FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   RegisterRegister 
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 


New 500 gallon RF trailer build in progress
Goto page Previous  1, 2
 
Post new topic   Reply to topic    The Smoke Ring Forum Index -> Cookers
View previous topic :: View next topic  
Author Message
EightySecond



Joined: 19 Sep 2013
Posts: 17

PostPosted: Fri Oct 11 13 8:35 pm    Post subject: Reply with quote

Thanks a lot MongoNC, that's great. My tank is a 41" diameter by 104" I believe.

Also, does the 30.83(.5)" Half moon FB to CC opening translate to the measurement from the top center of the 1/2 moon to the bottom center of the arc below?

I think the 1/2 moon calcs have to be the most confusing part in my head so far. Embarassed I should have paid more attention in math class apparently.



MongoNC wrote:
82nd,

I just did a quick run of numbers on your setup and came up with a horizontal center line on your tank as around 50 inches based on a ground clearance of 12" and the info in your link.

12" + 36" - 30.83(.5) - 1 + 37(.5) = 50.085

12" Ground clearance
36" Height of FB
30.83(.5)" Half moon FB to CC opening
1" Grease bridge
37"(.5) Horizontal center line on 37 diameter 500 gal tank

None of this calculates the thickness of metal each component is made from and assumes your 500g tank is ASME sized.
Back to top
View user's profile Send private message
k.a.m.
BBQ Mega Star


Joined: 12 Dec 2007
Posts: 26014
Location: Southeast Texas.

PostPosted: Fri Oct 11 13 9:08 pm    Post subject: Reply with quote

Another measurement to calculate is grate height from the ground. You may have to modify your firebox dimensions to achieve a workable cooking height.
I will try to work up something tonight.
What is your desired grate height?
What is the distance from the ground to the trailer deck?
_________________
Always remember slow and steady wins the race.

Hybrid Cooker
Back to top
View user's profile Send private message
EightySecond



Joined: 19 Sep 2013
Posts: 17

PostPosted: Fri Oct 11 13 10:56 pm    Post subject: Reply with quote

I sure would appreciate that kam. My deck measured at 20.5" and the ideal height of my lowest cooking grate would be as low as 40" and as high as 48", I am 6'5" and could get away with the high end if I had to. Turns out my length is actually 103" on the tank.


Here is the label plate.

SoEzzy, I think I resized it correctly, I will fix it if not.





k.a.m. wrote:
Another measurement to calculate is grate height from the ground. You may have to modify your firebox dimensions to achieve a workable cooking height.
I will try to work up something tonight.
What is your desired grate height?
What is the distance from the ground to the trailer deck?
Back to top
View user's profile Send private message
Wreckless
BBQ Super Pro


Joined: 15 May 2009
Posts: 2292
Location: New Braunfels, TX

PostPosted: Fri Oct 11 13 11:46 pm    Post subject: Reply with quote

I had a similar problem with a 30" build on a trailer rig. I ended up with a min of 11" fb ground clearance and 37" grate height. I achieved it by not going with a true / full radius on my inlet. I took the top inlet cut almost to the edge of the cooker and gradually added mat'l along the radius to maintain somewhat of a grease retaining wall down into my grease bridge and still had a proper fb inlet opening and a decent distance from my plate to first cooking grate. The calculation was made using A-B tangent points and opening height using the below link. Hope this help getting it all to mesh.
http://www.1728.org/circsect.htm
Back to top
View user's profile Send private message
EightySecond



Joined: 19 Sep 2013
Posts: 17

PostPosted: Sat Oct 12 13 7:40 am    Post subject: Reply with quote

Thanks for sharing that, I will take a look.

Wreckless wrote:
I had a similar problem with a 30" build on a trailer rig. I ended up with a min of 11" fb ground clearance and 37" grate height. I achieved it by not going with a true / full radius on my inlet. I took the top inlet cut almost to the edge of the cooker and gradually added mat'l along the radius to maintain somewhat of a grease retaining wall down into my grease bridge and still had a proper fb inlet opening and a decent distance from my plate to first cooking grate. The calculation was made using A-B tangent points and opening height using the below link. Hope this help getting it all to mesh.
http://www.1728.org/circsect.htm
Back to top
View user's profile Send private message
k.a.m.
BBQ Mega Star


Joined: 12 Dec 2007
Posts: 26014
Location: Southeast Texas.

PostPosted: Sat Oct 12 13 11:09 am    Post subject: Reply with quote

EightySecond, based on a 41" tank and a 48" grate height along with a 20" deck height I came up with this.
1/3 volume of a 41" x 103" tank is 45305.75 Cu.in.
A firebox 32.5" high x 39" wide x 36" long will give you 45630.00 Cu. in. slightly larger than you need.
Your firebox to cooking chamber opening should be about 365.4 Sq. in. A half moon of 30.5" wide x 15.25" tall will be 365.31 Sq. in. No bridge will be required because of the cooking chamber size. Center line on your tank is around 20.5" if your firebox to cooking chamber opening is at the top of the firebox and you drop the firebox 4" down from grate height you still have about a 1.25 bridge.You can get more bridge by manipulating the opening as Mike mentioned
Now with a 20" deck height you should see about 11.5" firebox clearance.
Bare in mind your trailer will sink from the weight causing a closer distance, measurements I just gave are on paper not real life scenario.
You can also decrease the distance between the R/F plate from 4" to as close as 1" for more clearance.
I hope this helps. Very Happy
_________________
Always remember slow and steady wins the race.

Hybrid Cooker
Back to top
View user's profile Send private message
EightySecond



Joined: 19 Sep 2013
Posts: 17

PostPosted: Mon Oct 14 13 10:36 pm    Post subject: Reply with quote

That's great kam, I sure do appreciate that! I feel good about making some cuts now.

k.a.m. wrote:
EightySecond, based on a 41" tank and a 48" grate height along with a 20" deck height I came up with this.
1/3 volume of a 41" x 103" tank is 45305.75 Cu.in.
A firebox 32.5" high x 39" wide x 36" long will give you 45630.00 Cu. in. slightly larger than you need.
Your firebox to cooking chamber opening should be about 365.4 Sq. in. A half moon of 30.5" wide x 15.25" tall will be 365.31 Sq. in. No bridge will be required because of the cooking chamber size. Center line on your tank is around 20.5" if your firebox to cooking chamber opening is at the top of the firebox and you drop the firebox 4" down from grate height you still have about a 1.25 bridge.You can get more bridge by manipulating the opening as Mike mentioned
Now with a 20" deck height you should see about 11.5" firebox clearance.
Bare in mind your trailer will sink from the weight causing a closer distance, measurements I just gave are on paper not real life scenario.
You can also decrease the distance between the R/F plate from 4" to as close as 1" for more clearance.
I hope this helps. Very Happy
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic    The Smoke Ring Forum Index -> Cookers All times are GMT + 8 Hours
Goto page Previous  1, 2
Page 2 of 2

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum


Powered by phpBB © 2001, 2002 phpBB Group