So it's been a few months for me with my Dauntless flexburn. Ran through about 2 cords of oak and fir mix up to now.
Fir to get it going and oak for sustained heat burns.
Here's my setup...
A mag mount stt
A mag mounted temp gauge on the fleu
6 in sw pipe with rear exit swept into a 45 elbow to a 8in adapter. My chimney pipe is a double walled steel sleeve and is 10ft long.
Starting from cold:
Build a small start up fire with bypass open and front glass cracked. Primary air at 100%.
Add more small splits of fir when i get some small glowing embers. After about 30 minutes close my glass and lock it.
I monitor stt and fleu temps.
Once fleu gets above 300 and if my stt is below 500 I'll fill the box to the brim with fir and close the bypass engaging the cat. That will burn for about 2hours and stt will drop to 300 and fleu will dip to 200.
After two hrs I'll open the bypass and fill the fire box with my oak. I'll have about 6inches of burnt logs and some good coals before the top off with the oak.
Let it sit for about 30 min and then close the bypass re-engaging the cat.
This will get me anywhere from 300-400 degrees stt and fleu never exceeds 250.
I can get about 3-3.5hrs of good warmth all never touching the primary air at 100%. Very reliable and predictable, it only took 2 months to learn.
Change up time,
Yesterday we decided to play with different wood types.
I have a pile of maple alder mix. My previous method doesn't work and Here's what I'm seeing now with this stuff:
Start up with fir like before, when I get to add the maple and some alder... wtf?
The mapple will barely burn until the alder lights then hello problems.
Stt will drop and I'll have to open the bypass at 100% primary and whoosh the fire box will almost explode with flame and stt and fleu temps will rocket. Then I'll close the bypass and the flames die out, the coals will dim and temps drop.
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