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nyara
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Gravity Feed

Post by nyara » December 11th, 2019, 9:52 am

Hello,
My name is Nick, I've been competing in BBQ since 2015 and have build several smokers over the years. I just recently purchased the double pan gravity feed smoker plans. Can anyone tell me what they know about this smoker if you have built one, and my biggest question is; How long will it burn for at 250 when full of charcoal?



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Re: Gravity Feed

Post by JKalchik » December 11th, 2019, 11:19 am

Burn time will depend a little on ambient conditions and your fuel, but I generally get 12-15 hours out of a full chute of natural lump.


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Re: Gravity Feed

Post by Big T » December 11th, 2019, 5:57 pm

Welcome aboard!!


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Re: Gravity Feed

Post by u081863 » December 11th, 2019, 8:52 pm

I built one for our pipe shop so we use it indoors. I've never burned it longer than an 8 hr shift but I feel it would burn for the 12-15 hrs mentioned above. What I've learned is that lump charcoal burns 50 degrees less than briquettes with less ash. The temperature from the bottom rack to the top rack is approximately 30 degrees, I haven't experimented yet but I think if I close the outlet vent some I can decrees that difference. Once it comes up to temp it holds steady, average 225 - lump / 275 - briquettes. I've had it to 350 with supplied air.



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Re: Gravity Feed

Post by Pete Mazz » December 12th, 2019, 5:14 am

Welcome


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Re: Gravity Feed

Post by ajfoxy » December 12th, 2019, 3:02 pm

Welcome.


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Re: Gravity Feed

Post by Frank_Cox » December 14th, 2019, 5:56 pm

welcome aboard!!


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Re: Gravity Feed

Post by JKalchik » December 14th, 2019, 11:12 pm

JKalchik wrote:
December 11th, 2019, 11:19 am
Burn time will depend a little on ambient conditions and your fuel, but I generally get 12-15 hours out of a full chute of natural lump.
Today's data.... 20 lbs. of B+B lump dumped in on top of the remnants of an overnight fire at 0400, around 16 F ambient, still burning 17 hours later, -2 ambient, at around 225 F chamber temp. I expect this to be atypical, as it appears I have a problem with ash buildup in the opening between the firebox flue & cook chamber.


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Re: Gravity Feed

Post by Frank_Cox » December 15th, 2019, 2:49 pm

JKalchik wrote:
JKalchik wrote:
December 11th, 2019, 11:19 am
Burn time will depend a little on ambient conditions and your fuel, but I generally get 12-15 hours out of a full chute of natural lump.
Today's data.... 20 lbs. of B+B lump dumped in on top of the remnants of an overnight fire at 0400, around 16 F ambient, still burning 17 hours later, -2 ambient, at around 225 F chamber temp. I expect this to be atypical, as it appears I have a problem with ash buildup in the opening between the firebox flue & cook chamber.
Good data, I’ve been trying to keep up as best I can with some of the posts about this. We are looking at ways of improving what we currently show on the plans for cooking grates. If anyone wants to post pictures or give ideas, that would be much appreciated! As we get time we’re trying to go back and fix some things that people find on the plans to make them easier to use.


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Re: Gravity Feed

Post by JKalchik » December 15th, 2019, 3:22 pm

A removable grate! Without a removable grate, I'd be turning this thing into scrap.


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Re: Gravity Feed

Post by Frank_Cox » December 15th, 2019, 4:46 pm

got ya. we started showing that on the mini and the kits. thinking the bars would be better if they were square bars 1/2x1/2 twisted 45° with corner up. thoughts?


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Re: Gravity Feed

Post by mp4 » December 15th, 2019, 4:57 pm

Frank_Cox wrote:got ya. we started showing that on the mini and the kits. thinking the bars would be better if they were square bars 1/2x1/2 twisted 45° with corner up. thoughts?
I'll have to try this. I have to rattle mine every few hours and it's made with round stock.



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Re: Gravity Feed

Post by Frank_Cox » December 15th, 2019, 5:10 pm

yeah, I would recommend keeping the gap shown on the plans between the closest points of the bars. ya might still need to rap on it once in a while but it should help, the other thing ya might try is using 1x1x1/4 angle in the same manner? or even flat 1x1/4 bar on edge and make a slightly wider gap? Plan on trying all 3 when we have time


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Re: Gravity Feed

Post by JKalchik » December 15th, 2019, 5:52 pm

I made my grate out of the rebar called out in the plans, with 1/2" spacing. I've been meaning to weld up a new grate with 3/4" spacing. 1/2" spacing does require giving the grate a good shake every 20-40 lbs. of lump.

Hrrrm... I was thinking that I wouldn't want to use angle iron for the grate..... then I realized that you mean using the angle point up, with the flats at a 45 degree angle. Interesting idea. That's definitely worth trying, it'd certainly work better than a flat surface, and maybe better than round stock.


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