I moved the location to be in a bit more under the metal overhang of the back patio, out of any direct rain. This is a simpler, just as efficient version.
A rocket stove is called such because, drawing oxygen (and fuel) from below, it shoots the flames up the chimney to your frying pan above much like a jet fighter going into afterburn.
Never seen the afterburn of a jet fighter? The following short video is far and away a better re-edit than other versions I’ve seen. Lots of afterburn. Just. Wow. I always continue to be the infant terrible. Reminds me of my fighter-attack-pilot dad:
Whew! Alright then! Back to the rocket stove. Notice that the 8″ stainless steel stovepipe is sitting just so that no flames crawl up the pipe on the outside corners. There’s a strip of tin you can see to the lower-left of the pipe. That strip of tin stretches across the outside corners, over the tunnel, so that no flames sneak outside the pipe:
Below, an inside view, looking down. You see how the pipe sits on the bricks and then over the strip of tin. Nothing is fastened. It’s all just sitting there, with the bricks on the upper outside providing stability:
Of course, I would have to have a rocket stove like this. For those serious about building such a stove (once you collect the necessary, it only takes a couple of minutes), wherever there is hot fire, you’ll need firebrick instead of normal brick.
Some people would make fun of all this, calling rocket stoves a product of conspiracy theories. But, as it is, by experience, right now, our power outages are getting more frequent and longer. Sometimes they’re just 4 hours+-, but what were experiencing more recently, quite regularly, are outages of fully 11 hours. I’ve given up getting milk or cream as it all curdles in a few days even with weeks to come of freshness guaranteed. Other perishables? Forget about it. Gone. The big cities, I think, don’t know too much about super long periods of the grid being down on a regular basis.
I’ve given up on buying, say, hamburger pretty much altogether. I haven’t had hamburger in it seems like forever. It’s also insanely expensive. But if I have some, and I catch it during a power outage in time, I can fry it up. Plugging in the fridge to the solar generator won’t save the perishable. Gotta use them. But there’s still no grid for the stove, so, the rocket stove comes in super handy.
It’s not something you could use during any, you know, three days of darkness, as it’s gotta be outside. But I don’t think anyone who is safely inside is going to be in the least worried about eating any food unless a diabetic. It’ll all be about praying the rosary and begging for the mercy of God. But we should be doing much of that already, right?
Hail Mary…
Oh, and the afterburn of the rocketstove:
Just in case anyone thinks that speaking of such things is infra dignitatem to the priesthood, me being a priest, perhaps we can come up with some charitable use for a rocket stove. The neighbors are all better shots than me, and should they get a squirrel or cat or wild turkey in tough times, perhaps we can all sit around the rocket stove and fry it up together and tell stories and encourage each other in the Lord. Sounds like a plan to me.
ARISE! LET US BE GOING! 
I think the rocket stove a good idea for emergency use should the energy grid fail, which it does sometimes and to be prepared is a sensible precaution. Having said that, I would prefer instead a cast-iron indoor wood stove for cooking that would heat a home and provide its hot water needs as well. There are very fancy models today as shown at the link below.https://glasgowengineering.com.au/uploads/general/Rayburn-Brochure-2020.pdf
But, like my grandmothers, I have used older and simpler versions that worked well and no electricity was required.
Living in an old rented farmhouse when my daughters were young (early 1980s), we had an equally old wood-fired stove for cooking (hot plates on top, firebox and oven side by side beneath) in the kitchen. It was against a wall, on the other side of which was an insulated indoor water tank, its contents heated by the kitchen stove and piped back into the kitchen and also to the bathroom and laundry on demand.
My mother, too, had pleasant memories of her mother on cold winter evenings after the meal and dishes were done, opening the firebox door on her stove and the family relaxing round about in the warmth emanating from it (this was in the 1930s and in an eat-in kitchen of ample dimensions), my grandmother working on her crocheting or doing some work with her hands. I imagine my grandfather read or the family chatted.
When I was a young child (1950s) my parents had a similar arrangement when my father was working for the railway department which was housing some of its rural workers in tents while housing was being built. The tent (actually three put together to form a little home, the middle kitchen/living room tent opening onto two others that served as bedrooms) was surprisingly cosy on winter evenings with its wood stove for cooking and heating, and kerosene lamps for lighting.
Unfortunately a wood cooking and heating system is expensive today and therefore not affordable by everyone; also not usually possible if one is renting since most rentals are all electric or use electricity at least for lighting and plug in appliances and gas or oil for heating etc. I was unable to afford a wood burning system when living in my own home and now that I am in a rented unit such is impossible anyway.
We have a very small back yard (about 7 feet deep and 20 feet wide) where my son and I now reside, mostly concrete, where a rocket stove could be set up for use when the grid goes down for several hours. That does not happen often where we are but a rocket stove would be handy for when it does, yet not for me as I cannot access our back yard because steps are involved. Such would be a useful back-up for most people though.
As for being called a conspiracy theorist if one builds a rocket stove, I can see that being a real possibility even though to have such an appliance for emergency use is perfectly reasonable.
There are genuine conspiracies and theories concerning them are deserving of respectful attention. Nevertheless, as in the case of genuine apparitions, they are oftentimes scoffed at or ignored because false conspiracy theories, like false apparitions, have been planted beside the genuine, like noxious weeds, to confuse the public. And for me to say so earns me the label “nutty conspiracy theorist” but at almost 73 I will likely be pardoned by the politically correct as too old to know any better.