Aircrete Rocket Mass Heater Uses One Log for 13 Hours of Heat 

That's very impressive to heat that whole space all night in single digits temp - with just 3 quarter logs!! Fantastic

That's amazing. I like the rocks in the bench/bed idea. And running the flue pipes thru the rock bed pulls out a lot of heat.

I am glad to see all the improvements and changes you are making around your homestead. It has been a while since you have made any videos about your animals though and I would love to see more about them. I think it was your animal videos that first brought me to your channel.

Thank you, fair lady. The 'morning after' temperature check was a great way to show the real-world effectiveness of this; because 'even though we've heard about its long-lasting heat': demonstrating it like that was of great benefit. Love that you're working with Darwin on helping him to test and refine his design, and honestly documenting the process so we can follow along.

Well done video. I like building/playing with heaters as well as rocket stove hybrids in existing heaters. Its the way to go!.

Very useful to see the rocket stove being taken apart and moved, amazing how light the main box and riser shroud are!

First time seeing your rocket stove. Love it!

Thank you for sharing. I love your family.

2:21 there is no energy inside the ice; Hence "energy does not dissipate OUT of..." ; It is true that breaking up a big ice cube into lots of smaller spieces increases the surface area which helps "to ABSORB energy and melt into water".

I used insulated flue pipe OUTSIDE. Black liquid is history. I also used a T flue at the base of the chimney, with a cap on the bottom, the center pushed out with a hole in the middle. It prevents the liquid from coming indoors. This weeps liquid (outside) when the stove is running cool, just starting, or shutting down. Wonderful build... looking forward to building my next stove.

Hello from Spain Great job thanks 😃

The condensate comes from heated moist air contacting the cool pipe in the bench. Same as when you come into a warm moist house with cold glasses on your face. They fog up. I use the same principal to dry the air coming from my shop air compressor. I run the hot compressed air through a cool condenser to remove moisture.

The 22 dislikes were the power companies.

All burning creates CO2, H2O and energy. As long as the smoke is over 100C or 212F the condensation does not happen. It happens in the cool chimney, so let the moisture drip outside by making a small hole for water to drip outside. Make the horizontal part of the chimney slightly crooked outwards to keep the liquid out.

the thermal conductivity and specific heat capacity of all common materials has been well known for a long time.... looks these up and spend an hour learning how to use then cab sane a lot of money and time on trial and error. Some amount of trial and error will always be useful though. FOr instance the voids in between the pebbles could be filled with sand or concrete fines , if filling the entire thing as a solid concrete or concrete fines could be superior to sand...... If one wanted to have a quick release from the thermal mass one might retain the voids and blow air through it for a time. Nice video!

Good stuff. FYI Ice absorbs energy to melt. If ice were to further dissipate energy, it would become colder.

Wow, awesome!

yes julie your condensing steam. insulate the outside riser or shorten it . or if you want to stay on the ground, replace the lower outside 90 with a "t" with a bottom cap and a 5/16 hole drilled in the cap ( so the condensed water doesnt go back inside and leak from the vertical joint; it drips thru the hole in the cap outside) now as you duct outside air to your stove you get to keep all the heat you make. 30% more efficient. ( no heated air used to support combustion. cold outside air supports burn) be well and be warm!

I had a really hard time hearing this video, my sound was all the way up. Thank you though for taking your time do do this.

You have blessed my life! Thank you for sharing with me. 🤗

LOVE 💖 LOVE 💖 LOVE 💖 your new stove. We've been interested in a RMH for years, but had to do a cheater version (which I videoed) since we have a hardwood floor over a crawl space. Your adventures with Darwin's stoves led us to his HoneyDo Carpenter channel and my hubby is so hooked on his designs. We're definitely interested in how this new model works out. 💥 Oh, and your water dripping issue - check the level on your exterior stove pipe. I had a similar issue on a wood stove in my home in Georgia. When we anchored the riser, it got pulled in towards the house too much and caused the horizontal to kick up outside. Smoke rises, but water flows down so you have opposing actions in that area. A small hole in the horizontal pipe (outside) will act as a weep hole so the drippage can go onto the ground (a dug out gravel area or a bucket helps). Thanks for sharing another wonderful time with us. Love and Prayers from Utah.

Just subscribed. TY love what your doing in fact I'm trying to do the same thing, I mean RMH, animals and greenhouses. Are their plans for specifics for this RMH build?

i always wondered what became of you after little house on the prairie ended

Too cool:)

When the chimney water settles / evaporates, is the residue more like creosote or ash? And is it only while the bench is warming, or the whole time the fire's running through the bench? A question for Darwin, has he thought of making a 3 stage valve instead of the 2 stage? If there was one, it could be connected to the upper where the pipe comes out of the bench near the wall instead of the lower going into the bench. You could then set it to send heat up the chimney (open to the bench but not going through) , or going through the bench, or closing the chimney to ward off cold air coming down into bench or stove when not burning.

Love the hat

Very nice . :))

Please replace the battery in your smoke detector!

So have yall gave up on a homestead in OK? That is a neat little stove.

I had that black oil problem with one of my batch box stoves. I used a barrel with 3pipes opened to radiate heat. But I got gallons of black oil. I believe that the glavinzed pipes mixed with hot gases causing the creation of oil. Don't get that effect in brick tower, same firebox

Very strange 😳! And very neat 😃👍👍🇺🇸🇺🇸🇺🇸!

I was trying to figure out which smoke and carbon monoxide alarm was chirping in my house. Couldn’t find it. Then you mentioned that it was yours. Lol.

Wow - I never thought about paper clogging up the chimney duct. I have a baffle on my stove - so I don't think paper has been sucked up.

Great stuff, thanks for sharing! I feel compelled to point out that if someone had been sleeping in there over night, it would have been even warmer when you checked the temperature in the morning than it was. How much warmer is a great question, but warmer nonetheless.

Years ago had wood stove in bus did same thing

Hi, neat stuff. So how many Sq ft is that cabin? And how cold was it outside average over this time period? I just find it hard to believe that 3/4 of a log can give out enough BTU to heat that space for that long of time unless it's super insulated. It's a mass flow. Btu added minus loss. 3/4 of a log doesn't have very many BTU's. ???

I've just missed most of your video trying to find my smoke alarm that needs a new battery. 😤

In case of accidental fire, reach through the flames to access the fire extinguisher, Good Planning

If your outside pipe is insulated you should not have that black water dripping problem. But if your outside pipe is insulated and too big the chimney temp will be too cool due to cold air exchanging with the hot air down your outside chimney pipe. If your outside pipe is too big just reduce the size of the exit opening at the top of your chimney , that will stop cold the exchange of the air traveling down your outside chimney pipe and problem solved . Try it . I really like the stove build and great demo video .

So now you’re back in your big house and renting the cabin?

no, pls don't shorten your chimney,that is the true engine of all stoves; insulate it and clean it looks to me like you have a creosote buildup from cold fires, make sure you are giving the stove sufficient air for it to free burn, as choking it off combustion creates creosote due to cool combustion temperatures, this is probably the result of improper use by your tenant as u described

I'd like to see Darwin do some comparative experiments using Zeolite sand for thermal absorption. Adding water to it should help with heat transfer due to its properties & can add humidity to the air. Studies done by the Germans show that Zeolite has superior thermal heat retention & transfer properties.

Great show...and I would love to see your smiling face a bit more Julie....I see Darwin every saturday....lolol

Water is the best simple and cheap way to store heat and move heat around. Have you ever experiment with water and rocket stove?

Julie, thank you for sharing and creating this content while Darwin is working to complete his content. I am sure it helps keep the excitement up around his work while he grinds through the less fun portions of the Portable Mass Heater Rocket Stove Documentation (LOL, I don't know that I have that name right!) at HoneyDoCarpenter. We already knew you were a great person, and an entertaining instructional RU-vidr with a wonderful family, but you are also being a awesome friend. Thank you for sharing this content. The scientist in me loves that you guys thought to place the Portable Stove into Tiny Home into the same bench the prior one was it. It'll be a great Control for the experiment. I also like the idea of trying out the pebbles/stones over the sand. I am a little unclear though what the advantage of one over the other is going to be. It'll be fun to hear your observations! My guess is that the result will be more airflow will work it's way through the pebbles than the sand with might make for faster convection of radiant heat from the sides of the Shroud. I am not sure though which filler has a greater balancing affect on heating your space from the Shroud portion itself. I am guessing there will be a lower mass to density ratio which would create a higher propagation of near term heating. Saying it another way, I think you'll feel warmer sooner. =) Let us know if that happens. ;) Thanks again, my family enjoys your channel and we too live in Idaho but in the SW.

Water is from condensation you can insulate the chimney outside

How much of a "good" seal is the sand? It must leak somewhat as the sand will leak air.. ;)

Can you heat a house with this?

all country people have to say i'm going to go ahead and.. do this... instead of i'm going to do this....

Example ..... sand on the beach is hot,you can not stand on. The Sun clouds over and the sand is cool in a matter of minutes.

1000th like. 💓

where is that "water" coming from?

Ahhhh, I want one of these sooo bad!!! But I don't think I can make it. Maybe I can find someone I could pay to build it from the plans

Maybe coal would avoid the condensate issue?

😯👍👍👍👌

Any build plans please.

Yea, must be transatlantic thing, I prefer to set a fire, go to sleep and know I can easily start it up in the morning using the coals

Does this guy make and sell these? Seems to me it would be a great business with light weight freight, so not expensive to ship. I want one of these, exactly the same size you have. . I already have a foamcreat machine. Paid a fortune for it 2 years ago. It's still in the box. Called a Little Dragon.

With my 31 years on a paid fire dept we went to many of these hippy fires. Listen to that woman coughing..

I miss Darwin! I miss Mrs. honeydew! I hope they are OK!

Aircrete doesn't seem like a very efficient thermal battery due to the lack of density and insulative quality of the air.

Great video. That is not gasification just fyi.

Maybe more like, the bench horizontal: vertical chimney ratio is poor. The more horizontal feet of pipe, the more vertical pipe there needs to be, to draw harder, to keep the air moving thru the bench, is what I’ve seen. If you shorten the vertical pipe, it might cause the airflow thru the bench to stall, or even reverse. But, you know how windows get condensate? Ours used to do that, especially when outside temps started changing, in spring, & again in summer. But, when we insulated the old single-pane aluminum windows, by installing a matching recycled window as a storm window, with 3” airspace between them, no more condensate. That dripping goo looks like a condensate, from temp difference not been enough to either burn that residue, or, carry it up and out. And, the goo is maybe, denser than water, so lingers. Had you tried insulating all that single wall pipe, to see if it solves the goo collecting & dripping there?

ESTO ya a sido probado y no funciona para calentar una casa. Si la caja de fuego no es grande no calentara lo suficiente la estufa. Si no usas ladrillo refractario con ladrillo comunes no podrás mantener el calor lo suficiente para que sea agradable y no mueran de frió los habitantes de la casa y recuerda que debes ir al bosque cortar esa leña, apilarla y debe estar seca para el invierno. Gastos de combustible para la sierra ,camioneta,tiempo libre, distancia del bosque, mas el gas de la soldador igual a gas propano o piso radiante evolución. Suerte

Hello.... Your co warner dont make an alarm... It says the batteries are low... You have to replace new batteries and then you have silence... I would go crazy with that... An alarm would be sound like.... Whowhowhowhowho. . Not bic....... Bic....bic.... This is the control sound for low battery

Wtf is that thing she was sitting on with the wheel spinning?

Please just replace the battery in that smoke detector. I couldn't finish watching the video

Please put a battery in your smoke detector.

That water thing is weird

Did Darwin's heater, heat your home before removal? what are you heating your home with now ?

Nice video but you really need to invest in a mic can't hear what you're saying most of the time

Oh, the cinematography needs to improve. The shacking, back and forth. I am about to vomit !

IT WOULD HELP IF YOU KNEW HOW TO EXPLAIN THINGS..............

Where did the black water come from that was in the bowls?

The 22 dislikes were the power companies.