Aftermath of Korean War had forbidden public access to the most part of the nations coast until 1988 Seoul Olympic Games. Until now some strategically sensitive beaches are still inaccessible and marine leisure and sports activities are considerably weaker than those based on the land. However, it is foreseeable that the growth of Korean economy and introduction of the 5 days a week working system will accelerate the growth of marine leisure activities and businesses. In an effort to promote marine activities, recently a high speed powerboat made of fiber-reinforced plastics for family use has been developed with funding from the Ministry of Maritime Affairs and Fisheries of Korea. The resistance characteristics of the boat have been tested at the towing tank of the Seoul National University. A lightweight cantilever type towing carriage has been installed on the towing tank. The wireless devices appropriate for data acquisition during high speed towing tests have been devised also and the integrated system has been validated through a series of comparative tests. With the new carriage system, a series of model tests have been performed to investigate the hydrodynamic properties of the powerboat and compared to the sea trial results.