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Oops, looks like my questions have already been answered :)
| doctor@pearsonwellnesscenter.com
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2007-02-27 16:09:00
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I had not thought about it, but you are probably right. My guess is that the decision to go twin engine mandated wet exhaust.
We did want to go with diesel electric, but Nordhavn decided they didn't want to do it on our particular boat. At the time they were in the process of building their first diesel electric boat, and wanted to get it successfully completed before starting another one.
My guess is that we are better off NOT to be a diesel electric boat. I do believe it will quickly become popular, but the first boats made are likely to experience a number of problems. Pioneering is not always good.
-Ken W
| Williams, Ken |
2006-05-21 09:57:50
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Ken
Thank you for the reply. I will, certainly, follow the progress of Sans Souci
further and am sure that this subject will come up again. Perhaps by this time
next year you will have some reliable data on what the effects are (if any).
Just one more question, though. I always thought Nordhavn use, as a principle,
wet exhausts on dual engine set-ups because retooling and redesigning would be
far to expensive for a dry exhaust. As you now say that you CHOSE the wet
system for your very own reasons, does that mean they would have built the boat
with a dry exhaust if that had been your choice?
Also, I remember reading that at one time you considered the diesel-electric
system. Would that be possible with a dry exhaust? Please forgive me if I am
asking questions that migth be impossible for you to answer. It is just that
this topic has intrigued me.
In September I will visit the Southampton Boat Show here in the UK and, of
course, go to the Nordhavn berth. I might even go to the sales office to see
all the other models they have there. Philip Roach was so kind to offer to show
me around. I can't wait. Having not steered a boat for 16 odd years all this is
a little premature but I have to say that ever since I discovered Nordhavn I
have been unable to get them out of my head. Who knows, one day ...?
In the meantime I wish you both happy cruising.
Peter
| Mueller, Peter |
2006-05-18 15:50:51
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Peter:
Here's what I know on the topic:
Everyone I spoke with seems to agree that dry exhaust is better. It's a simpler system, more reliable, and better for the engine. That said, when I spoke with the engine manufacturer they said (Steve Shultz - Lugger) that on modern engines it isn't such a big deal. He didn't think that the engine cared whether it was wet or dry exhaust.
The downsides of dry exhaust are: 1) You have an exhaust pipe running up to the top of the boat in a most inconvenient location (through the main salon, and in our case through the center of the hot tub), and 2) Dry exhaust engines, even with electronic ignition, can throw out soot sometimes.
We decided to go with wet exhaust because of the hot tub, and the lost space in the main salon.
I am worried about engine room temperature, and I'm also worried about the implementation of the wet exhaust. Nordhavn does the vast majority of their boats as dry exhaust. They do wet exhaust, but it certainly isn't a core strength. I've been pestering Justin (our project manager) with a stream of emails related to engine room temperature, and ventilation. I'm sure they'll 'get it right' but it's certainly something I'm worried about. Our having dual engines is also a complicating factor.
On the positive side, I've retained the captain of Nordhavn 72-02 as a consultant to help me with the engine room. 7202's engine room had roughly the same setup as ours, including the wet exhaust and dual engines. They had no problems with engine room temperature.
-Ken W
PS Sorry to be slow responding. We're cruising in the Bahamas for this entire month. We've been a week without internet, and probably won't have it again for another week. It's beautiful here, and our 27' power cat (Glacier Bay) is perfect because of its shallow draft. We ran 14 miles today across sand bars, with rarely more than three feet of water under us, and occasionally less! This was followed by a bumpy but fun 37 mile open ocean force 4 crossing to Nassau.
I saw a tee shirt today 'Work is for people who don't know how to fish'...
Next stop: the Exumas!
| Williams, Ken |
2006-05-15 23:16:45
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Nordhavn seems to favour dry exhausts and makes quite a big story out
of this in all their publications. In view of you, Ken, having twin
engines
and, therefore, wet exhausts (and also having read about Milt's (?)
problem with engine room overheating) I was wondering what the general
arguments of pro and con wet/dry are. What does make - if anything -
dry exhausts so much better/more desirable?
Peter
| Mueller, Peter |
2006-05-15 09:43:55
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