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Ceramic liner

 
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I have a source for some free ceramic flu liners 7 X 7 inch, and want to know if this will work or not for the heat riser. I have not seen anyone using these, and was wondering why? they seem like another option to a 1/4" steal pipe.

thanks for the a reply in advance
 
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I too am wondering the same thing. Also could they be used for the tunnel and feed tube?
 
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it will work for the heat riser but not for the burn tunnel. the burn tunnel needs a bit of roughness to mix properly. this is a primary reason the all steel welded jobbies dont work so well.
 
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I am not the ex-spert here but 7 x 7 I beleive would work on a smaller sized rocket! On the few I have played with my burn tunnel works best just under a 2/3rds ration. Meaning I would "try" my burn tunnel around 3.5" high around 4" wide? with that sized flue. it's a little smaller than standards that I have seen. you will have to insilate around the out side if you use ceramic in my under standing. Make it with what you got I always say!
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