Calculator issues

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Chadta
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Calculator issues

Post by Chadta » April 17th, 2018, 6:28 am

Hey guys I am having a big problem with the calculators.

viewtopic.php?t=5479

I have all the pictures and will be doing a full thread on the billed once I get it going right now my time is all spent trying to figure it out.

I have built a smoker basically following the plans laid out by KCD2016 in this thread.

I have 50 to 75° difference in temperature from end to end.

When I use the calculator and imput radius and chord. 9.25 and 14.5 it gives me an area of 35.4

When I use the calculator and input chord and height 14.5 and 3 it gives me an area of 30.

I am so confused , I messed something up and only have A baffle plate opening of 28.

I have two options I can cut back the baffle plate to expand that match my throat size , or I can install my fan and PID controller and just force feed air and not worry about it.



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Big T
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Re: Calculator issues

Post by Big T » April 17th, 2018, 7:06 pm

What size is your cut out for the throat ? The BP gap can be 25% smaller than the throat so it should be within spec at 28 square inches.


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Chadta
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Re: Calculator issues

Post by Chadta » April 17th, 2018, 9:32 pm

That’s the confusing thing, at this point I don’t know what my actual throat area is. Every calculator I’ve used, any of the 2 known numbers get put in and I get a different answer.

Radius = 9.25
Chord length = 14.5
Height = 3

I have double and triple checked those numbers and they are all true.

My 3 possible areas are 29, 30, 35, but the known number that I didn’t use is not matched.



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Big T
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Re: Calculator issues

Post by Big T » April 17th, 2018, 9:52 pm

I'm not sure on that one either but Pete will probably be on here in the early a.m. and he should be able to tell you for sure what you have and what it should be.


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Pete Mazz
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Re: Calculator issues

Post by Pete Mazz » April 18th, 2018, 4:30 am

Using 19.25" diam, 14.125 x 3 will give you a 30" throat. See all the calcs in my sig, including a BP gap calc.


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Re: Calculator issues

Post by Chadta » April 18th, 2018, 5:31 am

Cook Chamber 19.5 X 36 10751.32 in³
Firebox 18 X 14.5 X 15.5 4045.5 in³ 3583.77 in³ 112.88 %
Chimney 3 X 28.63 202 in³ 202.28 in³ 99.86 %
Firebox Air Intake 2 inlets 24 in² 12.14 in² 197.69 % - only have 1
Throat 32.36 in²

That is from this sites pit calculator, so that is what im working with, my throat is 3 inch high, 14.5 wide, so i screwed up in my original throat, and then the baffle plate gap is only 29 as its 2 by 14.5, I can fix the baffle plate gap, but if my throat is way to small im not sure its going to help. Thats why im trying to figure out what my actual throat is.



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Pete Mazz
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Re: Calculator issues

Post by Pete Mazz » April 18th, 2018, 5:54 am

14.625 and 3.3 high is 33" so you're good. 14.5 is 32.4


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Re: Calculator issues

Post by Chadta » April 18th, 2018, 6:46 am

Ok thanks.

Now my baffle plate opening is only 29. I’ve read a few times it can be 75% so I think that’s how I built it. I’ve also read a lot that it should be bigger. It’s an easier fix. Do I need to enlarge that?

Would a shadow plate in the cc on the fb side help even out my temps a bit? I am thinking a 16 x 16/ quarter thick plate spaced out 1 inch from the baffle plate.



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Re: Calculator issues

Post by Rodcrafter » May 20th, 2018, 2:13 pm

Yes


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