Christopher D Brown

video link again:
http://youtu.be/U9Pg-Ee8-M0?list=UUH1WWFSPxXjPD7PSKHpYs6Q

Thanks to you both for the feedback.

David are you certain about the ducting needing that treatment. I did not feel it was galvanized just steel like the barrels we use. I feel I'm using the same thing that others use in their designs like in the Ernie & Erica video below:

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Erik: thanks for the formulas - very helpful. I'm not familiar with Donkey's forum, would you share a link?

Since I posted this, I've tried the design from E&E's Builder's Guide: 16"feed, 24"burn chamber (3 bricks, and 48"+ riser (I actually did 50") it burned really well from the start - nice rocket sound! Seems like I'll have to use two barrels if I go with this design, or build up the masonry. Only problem was at one point the fire began to climb pretty close to the rim of the feed side? I'm thinking about reducing it's height to 14". I'd love to hear thoughts?

Thank you all!

Hi Adam looks really good!

I am looking forward to being to this phase hopefully this weekend! Building my first so take that into consideration with my comments...

The first thought that came to mind was your combustion unit looks like my first design...


I've recently purchased Erica & Ernie's DRAFT RMH Builder's Guide (http://www.scubbly.com/item/93600/) and I'm seriously considering changing my design. I just finished a mock up tonight using some of the parameters set forth in that publication: 16" deep feed tube, 24" burn chamber (8 x 6-1/8"), 50" riser! I like it! Burned really well from the start. However after firing for while and upon putting some larger and possibly wet pieces of bark in - it began to smoke on the feed side and flamed up fairly close to the edge. I'm thinking I'll lower the feed tube to 10-12" and see how it performs.




What are the dimensions of the brick your using?

What are the dimensions of your combustion unit; feed tube depth? burn chamber height, width, length and riser height?

Have you figured out your manifold/transition to duct?

Looking good! Enjoy!

Hello I'm building my first RMH. (8", fire brick(2-1/8x4x9") combustion chamber/riser, cob mass).

I am using Ianto's book, Erica & Ernie's RMH Builder's Guide, and two individuals who have built one RMH for themselves (one who has gone to a Ianto seminar) as resources.

We are somewhat stuck on 2 questions(*) and curious about an additional 2:

*1. My current design has the duct system exiting the combustion unit barrel/bell, do you see any problems with this?





*2. My burn chamber measurement is currently approx. 14- 7/8" (7 bricks on edge) (not including fead and riser). Riser is 36", 42" if you measure to floor of burn chamber. It has been suggested to make the burn chamber as short as possible- potentially lessening ash build-up in J of combustion unit. Do you have suggestions/thoughts?




3.Due the limits of my space it seems I will only be able to fit approx 21 feet of duct in my mass. Thoughts?
(Image does not show final leg to exhaust - which would be left on the image...)


4. I plan to use Heat Stop 50 (http://www.heatstoprefractorymortar.com/productDetail.php?HEAT-STOP-II-HEAT-STOP-50-1) use a thin/liquidey mix and dipping bricks (as exampled by Ernie Wisner - "kiln building method" in one of their videos). Any thoughts/suggestions?

Many thanks to all ye permies folks! I am excited to take the next step in my RMH journey!!!

Christopher of NC-USA