|Topic Review (Newest First)|
|01-02-2009 08:20 PM|
|Bilgewater||Well, this is great information. I'm going to try the shield on mine when I get back to the coast next week. You must have a different heater than mine. I don't think I have an ash tray and wing nut but now I'm not sure and I'll have to take a closer look. Mine has a fan at the bottom of the heater pointing up with a fan controller on the side.|
|12-31-2008 03:59 PM|
Well I tried it last night.
I picked up not an H cap, but more of a spear type cap from Second wave here in Seattle.
I can't say it was a huge gain, but it was better.
I had been thinking about fabbing up a shield too, so I grabbed some scrap sheet metal and made a round shield that sits about 1/2" around the DP cap and extends 1" above and below. I put that cap back on and it did work better but I was still getting a flame that was unhappy. It was not a flame that went up, but more of a confused flame. The shield is not pretty, but did the job as an experiment.
The guy at Second Wave uses a solid stove. He said I might not have enough fresh air coming in. After testing various ports I couldn't say that helped any.
Then, I found a fix!
My stove has an ash tray below the fire box. The base of the fire box has holes for incoming air. The idea was the air travels through a channel and into the ash tray, then up into the fire box and up the flue. The ash tray is held in place by a single wing nut. By simply loosening the wing nut I was able to get more incoming air and a nice flame.
As you probably know we had 43mph winds here in Seattle and I had no back drafts! The shield for the DP round cap made a huge difference, but more incoming air was paramount.
I hope this is of some use for others in the future.
|12-31-2008 02:40 PM|
I haven't done this yet, I've been away from the boat for a few months. But I am going to try this soon.
You have less pipe than I do and the more pipe the better according to Dickinson. I now keep the fan under the burner going on the low setting full time when the wind is high and this improves it a lot.
The H cap is not designed properly in my opinion. I had this on a previous heater and had problems with rain getting into the burner bowl. The rain comes in the upright H usually at an angle, hits the horizontal centre of the H and runs along this and down the pipe and into the burner bowl. The bottom of the horizontal square tube should be angled down toward the H uprights so the rain can't drip in. The way it is designed with 2 straight rectangles it is a real problem out here on the wet coast and I don't see too many of them being used. I also had back draft problems with this design but it was a different stove with a much smaller diameter pipe.
I would think that adding the extra 22" of pipe you have would solve it but it would stick up pretty high. I do know that a lot of the fish boats around here with long pipes seem to have no problem and they go out in all kinds of weather.
|12-30-2008 12:59 PM|
Have you had a chance to make/try the DP cap shield yet? I'm getting backdrafts too often in 15+ winds and the stove is useless in 20+.
I have 22" of straight pipe, then another 16" in a gentle curve inside the boat. I have a 22" extension piece that I'll use when at the dock capped off with the DP cap.
I've tried to use foil to cover the windward side of the cap, but that is of little benifit. I'm at a crossroads of either trying the H style cap, or making a DP cap shield.
your, or anyone's experiance would be nice. I can add another 22" pipe above deck if needed too.
|10-21-2008 06:48 PM|
|Bilgewater||I don't have the heatex on mine, I seem to get enough heat without it. I have a damper and I do get backdraft problems occasionally. The guy in the fishboat in front of me had this problem and Dickinson told him to add a length of pipe and although it helped a great deal, he still has problems in higher winds 20+ knot but it's usually difficult to increase the length of the stack on a sailboat. I have the DP style exhaust cap and I'm thinking about cutting a short piece of SS flue pipe about 5" high and 8" in diameter and install that around the cap using spacers to hold it in place and hopefully this stops the wind from hitting the vent slots directly.|
|10-21-2008 03:23 AM|
I also have the Alaska model. I was wondering, did you by chance add a heatex unit? I know most of my heat is going up the stack and am considering getting this unit or making my own heat exchanger.
I've also had a few backdraft events even though I did add the recommended barometric damper. Have you had any problems like that?
|10-20-2008 10:26 PM|
Originally Posted by Mirari View Post
That's a good idea, I think I'll try this. According to the specs. from Dickinson they use about twice what I thought they would use.
|10-20-2008 07:21 PM|
You're very welcome, Steve.
That looks like a nice diesel heater.
We have a propane Dickinson Newport -- but our climate is more mild than yours, I think!!
|10-20-2008 07:19 PM|
|Bilgewater||Thanks very much John, that info didn't come with the Dickinson so I assumed it didn't exist.|
|10-20-2008 07:19 PM|
|Mirari||To get a real accurate reading on what your Alaska Stove is burning I would take the removable parts out of the burner and mop up any diesel in the burner. Then turn on the fuel control to the setting you normally burn in and start a stop watch. Allow it to flow until you have a few onces of diesel. Shutoff the fuel and stop the watch. The most accurate way to now measure this amount of fuel is to use a small accurate scale and measure the weight of a dry paper towel and the weight of the towel that has absorbed all the diesel. Do a little math and you will have your consumption rate.|
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