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A woodgas stove, different idea for mixing secondary air

Posted: Tue Jun 30, 2009 6:02 am
by therealtrevor_nz
Hi all, I've just uploaded a woodgas stove video, have a look: http://www.youtube.com/watch?v=EDb1s14SshU

It uses three cans and a computer fan. Would appreciate your thoughts!

Cheers,
Tim

Re: A woodgas stove, different idea for mixing secondary air

Posted: Tue Jun 30, 2009 8:59 am
by irrationalsolutions
it looks good. now see how it boils and let us know! :D

Re: A woodgas stove, different idea for mixing secondary air

Posted: Tue Jun 30, 2009 9:19 am
by zelph
Where does the secondary air come in?

Your fan is going to melt.

with the fan on you'll be constantly feeding wood into it. It's going to burn way too hot.

Re: A woodgas stove, different idea for mixing secondary air

Posted: Wed Jul 01, 2009 10:49 pm
by texron
Great idea but as Zelph said I think the fan will overheat. Nice thinking outside the box

Re: A woodgas stove, different idea for mixing secondary air

Posted: Fri Aug 07, 2009 6:02 pm
by zelph
I think they melted :o

Re: A woodgas stove, different idea for mixing secondary air

Posted: Sat Aug 08, 2009 9:37 am
by oops56
zelph wrote:I think they melted :o
When ever i find what i need for my wood stove i build it tell then on hold i got the just right fan for it

Re: A woodgas stove, different idea for mixing secondary air

Posted: Sat Aug 08, 2009 12:47 pm
by zelph
oops56 wrote:
zelph wrote:I think they melted :o
When ever i find what i need for my wood stove i build it tell then on hold i got the just right fan for it
Stainless steel I hope, no melt :D

Re: A woodgas stove, different idea for mixing secondary air

Posted: Sun Aug 09, 2009 4:43 am
by therealtrevor_nz
The secondary air goes in the bottom with the primary air but it goes up the outside of the inside can which holds the wood. It mixes with the woodgas at the top of the inside can.

The fan didn't melt with this concept. It melted when I tested something else but that was because the meths I used to start the fire dripped onto it, rather than from the heat of the wood burning. As it is pulling in cool air and blowing it toward the fire, there is no reason why it would melt.

I think I'll experiment further with and internal chimney idea I tried which was quite successful and didn't use a fan (Although I have three more fans now so I might crank them out again at some stage...)

Re: A woodgas stove, different idea for mixing secondary air

Posted: Sun Aug 09, 2009 11:03 am
by realityguy
Why not mount the fan to one side with a 90 degree bend ..or trap setup..so that can't happen?..like a vent pipe elbow..I think if your batteries died you'd have a similar problem with ashes and sparks falling onto the fan unit.

Re: A woodgas stove, different idea for mixing secondary air

Posted: Sun Aug 09, 2009 9:34 pm
by zelph
After viewing your video several more times I have a question.

How much wood does it hold ?

What does your potstand look like, does it attach to the stove?



Are you still testing it, firing it up to see how it holds up. The outside of the stove should be well discolored by now, Have any recent photos of it?

Something to consider; if alcohol is used to start the fire, why not just use an alcohol stove?

The introduction of secondary air might be useful in large industrial furnaces but I don't think it's beneficial to a small quart size backpacking stove. The double wall design is very nice on paper but in actal field use for backpacing I don't see a need for it. Single wall stoves work equally well and weigh less.