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How to improve ventilation?

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Merinalle View Drop Down
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    Posted: 29 November 2008 at 17:50
 
Although there has recently been another interesting thread about ventilation:  (http://www.myhanse.com/forum_posts.asp?TID=2560&PN=1), I decided to open a new one because H320 and H370 are quite different. That doesn’t mean that this is only meant for H320 owners!
 
We didn’t had any enormous problems with the ventilation during the first summer; the worst thing was the smell of a new yacht when she had been closed for longer period. That problem will disappear in the future, but sometimes it may be nice to refresh the air for some other reasons, too. Another thing is that the hatches can’t be kept open at rainy days. So, I have some ideas for improvements, but would like to read comments and recommendations of more experienced boat owners. Briefly: How to make ventilation better, without sinking the boat!
 
Generally, my idea is to install two closable air ventilators on deck under the sprayhood - one for the aft cabin, and one for the head (a jargon word that obviously means marine toilet). In addition, I would like to have a fresh air inflow from outside to the backward room, preferably boosted with a manually controlled electric fan. More detailed:
 
1. Deck ventilators
 
Suitable places for the deck ventilators are obviously the areas where the additional hatches would have been fitted by Hanse. That is, beside the main winches. (See pic from a boat of a friend of mine, we don’t have those hatches.)




I suppose the halyards should not make trouble, because there seems to be enough space there. My experience is that mostly the area is quite dry, too, thanks to the sprayhood. On some circumstances, however (and only when sailing), waves will cut over this area. That’s the reason why the vents should be closable.
 
There are several makers and types of vents, but I like the type Popeye linked with his message in the earlier mentioned H370 thread. Unfortunately I don’t understand the Mongolian language, but I loaded a Vetus catalogue with similar products: www.vetus.com - “Please choose your language” – Products – Digital Catalogue. On page 109, there are the “Mushroom ventilators”. (See pic.)



I like that type because they have quite large free flow area compared with the outer diameter. Another benefit is that it may be possible to see if the vent is open even when you are behind the wheel and notice that waves splash over the ventilator.
 
2. Fresh air inflow
 
For a long time I have wondered how it could be possible to make the fresh air flow throughout the boat, while all the openings are on the deck? (I have removed the log transducer for winter period, but that it is not a suitable solution for the summer season.)
The air should be somehow conducted from outside to the lower parts of the yacht. Once down there, the extra air can surely find way out through companionway, open hatches, and our brand-new deck ventilators, wouldn’t it!
 
There is the engine room air ventilation system on the port side; maybe something like that could be used as a model? Might it be possible to install an inlet vent somewhere in the stern area, connected with a tube to the room behind the aft cabin?  To prevent water coming in, the air tube could make a loop as high as possible under the backseat. Is that kind of solution safe enough? Some kind of fan might be needed, too, to make the system effective. From there, the air should flow to other areas through the aft cabin, portside compartment, and the mid-area channel under the berth. But, some details are a little confusing:
 
Where to install the air inlet vent? Is there a suitable air inlet vent type that lets air in but prevents water to enter the boat? What kind of fan you would recommend for this purpose? Why it is so that I have never seen or read about any solution like this to improve yacht ventilation? Should I patent my unique idea instead of sharing it through internet? Is there any limitation how many question marks are allowed in one thread…?Big%20smile
 
I understand that this is quite complicated topic, and maybe a native  English speaker could formulate the questions more clearly. Anyway, I hope you would share your opinions. Thanks in advance!
 
320#166
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coriolis2 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote coriolis2 Quote  Post ReplyReply Direct Link To This Post Posted: 30 November 2008 at 17:20
Just after sailing the boat home from the former Dutch dealer, I’ve decided to drill some holes in the rooftop for two Plastimo vents. After one season this worked out fine. When away from the boat we point one vent to the (prevailing) wind direction and the other one from the wind. This ensures natural venting in the boat. After one season the polyester smell is almost gone. While on the boat and in harbor on rainy and windy days we keep everything closed, relying on the 2 vents.
Regards, Rob
"Coriolis" H350 #045 (ex Waarschip 570 #? 1987/1992, ex Waarschip 28LD #7 1994/2007)
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Peter-Blake View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Peter-Blake Quote  Post ReplyReply Direct Link To This Post Posted: 30 November 2008 at 17:24
Looks like a very good solution
Blake 370
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Gregor View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Gregor Quote  Post ReplyReply Direct Link To This Post Posted: 30 November 2008 at 19:33
Looks very nice. Have to give it some thoughts myself.

Gregor
Uisge Beatha

Currently sailing Dehler 36 JV (2002)
Previous boat: Hanse 311 #80

http://www.uisge-beatha.eu
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shaukaas View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote shaukaas Quote  Post ReplyReply Direct Link To This Post Posted: 02 December 2008 at 07:27
These Vetus Plastimo vents looks like a good solution; I'm looking forward to se pictures of these installed on a 320. Big%20smile

Also, I've been wonderring on where the inlet-air for the engine compartment enters the boat? There is no obvious vents... Both the Engine compartment fan, the Yanmar and the Eberspächer sucks air from the motor compartment - with both running on maximum a whole lot of air has to be replaced somehow? Confused

Also the battery compartment has a lack of ventilation; I'm planning to install a high power regulator for my Hitachi generator, which will generate some gassing from the batteries. It would be prefferable to get this gas out of the boat - not trap it inside the saloon... Is this not regulated through the CE/Germanisher Lloyd certifications? Any good ideas?


Edited by shaukaas - 02 December 2008 at 07:30
S/Y Nadun - Hanse 320#171
LG3600 - NOR13510

www.hanseklubben.no
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shaukaas View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote shaukaas Quote  Post ReplyReply Direct Link To This Post Posted: 05 December 2008 at 10:39
Are there no further suggestions or thoughts on this subject? Ermm
S/Y Nadun - Hanse 320#171
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copain View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote copain Quote  Post ReplyReply Direct Link To This Post Posted: 05 December 2008 at 13:23
I think I just found the solution to get the ventilation a bit better on our 350.
It will only do 100m3/sec, so I suppose for a larger boat you would have to pick a more powerfull one.
Will let you know how the installation progresse


Regards, Willem
s/y Copain (Beneteau 281)
from march 2008 Hanse 350 # 061
Visit my BLOG op http://www.wsv-haringvliet.nl/blog/maatje/
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Scorpio View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Scorpio Quote  Post ReplyReply Direct Link To This Post Posted: 05 December 2008 at 13:44
If you're planning to race your boat don't forget to get it reweighed after the installation - your EW (Empty Weight) will have gone up so it should help your rating.
 
If you put a diverter valve in the output flow, you could divert the output over the transom in light airs and outperform other boats in those conditions.  Alternatively the input could be through a scoop on the foredeck and it might suck you upwind?!
 
My only slight concern is with the power consumption.  Can you get a waterproof three phase shore power connection long enough?
 
Big%20smileBig%20smileBig%20smile
 
Ed


Edited by Scorpio - 05 December 2008 at 13:44
Ed Essery
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Hanse 342#465 - Solent Based
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Gregor View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Gregor Quote  Post ReplyReply Direct Link To This Post Posted: 05 December 2008 at 13:53
Whow, put in a small heater spiral at the output and I have a well heated boat so I can sail whole winter too!!! I think the lady likes it as well LOL
LOLLOLLOL
 
Gregor
Uisge Beatha

Currently sailing Dehler 36 JV (2002)
Previous boat: Hanse 311 #80

http://www.uisge-beatha.eu
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Peter-Blake Quote  Post ReplyReply Direct Link To This Post Posted: 05 December 2008 at 15:06
We have been working all day. We got it done. The new airvent invented by copain is installed on a brand new Hanse
Only problem was: it did not fit on the coachroof, so we had to mount it around the cockpit. The nice thing is: We found enough place for 2 of them.
 
 
You see on the foto our team of specialists while mounting the new system. Wink
 
But now we have a problem, we need to install a new cockpit.There is no place for the sailors anymoreConfused
 
Just saw that we worked on the boat / avatar from bjoris. Sorry for using your foto and boat. Hope you can live with this improvement
 


Edited by Peter-Blake - 05 December 2008 at 18:21
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