I'm attaching a sketch (done with my exceptionally excellent drawing skills) to see if somebody can validate it, improve it, use it, or discard it as a stupid idea.
Basically, this is to help reduce the volume of sticks burning, not to replace them. To use free fuel, if you will.
You create a tunnel on the right (or left) of the traditional burn feed to serve as wood chip hopper and fill it with wood chips in full. There is an airtight cap on top, so no air is allowed in. The cap in the middle has a piston (as engine pistons), that serves to agitate the chips if they stop falling down. The proportion between the tunnel size and wood chips size determines also the amount of attention needed to make this work. Maybe the chips will fall down nicely, maybe not, who knows.
The tunnel is not necessary steel or iron, it can be permanent with refractory, the size also is a variable.
This video gave me the idea to make one from 6"x6"x1/4" square tube. Wood chips are free in my area and with a little care to get them properly dried out "so they don't start to rot", free"ish" fuel?
https://www.youtube.com/watch?v=dtZaOLYuehA My first try was inserting a smaller section of stove pipe into the feed pipe in my pocket rocket and it worked kinda sorta after I got the feed tube height dialed in. What I learned from that first try was that the feed tube needs to be smooth inside and VERTICAL. Also with the chips just falling out of the tube as they burned, the fire would smother itself a bit before it got going again.
My second one was built like the one in the video except the heat riser was was made from the tried and true fire brick wrapped in 1" ceramic wool insulation, even tho I could have made the heat riser out of 1/4" square tube it would still burn out and I would be afraid to insulate it for fear of melting.
The basket is a must, it keeps the opening for air to enter at a constant. In the video it looks like a stainless fryer basket, I made mine from 1/8" stainless round bar.
a hopper with chips- auger fed into the burn chamber controlled by a thermostat- temp drops- auger activates- feeds more fuel- or just calculate the feed rate, and set auger to work at that speed. power for the auger and thermostat etc ? thermo electric generator
Here's a rough video I made a few years back of a prototype wood chip burning rocket stove:
There's an older thread with a little discussion on it here.
Good luck with your stove, I'd love to see some pictures or videos when you get it built!
"Instead of Pay It Forward I prefer Plant It Forward" ~Howard Story / "God has cared for these trees, saved them from drought, disease, avalanches, and a thousand tempests and floods. But he cannot save them from fools." ~John Muir
This thread has derailed. I would like a discussion of my idea, is it viable, I didn't intend to find the most convenient way to burn wood chips in a rocket. There might be, and of course there are.
I had in mind a solid rocket that burns sticks and this "side-chamber" with wood chips, that you can use if you have chips or just keep it shut if not. You know, kind of a module if you will. The rocket has to work as such, and the module can be added or not, if yes used or not. But I would like to know if it is a good idea in itself. I think there are a lot of people that might have access to free wood chips, and really pass the winter with 1/10 of wood quantity advertised for the RMHs.
Location: Queen Charlotte islands, PNW, Canada- zone 6 marine.53.6878° N
sorry mate- didnt mean to detract from your thread. i thought you were looking for solutions to using wood chips- and your drawing was just one proposal- apologies!
on your design though- is the "magazine" going to be loaded only once- or will be continually fed from a hopper( i guess with the air tight seal then it will be a single load.
i am totally new to this whole rocket stove concept- so please forgive my ignorance on the topic- but would it not just be easier to build the fire using a kindling starter- then a wood chip mass fuel-as apposed to conventional firewood. would that not achieve the desired effect- or is the magazine that big that you are trying to achieve a sustained burn.
Location: Northern New York Zone4-5 the OUTER 'RONDACs percip 36''