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tiny rocket mass heater hat

 
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Mud and I came up with this idea a little over a year ago and we are starting to implement it here at wheaton labs.  

Here is an early attempt at the amazing dogstar (photo thanks to stephen):



This is a cottage rocket.  Reports are that you go to bed at 75 and wake up at 55.  That's too cold.  We need to add a mass.

Here are some changes that mud and i are requesting:


opening:
    wider (at least 15 inches wide)
    lower (maybe no more than 5.5 inches from the barrel)
          - this will make the overall thickness of the mass a bit thicker

inside:  want two bits of angle iron riding above the top of the barrel

overall cob mass:
   overall height is perfect
   shape of the top is perfect
   would like the mass to be 3 inches thicker all around
   would like the mass to ride down the side of the barrel 3 inches
   (optional) have the mass cover the back of the barrel
       - a sorta poor man's heat shield plus more mass



 
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That is a nice bit of cob!
Low and wide sounds a lot like the opening to a pizza oven is that what you're aiming at?
It looks a little like some of Matt's earliest work where he was cooking directly over the top of the barrel.
 
paul wheaton
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pizza ...   cookies .... pie ...


Mostly, wanna not touch the middle of the barrel - that could lead to spalling.  And instead of sending radiant heat to the ceiling, let's heat a mass and keep the heat a little lower.
 
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I REALLY like the idea of the cob hat, tho I would want an opening big enough so I could still use the top of the bell/barrel to cook or heat water. So a hole large enough to insert a small to medium sauce pot. Does that seem, physics-wise, possible?
 
paul wheaton
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Yes, that is a possible path.  

I am looking into making the opening shorter and wider - to better facilitate pizza.
 
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