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Post by invention1 on Sept 4, 2019 6:38:54 GMT -8
So I'm working on a stove using a walker pre-port. Because of the design of the door, I'm going to allow both primary and secondary air to come in through one opening. I don't have the thing quite finished yet, and want to get the dimensions right. Can somebody @mattwalker please check my math? We faked this up outside with a cast core held together with bailing wire ( LOL) and a 5 minute riser balanced on the back, and the burn achieved clear smoke and a good rams horn pattern very quickly. We're slowly building bigger fires in it to make sure the core is really dried out before bringing it inside. Everything leaks like a sieve, door is made out of a piece of concrete board propped with a brick, but it is good enough for a test burn. No instruments here except eyeballs and a thermocouple thermometer. Riser diameter 8" Riser CSA 50.264 P-Channel 9% of riser CSA for walker pre-port 4.5 sq inches Primary air 20% of riser CSA 10.05 sq inches Opening for both primary and secondary air (This is the part I'm not sure about!) 20% + 9% = 29% = 14.57 square inches <<< Is this right? Am I getting this right, that a combined opening for both primary and secondary air should be 29% riser CSA for a Walker pre-port design?
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Post by matthewwalker on Sept 6, 2019 13:03:00 GMT -8
Should be 9% and 10% for a total of 19%.
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Post by invention1 on Oct 10, 2019 7:11:45 GMT -8
Thanks, Matt, I'm so glad you responded, I was going to build it all wrong again. Pics coming in a separate post.
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