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Post by yoda27 on Aug 31, 2011 15:18:47 GMT -8
As a "Newbie" I really did used the "Search", but couldn't find any answers.
1. Are there any ratios between the length of the "air/fuel" intake tube, and the length of the riser?
2. Are there any ratios between the intake tube diameter, and the riser tube diameter?
3. Should the "Fire Box" area have a "soft bend" like a "J" or a "hard turn" like a "L"?
I did find, that the air/fuel should be divided "1/3 air[bottom], spacer, 2/3 fuel[top], but that is about all I've found...
Thanks for any help,
Yoda
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Post by Donkey on Sept 1, 2011 7:48:10 GMT -8
As a "Newbie" I really did used the "Search", but couldn't find any answers. 1. Are there any ratios between the length of the "air/fuel" intake tube, and the length of the riser? Typically "as short as possible" is the answer.. I assume you're building an Aprovecho style rocket cooker.. You want to be able to feed in the wood without trouble and get it to set there without falling out. Convenience is your main consideration here. They've been keeping it all the same. Same tubing/cross section throughout. Hard like an L is the general rule, though I've made 'em rounded like a J and had no trouble at all. That's right. the 2/3 up top is for feeding in wood, the 1/3 at bottom lets in air, pre-heats it and guides it directly under the fuel. No prob.. Welcome to the board.  |
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Post by yoda27 on Sept 1, 2011 11:42:22 GMT -8
Donkey,
Actually, I was thinking more on the lines of a "Grover". 6" long Air/Fuel Intake Tube, sharp L (90 deg.) bend, and then 18" long Riser/Flue Tube to the top. I would make a "Fuel Support Plate" for the Intake. First a 50/50% plate and then a second plate for 70/30%, (fuel to air ratio). Where the intake tube passes thru the side of "can" I would make brackets and pop rivet into place. Pack the can with perlite, and place a loose fitting top ( loose around the flue but oversize for the can). If everything works out, I will weld or pop rivet the top to the can, and drop a collar in between the flue and top.
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hpmer
Full Member
Posts: 240
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Post by hpmer on Sept 1, 2011 15:20:57 GMT -8
2. I've had good results with a 4" horizontal tube feeding a 6" heat riser.
3. I like mine with a "T" connection as it provides an area for coals to build up, and also provides for more turbulence in the transition area.
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Post by yoda27 on Sept 2, 2011 12:05:31 GMT -8
Thanks guys,
Good stuff, and interesting too...
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