O.K. Does anyone on this forum have a twin engine single shaft vessel, or does the fact that Nordhavn does not make one, take the idea out of contention? -- ======================================================================= L. Bruce Jones U.S. SUBMARINES, INC. President POSEIDON UNDERSEA RESORTS LLC Tel: 208/687-9057 Fax: 208/441-7478 E-mail: bruce@ussubmarines.com http://ussubs.com http://poseidonresorts.com "Design, engineering and construction of submarines and submersibles" "Developing the world's first sea floor resort." =======================================================================

I don't think the fact that Nordhavn does or does not make them should change the subject. The real question is whether such beasties exist in the wilds of trawler-dom and whether they work. I've never seen one. The info Ken Williams passed along was interesting... that PAE's experience with 500 or so boats says that bad fuel and fouled props share the blame nearly equally for taking the main engine down for extended periods. I'd always assumed a fish net on the main prop would be curtains for the wing, but the wing prop is mounted quite a bit further forward on most boats. If the net is wound up on the main and trailing, the wing could be OK. The fact that one of the boats on his Atlantic crossing ran for days on the wing (all the way to shore) with a fouled prop they couldn't clear is better performance than I'd expected. Not sure about other mfgs, but most Nordhavns have a sanitized fuel supply for the wing. Mine is about 10 gallons, and it can only be filled via the transfer pump (I can draw supply from any of the four tanks) which pumps through an isolated Racor with 2 micron element (different filter than the main engine uses). The supply from the wing tank is then run through a 10 micron Racor before it gets to the wing engine, which has a third on-board filter. Given that water gets separated in both Racors, I can't imagine a fuel problem that would escape all that filtration. Worst comes to worst, at a gallon an hour burn rate, that tank gives me ten hours to sort out a severe fuel problem before I have to refill it. Also, the wing engine is a stone-simple mechanical diesel (Toyota block Lugger) with manual morse controls, unlike the JD main engine that has Mathers fly-by-wire electronic throttle and transmission with computer ECU control. Its nice to have some proven, ancient technology on board to counterbalance all that electronic diesel wizardry. John Marshall ----- Original Message ----- From: "L. Bruce Jones" <bruce@ussubmarines.com> To: <passagemaking-under-power@lists.samurai.com> Sent: Tuesday, October 28, 2008 7:25 PM Subject: Re: [PUP] Ok, what is your thoughts about get home engines > O.K. Does anyone on this forum have a twin engine single shaft > vessel, or does the fact that Nordhavn does not make one, take the > idea out of contention? > -- > ======================================================================= > L. Bruce Jones U.S. SUBMARINES, INC. > President POSEIDON UNDERSEA RESORTS LLC > Tel: 208/687-9057 Fax: 208/441-7478 > E-mail: bruce@ussubmarines.com http://ussubs.com > http://poseidonresorts.com > > "Design, engineering and construction of submarines and submersibles" > "Developing the world's first sea floor resort." > ======================================================================= > _______________________________________________ > http://lists.samurai.com/mailman/listinfo/passagemaking-under-power > > To unsubscribe send email to > passagemaking-under-power-request@lists.samurai.com with the word > UNSUBSCRIBE and nothing else in the subject or body of the message. > > Passagemaking Under Power and PUP are trademarks of Water World > Productions, formerly known as Trawler World Productions.