6” Batch Rocket with Double-Skin Bell - As-Built Details & Materials

This post provides the materials detail of my build that can be viewed here - https://permies.com/t/40/238503/Batch-Rocket-Build#2296204. The door is currently under construction and the final build will be posted once completed.

Target ISA for 6” system per Peter van den Berg = 57 sq ft
Actual internal dimensions = 42.5” x 22.5” x 65.5”
Actual ISA = 57.6 sq ft
Double skin brick bell
Riser height = 36” (8.3 x base)

External bell dimensions = 58.5” x 37.75” x 71”

Clay brick (solid) 8” x 3.75” x 2.25”
Refractory brick (Jet brand – 2,600 deg rated) 9” x 4.5” x 2.5”
Insulated refractory brick (Minteq brand) 9” x 4.5” x 2.5”

Clay brick total including exhaust port = 900
Ref brick total not including core = 120
Sakrete construction sand = 10 ½ – 70 lb bags
Lincoln 60 fireclay = 3 ½ – 50 lb bags
Total calculated weight of bell = 7,200 lbs

Combustion Core
Ref brick = 44
Ref brick splits = 20
IFB = 20
Ref plate for roof 12” x 24” x 2” – 2

Additional Materials
1.5” x 3/16” angle iron for core stand and roof supports – approximately 40’
3/16” sq solid steel for lintels over core, exhaust port and clean-out - approximately 22'
Superwool 24” wide x 1” thick (almost 1 full box)
Superwool gasket – used in all places where steel meets brick
Lynn Mfg Waterglass – adhesive for Superwool gasket
Sairset refractory mortar – thinly applied on refractory brick joints to fill gaps
½” threaded rod attached to core stand door supports

Excellent build and documentation newly graduated Rocket Scientist!
This material list and your build thread are invaluable for folks considering their first build!
As Master Builder Peter always says, "Follow a proven plan and get proven results"

Looking forward to your second, third, and fourth build!
Your diploma, lab coat, and pocket protector will be arriving in the mail as soon as we have such things!
Until then you may proudly use the title of Journeyman Rocket Scientist and wear your Dragon Technology staff shirt!

It is truly an honor to wear my Dragon Technology staff shirt as I lounge and enjoy the warmth of the newly fledged dragon. I'm anxiously awaiting the lab coat and pocket protector addition to the DT swag.

Hey Glenn, what did you use to "seal" the top of the firebrick ceiling?
Or another way of phrasing the question: what is between your firebricks and clay bricks in the ceiling?
I see where you had spread something on top of your firebricks in the development thread.

Hi Matt... it is Superwool blanket. I was pretty deliberate to cut both the refractory brick and clay brick so they fit snug with no gaps since there is no mortar used for the roof. The Superwool does a really good job at sealing between the two layers. For the first few months of running the furnace I kept a CO detector sitting on the top just to see if there as any leakage and never had the detector trigger.