Shipmate are those really reliable.

[JoshuaIII]

So we got our shipmate 211 since a few months, now it's getting colder and windy so we crank it up more often.

Our shipmate is installed with 15ft of straight pipe (4" brand new) going above the roof with a damper closer to the stove. I even get a new smoke hood like this one installed to it:
http://www.marinestove.com/3_and_4_smokeheads.jpg

In a day like today when it's windy (25knots + gust), even with the chimney hot I got some really bad backdraft. So bad that I need to shut it down and leave the area for a few hours as too much smoke. I do not have the problem with my other stove(big) in the same room that have a regular house smoke hood, or in the house at 30 seconds from there.

Those these stove are really reliable, or it's the kind of stove you can only use in a marina when there is not too much wind. As on the boat with 4ft of chimney it won't get any better...

Thanks...

[Thad]

That's the stove I have in SEA HARMONY. Never had that problem. Direction of wind, downdraft from nearby structure? Maybe that smoke head impedes draw too much but it shouldn't. Have you opened the flue deflector? Good luck.

[Garret]

I can't speak to the Shipmate - but I've never seen a downdraft problem in a woodstove that wasn't the fault of the chimney: too short, not enough height over a neighboring structure. too restrictive a cap, etc.

Can you try it without the cap for a while & see if you still have the same problem?

Also, it should be noticeably taller than any nearby obstruction. On a house wood stove, the rule of thumb is at least 2 ft. taller than anything within 10 ft. (IIRC).

[JoshuaIII]

Thanks Thad,
the wind is from the North right now right where the chimney is exposed (But at sea will be the same problem right?) about gust of 30 to 35 knots.... I've try to shorten the pipe, put it out of the wall etc... Something like 10 differents ways but when it blow hard I have the same issue...

I only have a damper, flue deflector highly recommended?

It seems to me that the pipe is too big for the fire going on inside...

[JoshuaIII]

I can't speak to the Shipmate - but I've never seen a downdraft problem in a woodstove that wasn't the fault of the chimney: too short, not enough height over a neighboring structure. too restrictive a cap, etc.

Can you try it without the cap for a while & see if you still have the same problem?

Also, it should be noticeably taller than any nearby obstruction. On a house wood stove, the rule of thumb is at least 2 ft. taller than anything within 10 ft. (IIRC).

Thanks Garret, I've always thought so too this is why I ask... I've tried smaller pipe, longer, different cap and invested on that cap thinking it will fix my problem... I feel the wind coming in the stove really well before even starting the fire, and the chimney have problem to warm up as the fire is going down when there is gust...

A real PITA... What's your installation for the shipmate, will try the same who know....

[JoshuaIII]

Ok I think I've put my hand on it... I was also talking with Andrew from Marinestove.com...
Seems like he figure out as I've changed this and it look to work... Will see in a day or two...

The problem was that the building is build on bare ground (To build the boat), when it's blowing hard wind find it's way under the building and create a different pressure into the room. The chimney then act as a air inlet for the room... Nothing to do with the chimney....

I just corked the area where the wind is coming the most and it seems to work well now... Or maybe it's my 5 minutes lucky strike ;)

[htom]

Two chimneys can do the same thing, one acting as an intake to the other's exhaust.

[JoshuaIII]

So if I understand... If you are at a anchorage and it's nasty outside facing the wind...

If you leave the companion way open it will suck the air up of the inside and create a backdraft on the stove, or if you close the companion way and open the hatch, it will make the stove burn harder as too much pressure inside the vessel??

[Paul Pless]

QUOTE=JoshuaIII;3151147]Our shipmate is installed with 15ft of straight pipe [/QUOTE]Your boat must be quite a bity large than I was at first envisioning. . .

[JoshuaIII]

QUOTE=JoshuaIII;3151147]Our shipmate is installed with 15ft of straight pipe Your boat must be quite a bity large than I was at first envisioning. . .[/QUOTE]

Hey Paul... It was first a 4 ft pipe... With same problem... That was the fifth or sixth attempt with different configuration...

[Thad]

The flue deflector is in the stove. A little push pull tab, iron, above the oven. In, it is open for getting the stove going and the chimney drawing, out, the flue runs around the oven and up the back heating the whole stove better especially the oven. I don't know a proper name for this damper.