Rocket stoves. Need info

[fumanchu1]

What are the dimensions of your intake and exhaust tubes (just radius will do). I'm thinking your intake may be too big or the correlation between the intake and exhaust is off (really hard to tell without actually seeing it in it's functions.


If both exhaust and intake are about the same size, try reducing the intake size and if that doesn't help try enlarging the exhaust (your goal is to create a type of vaccum) think car windows (when you have one opened wide and the other cracked) that should ideally be how the air travels in there. The heat should push itself out the exhaust(top).

[Ashikabi]

Originally Posted by fumanchu1

What are the dimensions of your intake and exhaust tubes (just radius will do). I'm thinking your intake may be too big or the correlation between the intake and exhaust is off (really hard to tell without actually seeing it in it's functions.


If both exhaust and intake are about the same size, try reducing the intake size and if that doesn't help try enlarging the exhaust (your goal is to create a type of vaccum) think car windows (when you have one opened wide and the other cracked) that should ideally be how the air travels in there. The heat should push itself out the exhaust(top).

Intake is 2.5x2.5x4 divided in half for twigs and air. Burn chamber/exhaust is 3.5x3.5x7. These are outside dimensions

[fumanchu1]

Originally Posted by Ashikabi

Intake is 2.5x2.5x4 divided in half for twigs and air. Burn chamber/exhaust is 3.5x3.5x7. These are outside dimensions

can you easily make your twig chamber a bit bigger and the intake a bit smaller? (without much work? if so try that and if that doesn't work try the opposite. Even if it sounds counter productive to try the opposite it would work if your issue is intake size vs exhaust size).


Physics wise, the gasses shouldn't have much issue escaping it's getting them to the chamber that seems to be the issue at this time.

[fumanchu1]

You could always just make yourself or purchase a barrel smoker

[Tcoat]

Need more chimney height and get the twigs up off the base so the air can go around them. The chimney height is not long enough to get the heated air moving at the velocity it needs to draw enough air into the intake. Another 4 or 5 inches should make all the difference. If you want to back pack it you could just make an extension that slips over the top and save some size.


Or...

[Ashikabi]

Originally Posted by Tcoat

Need more chimney height and get the twigs up off the base so the air can go around them. The chimney height is not long enough to get the heated air moving at the velocity it needs to draw enough air into the intake. Another 4 or 5 inches should make all the difference. If you want to back pack it you could just make an extension that slips over the top and save some size.


Or...

Picture not loading. Chimney can't get taller cuz it needs to fit in a paint can. I'll see if I can't find another piece of tube to experiment with a longer chimney to prove or disprove you though. I read it should be 3 times taller than the inlet tube diameter, which it's pretty close to. I only tacked in the twig shelf so it should be able to move

[Tcoat]

Originally Posted by Ashikabi

Picture not loading. Chimney can't get taller cuz it needs to fit in a paint can. I'll see if I can't find another piece of tube to experiment with a longer chimney to price or disprove you though. I read it should be 3 times taller than the inlet tube diameter, which it's pretty close to. I only tacked in the twig shelf so it should be able to move

Pic is a turbo.


The chimney should be three times taller than the diameter of the intake as measure from the top of the intake. Based on your drawing that leaves about 5 inches above the intake. That is about 3 inches short (that's what she said).
You can also install a flapper on the intake to control the draft.

[Ashikabi]

Originally Posted by Tcoat

Pic is a turbo.


The chimney should be three times taller than the diameter of the intake as measure from the top of the intake. Based on your drawing that leaves about 5 inches above the intake. That is about 3 inches short (that's what she said).
You can also install a flapper on the intake to control the draft.

That makes sense, they left that part out. I found another piece of tube so I'm going to cut it down to 4 inches and see what happens

[Tectoniic]

Originally Posted by Tcoat

Or...

Solution to everything right here. Turbo rocket stove hype

[Ashikabi]

Originally Posted by Tectoniic

Solution to everything right here. Turbo rocket stove hype

I actually have a little 120v 3cfm(ish?) Blower motor that looks like a turbo. My buddy got it for his forge then realized it was wildly under powered for what he needed

[humfrz]

I'd make the intake and exhaust the same diameter; just make the exhaust taller than the intake is long.

OR, just lay some shaved pieces of C-4 in the firebox of what you have and light it ......


humfrz

[Ashikabi]

Originally Posted by humfrz

I'd just make the intake and exhaust the same diameter; just make the exhaust taller than the intake.

OR, just lay some shaved pieces of C-4 in the firebox and light it ......


humfrz

I've heard great things about c4. Really hot, no smoke, etc, etc. I'll cut a piece of 2.5x2.5 too and see if that one performs better(I have 2 prototypes, one with 3.5 chimney and one with 2.5)

[Tcoat]

Originally Posted by Ashikabi

I've heard great things about c4. Really hot, no smoke, etc, etc. I'll cut a piece of 2.5x2.5 too and see if that one performs better(I have 2 prototypes, one with 3.5 chimney and one with 2.5)

C4 burns GREAT. Not that I could possibly know from experience or anything though.

[themadscientist]

C4?