{"refrec":{"BRefID":136238,"RR":"<b>de Haan, D.</b> (1993). The upgrading of a Mermaid underwater vehicle. <i>ICES Mar. Sci. Symp. 196</i>: 140-142","BEntID":130084,"PublicFlag":1,"CheckedFlag":0,"wosflag":null,"vabbflag":null,"RefStringPartII":". <i>ICES Mar. Sci. Symp. 196</i>: 140-142","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"de Haan, D.","OrigTitleTranslFlag":0,"Authorstringtrunc":"de Haan, D.","Englishabstract":"Dutch research on development of direct observation techniques started with the purchase of an underwater towed vehicle of type \"Mermaid Explorer\" in 1985. Targets for further development were observation of a wider range of fishing gears, with speeds up to 7 knots, and inspections of the marine environment requiring low-speed operation. A feasibility analysis showed the potential of an increase in magnus rotor performance. 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