An Africa build

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Re: An Africa build

Post by Dirtytires » June 9th, 2018, 11:26 am

I am interested in the design on this...very unique. Thanks for the pictures!



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Re: An Africa build

Post by ajfoxy » June 9th, 2018, 5:55 pm

Yes it is a very interesting design. I can't wait to see the finished product to see how it all works.


Learning generally boils down to "Repetition or the avoidance of pain", some people learn by doing, some by watching and some just have to pee on the electric fence.

Whether you think that you can, or that you can't, you are usually right. Henry Ford

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Re: An Africa build

Post by Rodcrafter » June 9th, 2018, 10:16 pm

Yeah that!


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Re: An Africa build

Post by askari » June 10th, 2018, 1:53 am

Huge thanks for your interest guys it's really encouraging!

The design has consumed a lot of time and Feldon's calculator has been a real, real help (a big hat's off to that guy!).

The firebox is designed to be at 115% of optimum volume with the extra 15% volume being used for the airspace under the grate.


For the stack I worked out the volume for a row of square pipes that enter into the cooking chamber at various heights with the smoke being drawn over the top and around the sides to create a "smoke envelope" around the meat in a reverse flow layout.
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Re: An Africa build

Post by Rodcrafter » June 10th, 2018, 7:12 am

I thought you were at my desk for a second.

LOL


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Re: An Africa build

Post by askari » June 10th, 2018, 12:24 pm

Rodcrafter wrote:
June 10th, 2018, 7:12 am
I thought you were at my desk for a second.

LOL


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Re: An Africa build

Post by Rodcrafter » June 11th, 2018, 4:47 pm

LOL


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Re: An Africa build

Post by askari » June 13th, 2018, 10:03 am

Busy day!
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Re: An Africa build

Post by askari » June 13th, 2018, 10:06 am

The guys getting stuck in!
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Re: An Africa build

Post by Big T » June 13th, 2018, 5:55 pm

:LG:


Measure Twice.....Cut Three Times.

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Re: An Africa build

Post by Rodcrafter » June 14th, 2018, 12:15 am

Getting it done! Good job!

Someone is going to be in trouble for making such a mess on the patio. LoL


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Re: An Africa build

Post by Dirtytires » June 14th, 2018, 12:18 am

This has nothing to do with the build but what kind of trees are those off the patio? I’ve never seen them before...



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Re: An Africa build

Post by askari » June 14th, 2018, 12:54 am

Dirtytires wrote:
June 14th, 2018, 12:18 am
This has nothing to do with the build but what kind of trees are those off the patio? I’ve never seen them before...
To be honest I don't really know the vegetation here is very diverse with the sub tropical climate and good soil.

I do know that we are now entering the time of year where they will start shedding tons of leaves into the pool :(



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Re: An Africa build

Post by askari » June 14th, 2018, 12:57 am

Another example of the level of ingenuity here, when you don't have clamps and stuff they make their own tools on the fly....
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Re: An Africa build

Post by ajfoxy » June 14th, 2018, 1:30 am

I must say I am very impressed with how well they do with so few tools. :points:


Learning generally boils down to "Repetition or the avoidance of pain", some people learn by doing, some by watching and some just have to pee on the electric fence.

Whether you think that you can, or that you can't, you are usually right. Henry Ford

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Re: An Africa build

Post by askari » June 14th, 2018, 1:12 pm

Houston we have a go!
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Re: An Africa build

Post by askari » June 14th, 2018, 1:13 pm

Houston we have IGNITION!!!....
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Re: An Africa build

Post by askari » June 14th, 2018, 1:19 pm

Secondary ignition is a GO!!!....
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Re: An Africa build

Post by Rodcrafter » June 14th, 2018, 4:20 pm

Nice


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Re: An Africa build

Post by ajfoxy » June 14th, 2018, 5:04 pm

Very nice... can you get a few close ups of the system. I'm trying to figure out how it all works.


Learning generally boils down to "Repetition or the avoidance of pain", some people learn by doing, some by watching and some just have to pee on the electric fence.

Whether you think that you can, or that you can't, you are usually right. Henry Ford

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Re: An Africa build

Post by Big T » June 14th, 2018, 7:36 pm

Heck yeah :beer:


Measure Twice.....Cut Three Times.

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Re: An Africa build

Post by askari » June 15th, 2018, 1:59 am

It's a pretty conventional layout in a lot of ways made up of three boxes:

1. Offset reverse flow cooking chamber
This has a slight adaptation in that the exhaust stack is a row of square pipes that extend inside the cooking chamber to different heights, the cooking chamber also has a cleaning hole underneath the baffle plate that is kept closed when in use using a 2 inch ball valve mounted underneath the box.

2. Connected firebox
This has two air inlets either side below the grate that are controlled with sliders, there is an additional round opening in the door that is directly opposite the bottom of the throat into the cooking chamber this is to assist with the draft and is controllable using a 2 inch gate valve. The grate slides out and has an additional charcoal basket with a minion type separate that is removable.

3. A rotisserie grill sat on top of the firebox and separated by a piece of removable 5mm steel
This has a set of 2 square breather tubes on on top of the other each 5cm square, formed into a "U" shape with each pair of the openings facing an air intake that can be adjusted using 1 and half inch ball valves mounted at either side of the tilting hatch. One of the breather tubes has two openings at the back the other has openings on either side. A 7cm deep charcoal basket sits nicely inside the breather tubes. This box also has it's own adjustable exhaust with a 2 inch ball valve sat on the top between the raised tilt hinges for the front hatch.

The initial burn was hot and fast using sticks of local hardwood and the temperature soared to 320 Celsius (600 farenheit) with all ports wide open. They burnt pretty quick as they had been split into what we would normally use for kindling (its the easiest wood to get here as people use it just to get a pot on the go) and was burnt to ash in a less than two hours. So I didn't get to see about controlling temperature for low and slow.

After about an hour into the burn I could see that there was no perceptable rise in temp in the grill rottisserie indicating that there is propably not that much leakage past the 5mm plate which is just resting on 5mm 60x60 angle iron. I then fired up the charcoal basket with the exhaust and air intake controls for the breather tubes wide open. It chugged along at 200 Celsius and burned for considerably longer that the wood in the firebox.

I have already got the firebox lit again this morning using charcoal and will see how easy it is (or not to) control the temp in the cooking chamber.
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Re: An Africa build

Post by askari » June 15th, 2018, 2:04 am

The breather tubes with last nights ash.
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Re: An Africa build

Post by askari » June 15th, 2018, 2:26 am

This might help.
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Re: An Africa build

Post by ajfoxy » June 15th, 2018, 3:39 am

Thanks for the pics and explanation. Very interesting. :beer:


Learning generally boils down to "Repetition or the avoidance of pain", some people learn by doing, some by watching and some just have to pee on the electric fence.

Whether you think that you can, or that you can't, you are usually right. Henry Ford

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