected gait, and speed. We provide and discuss modeling optimization results to complement our recent data for the dev...

Negidal is a Northern Tungusic language closely related to Evenki with two recognized dialects, Upper and Lower Negidal. This nearly extinct language used to be spoken in the Lower Amur region of the Russian Far East by people whose traditional way of life was based on fishing and hunting. While the number of remaining active speakers of Upper Negidal was more or less known, the current state o...