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Angle of feed tube - L - Shaped, J - Shaped or V - Shaped

 
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Hi everyone

Very excited to be beginning my first rocket stove which I'm going to use to replace my BBQ in the back garden

One of the remaining decisions I have is the feed tube. I gather that an L-Shaped feed / burn tube allows for my more control which is preferable when cooking i.e. you can move the sticks in and out to regulated the heat. However, my preference would be a gravity fed system. So I'm considering the pros and cons of a J-shaped profile, or perhaps what you could call a V-shaped profile where the feed tube is at say a 45 degree angle.

So far I can't really see why you would use the angled feed. It takes up more space, and friction in the pipe may prevent the sticks sliding down as easily as a vertical tube in the case of the J profile. However, the sticks should be much closer to the vertical insulated chimney flue. Maybe there's a benefit there? Maybe less smoke back?

Any thoughts about the J and V profiles welcome thanks
J-vs-V-tube.jpg
[Thumbnail for J-vs-V-tube.jpg]
 
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Location: +52° 1' 47.40", +4° 22' 57.80"
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woodworking rocket stoves wood heat
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In my experience, the combustion is getting worse when fuel is getting in the tunnel, same goes for an angled feed. In case of the latter there isn't actually a tunnel so no horizontal flame path either. Flames will go up the riser just like that, maybe very long flames but also a dirty burn. The horizontal flame in a j-tube is doing most of the mixing which is really the reason why it burns so clean.
Stick to what is known to work, don't re-invent the wheel.

Just my opinion, of course.
 
Jambo Reece
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That's good enough for me
 
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