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  #41  
Old 07-21-2013, 08:10 PM
Peasant
 
Join Date: Jul 2013
Location: Lennox Head, NSW, Australia
Posts: 31
Default Re: First time 41" clay/homebrew oven.

Thanks Dave, I got some heat beads and some firelighters anyway. These ones don't smell but I don't think I have smelt a fire lighter since I was about 12 so they may have changed a bit

I have just been watching a bit about the top to bottom fire on YouTube. Thanks for the tip. It seems if it works it takes away the job of the person lighting the fire. Just set and forget.

I currently have a tomato tin drilled full of holes simulating one of those heat bead chimneys. Its full of heat beads (only about 5)with a firelighter in the bottom. It seems to be working. If that fails I'll put a sardine tin with a little "metho" underneath the tin and try again.

Last edited by sandybits; 07-21-2013 at 08:13 PM.
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  #42  
Old 07-21-2013, 11:51 PM
Peasant
 
Join Date: Jul 2013
Location: Lennox Head, NSW, Australia
Posts: 31
Default Re: First time 41" clay/homebrew oven.

I went to the next size up tomato tin (800 grams), drilled it full of holes and chucked 3 fire lighters in it plus about 10 heat beads.

It ended up being a tiny fire and only really warmed up about 300mms each side of it. The dome just above the beads (about 100mms) was about 180 degrees C. The same spot on the outside of the dome was around 40 degrees C.

I've just put the door in to see what happens.
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  #43  
Old 07-22-2013, 02:56 AM
cobblerdave's Avatar
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Location: brisbane australia
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Default Re: First time 41" clay/homebrew oven.

Quote:
Originally Posted by sandybits View Post
I went to the next size up tomato tin (800 grams), drilled it full of holes and chucked 3 fire lighters in it plus about 10 heat beads.

It ended up being a tiny fire and only really warmed up about 300mms each side of it. The dome just above the beads (about 100mms) was about 180 degrees C. The same spot on the outside of the dome was around 40 degrees C.

I've just put the door in to see what happens.
Gudday
That spot on the outside of the oven should be the ambient temp. I'm pretty sure 40 C is not Vic temp at this time! That's the moisture transferring the heat through. 100 C water boils , 1 ltr water equals 1600 ltres of steam .... Slowly Slowly . The heat will gradually move that water out. If you force it....
Regards dave
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  #44  
Old 07-23-2013, 05:22 AM
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Default Re: First time 41" clay/homebrew oven.

Gudday
Do you think that coffee tin is only concentrating the heat in one spot on the top of the dome? Might be worth a try in spreading the fire in an open tray. In the way the heat should radiate out the walls as well instead of just the roof.
Just a thought what do you think?
Regards dave
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  #45  
Old 07-23-2013, 12:44 PM
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Default Re: First time 41" clay/homebrew oven.

Quote:
Originally Posted by cobblerdave View Post
Gudday
Do you think that coffee tin is only concentrating the heat in one spot on the top of the dome? Might be worth a try in spreading the fire in an open tray. In the way the heat should radiate out the walls as well instead of just the roof.
Just a thought what do you think?
Regards dave
I agree, I think you should spread the fire out. The hardest parts to heat are the base of the dome and under the floor. If you have your fire on a tray you can still move it around to different parts of the oven. As well as the heat beads, start throwing on a few finger sized sticks.They will help keep the heat beads alight without causing out of control flame.
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  #46  
Old 07-23-2013, 05:30 PM
Peasant
 
Join Date: Jul 2013
Location: Lennox Head, NSW, Australia
Posts: 31
Default Re: First time 41" clay/homebrew oven.

Thanks guys. I did end up tipping the beads out. I saw some steam coming out of the insulation layer so moved them to another spot.

The pile of beads was too small though. I think I was being to "cheap" and didn't want to use of the $10 bag of beads in one go.

I put the door on the oven but the areas away from the beads only got a few degrees above ambient.

I don't so few beads did a lot. However the little bit of steam coming out the back suggest that it moved some water, I guess.
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  #47  
Old 07-27-2013, 06:42 AM
Peasant
 
Join Date: Jul 2013
Location: Lennox Head, NSW, Australia
Posts: 31
Default Re: First time 41" clay/homebrew oven.

I went against the grain and built a fire that has kindling criss crossed over a couple of larger logs (the against the grain bit is that I have always been a teepee guy, very fine tinder into kindling, into twigs, sticks, branches, etc - all manual) with a firelighter underneath.

I've got to admit I think my fire lighting techniques have changed from this experiment. It was a little too easy to do this way - although I have only tried it twice. But every other small fire I tried t get going in this oven didn't work.

I also took some picture and some temperature measurements. I post them here for no other reason then someone yelling, "crikey, that's not right!"

The first photos show the finished oven'
The next 2 show the little fire /small temps' and
the last 2 show damage to the undercover area. Whoops.
Attached Thumbnails
First time 41" clay/homebrew oven.-1-img_1889.jpg   First time 41" clay/homebrew oven.-2-img_1891.jpg   First time 41" clay/homebrew oven.-3-img_1893.jpg   First time 41" clay/homebrew oven.-4-img_1896.jpg   First time 41" clay/homebrew oven.-5-img_1897.jpg  


Last edited by sandybits; 07-27-2013 at 07:53 AM.
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  #48  
Old 07-27-2013, 07:55 AM
Peasant
 
Join Date: Jul 2013
Location: Lennox Head, NSW, Australia
Posts: 31
Default Re: First time 41" clay/homebrew oven.

Here re the temps. I hope they make sense.
Attached Thumbnails
First time 41" clay/homebrew oven.-pizza-oven-temps.png  
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  #49  
Old 07-27-2013, 03:03 PM
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Default Re: First time 41" clay/homebrew oven.

Those last two pics of the effects of the heat from the flue made me laugh.....
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  #50  
Old 07-28-2013, 05:24 PM
Peasant
 
Join Date: Jul 2013
Location: Lennox Head, NSW, Australia
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Default Re: First time 41" clay/homebrew oven.

Quote:
Originally Posted by brickie in oz View Post
Those last two pics of the effects of the heat from the flue made me laugh.....
Me too. I expected it but thought I'd give it a run and see what happened. Now I know.
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