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Just an idea I`ve thought of here: Any ideas about having a "Direct Methanol Fuel Cell" where methanol is converted directly to hydrogen that fuels the fuel cell to produce electricity on demand mutch the same way as a battery, I do not know of any subs that run this system but it could be a steppingstone for personal subs to get operation times of days or more on a single methanol tank. These units have been available mostly for experimental applications but the fuel cells nowdays are both compact and efficient. I do not know how these fuel cells behave in othe than in one atmosphere pressure but to have it outside the pressure hull in a compensated air filled container. I came up with this just now, I dont know if it is even possible to have them in pressure compensated containers (They do consume both oxygen and Hydrogen tp generate electricity) Helge N |