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Bob in Mo 09-20-2012 11:24 AM

Arch Design Help
 
4 Attachment(s)
Newbie here start a design. If you would, take a look at the attachments. There are 2 arch designs. Please give me your opinions.
Thanks

Les 09-20-2012 12:12 PM

Re: Arch Design Help
 
I would go with the shorter one. No need to make your reach longer than necessary.

UtahBeehiver 09-20-2012 12:18 PM

Re: Arch Design Help
 
1 Attachment(s)
I agree too with the shorter one. Here's a pic of mine. I did add a decorative arch on the front too.

jeeppiper 09-20-2012 02:28 PM

Re: Arch Design Help
 
1 Attachment(s)
One thing to think about is airflow and how smoke/soot comes out of the oven chamber itself. I cant say for sure, but my gut tells me that your hole/slot in your arch might be small.

I have watched my chimney and noticed that it "breathes" in-and-out depending on the wind conditions.

I designed in a "settling chamber" for the smoke to enter before it goes up and out the chimney. This settling chamber acts to provide a staging area for the smoke to gather before it gets pulled up the chimney. If there is no wind, it really doesnt matter. But if there is the slightest wind, then this chamber works great. Attached is a rough picture of what I am talking about.

There are many pictures of ovens on the FB website with soot on the front. Also, you dont want smoke or hot air exiting the front of your oven.

Just something to consider....

Les 09-20-2012 05:29 PM

Re: Arch Design Help
 
Jeep - that is an interesting concept and I see where it would work. After a thousand more builds - these overs are going to be dialed in. The vent that Bob proposes is pretty much like what I have done, and yes, the wind WILL jack with the smoke.

Mistertoy 09-21-2012 04:41 AM

Re: Arch Design Help
 
2 Attachment(s)
I made mine like your shorter version also. You might want to consider shaping the inside of the arch (see attached photos) like a few people have done so then your transition of bricks onto the arch is both easy and neat. I was glad that I read through the forums and saw how others had taken that approach. It takes a bit of setting up and cutting but I think it is worth the extra work.

Brett

Laku 09-22-2012 10:05 AM

Re: Arch Design Help
 
1 Attachment(s)
Perhaps a short design for the entry but built similar to your first. Reason being the later design has a weak point in the vent chamber arch as it's not supported from both ends (see the picture).

This may or may not cause problems later on, but is a structural design flaw. As it's pretty easy to avoid I would not intentionally include that sort of flaw to the design.

david s 09-22-2012 06:38 PM

Re: Arch Design Help
 
As I'm a fan of casting I would recommend casting the whole entry. That way you can make the entry even shallower and create compound curves easily so you end up with the entry funnelling to the flue pipe for efficient smoke removal. It also has the advantage, if you make the casting thinner than the bricks, of less thermal mass which makes it less of an energy robber. It is quite simple to create a damp sand mould and trowel the castable mix over it. No complex brick cutting required.

Les 09-22-2012 07:51 PM

Re: Arch Design Help
 
Quote:

Originally Posted by Laku (Post 138997)
Reason being the later design has a weak point in the vent chamber arch as it's not supported from both ends (see the picture).

Laku,

I don't follow the "weak" issue. Many ovens have this approach (mine included ) and there is absolutely no problem - what am I missing?

deejayoh 09-22-2012 08:48 PM

Re: Arch Design Help
 
Quote:

Originally Posted by Les (Post 139025)
Laku,

I don't follow the "weak" issue. Many ovens have this approach (mine included ) and there is absolutely no problem - what am I missing?

+1

Looks like an arch to me.


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