This paper presents a summary on a unique Surface Impulse Propulsion (SIP) device. The material is structured in three parts. The first phase involves the performance of a baseline marine SIP system, the paddle wheel. The second part addresses a modification to the baseline system. A loose web material is fitted between the paddle blade tips. When the interior of the wheel is pressurized the device behaves much like an extremely low pressure tire. A series of configurations of forward speed, wheel rpm, blade immersion depth, web length, and internal wheel pressure were tested. Application of the webbing material significantly improved thrust production. Two critical parameters were the ratio of web length to blade tip to tip distance and internal system pressure. Both influenced the losses common to such a system, water entrainment at blade exit and air entrainment in the blade cavities at blade entry. Improvements of as much as 500 % were seen in thrust coefficient for the best case, and significant performance improvement was noted over a wide range of parameters. The paper concludes with practical aspects of the SIP system.
Marine surface impulse propulsor
Oberflaechenimpulsantrieb fuer Schiffe
ASME-Papers ; 1-9
1983
9 Seiten, 20 Bilder
Conference paper
English
Investigation of a loose-webbed paddle surface impulse propulsor
Tema Archive | 1982
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NTIS | 1973
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