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I've been down with flu, and ready to get back to build.

Here is what I'm considering. A 6" system, with 12" feed tube, 18" burn chamber with a 42" Riser. The riser is offset 2" from burn chamber and my thinking is it can help improve efficiency. This also causes the chamber to 6 x 4.5" causing acceleration (I hope).

Help my diminished mental capacity to achieve goal, or are you thinking oh crap, this guy is going to burn down shop.

Scott
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RMH Burn Design
 
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Peter van den Berg and other researchers have tried an offset riser and similar configurations, and found it didn't give any advantage. I would advise building your first J-tube by the book; then when you experiment later, you will have a basis for comparison. You can't know if something is better if you haven't seen the thing you're comparing it to.

 
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