Building a DIY Rocket StoveThe Almost Free DIY Rocket Stove Rocket Stoves are pretty neat. Common among campers and backpacking enthusiasts, rocket stoves are relatively new to urban dwellers or those that do not spend a lot of time outdoors. But wait here come the preppers who seek fuel efficient ways to cook outdoors when the grid goes down. Not to make light of the situation, five years ago I had no idea what a rocket stove was nor did I know how they worked. How times have changed. While there are many commercial rocket stoves (and I own two including the Solo Stoveand the EcoZoom Versa)an efficient rocket stove can be had for as little as a couple of bucks if you are willing to do a bit of work. But first, just what exactly is a rocket stove? A rocket stove is an efficient cooking stove using small diameter wood fuel which is burned in a simple high-temperature combustion chamber containing an insulated vertical chimney that ensures complete combustion prior to the flames reaching the cooking surface. Seems simple enough, especially when you consider that rocket stoves are found more commonly in third world countries where wood fuel sources are scarce so an efficient system for converting twigs, branches, pinecones, leaves and other bits of biomass to fuel is essential to cooking. Now as good as I am around the kitchen, in the garden and with the home and domestic arts, building stuff comes not so easy. So I asked Backdoor Survival sponsor Ron Brown who is a retired engineer and really good at this stuff to help me out with some detailed instructions for building a DIY Rocket Stove. He has convinced me that the process is easy and cheap, even for someone like me! Ron told me that many years ago he made some maple syrup. Lacking any guidance, he constructed a boiling-down arrangement consisting of a simple campfire under a kettle. It takes 13 gallons of tree sap to make one gallon of syrup and he made several gallons. It was delicious but he burned a mind-boggling amount of firewood in the process. Not at all efficient and not something you would want to do in a survival situation. Improvised rocket stoves that are common around the world come in lots of designs and various configurations. Their common advantage stems from a principle whereby three sides surround the fire while one side remains open. This facilitates combustion of the fuel and the ultimate creation of heat. Of course, real rocket stoves are double-walled and have insulation between the walls. What we will be describing here uses just a big, institutional-sized tin can with one wall. Buy hey, it works. And besides, 80% of the efficiency improvement over an open campfire (Rons estimate) comes from the basic three-sided feature while only 20% comes from the insulation. The Almost Free DIY Rocket Stove To get started, you are going to need the following: Materials: 1 No. 10 size steel can (institutional size) You can also use a 3-lb. coffee cans or a one-gallon paint can Tools: Utility knife 1. Cut off the cans top and save it. Empty the contents, rinse out the can, then cut a rectangular hole to make a door in the side of the can. The can shown here is 6 in diameter and 7 tall. The door is 5 wide and 4 high. The bottom edge of the door is 1 above the bottom lip of the can. To cut out the door, I support the underside of the metal with a stick of wood clamped in a vise and simply cut the sheet metal with a utility knife (the kind with the replaceable blade). Admittedly, this method takes a fair amount of strength and not everybody will be able to do it this way. Tin snips are not practical for this job. Tin snips have jaws the width of your finger. We want a narrow slit plus four square corners. 2. Put one small hinge in the bottom-center of the door. Fasten it to the can with either small nuts-and-bolts or sheet metal screws. 4. Install a small metal turn button door catch to hold the door closed when its not needed. As shown in the pictures, I fashioned a catch from plumbers strap. 5. Punch a row of holes around the bottom of the can to let in air. Or, cut triangular holes using a church-key style can opener. These holes are down near the bottom lip of the can but are in its sidewalls, not in the cans bottom. Combustion air enters through the holes we punched in step #5, circulates between the marbles, comes up through the holes in the floor, and feeds the fire with oxygen. 8. Oh! Lest I forget. The Dollar Store trivet will come to you painted. That paint will bubble and scorch off in its first use. Scrape away whatever remains. 9. In use, put a flat stone or a layer of firebrick under this stove. Glowing bits of wood will leak out from time to time. 10. Think safety! This is a live, burning fire, nothing to joke around with. Leather gloves, pliers to use as tongs, a fire extinguisher or bucket of water . . . all excellent ideas. When used as a rocket-stove top, turn the trivet upside down if youre cooking with a large pot or griddle. The legs on the trivet, pointing skywards, support the griddle. You cant block off the top of the can (what amounts to a chimney) completely. There must be some space around the bottom of the pot or griddle for smoke to escape. This stove can be used as a small charcoal grill. Despite its crude appearance and obvious limitations, it works well. Once started, it boils water faster than the gas range in the kitchen. By the way, neither Ron nor I have discovered where the rocket part of the name comes from. Maybe it just sounds sexy. Perhaps far more relevant is the question, Whats for dinner? Factory made rocket stoves are great but they will set you back about a hundred dollars on Amazon and elsewhere. These are highly efficient and look pretty. But as Ron says: For my money, seeing as how were burning pine cones, twigs, and scrap lumber . . . and seeing as how this is for emergency use, not day-to-day cooking for life . . . and seeing as how the factory-made model is just as dirty to clean out as this one . . . and will carbon up the bottom of your pots and pans just as quickly . . . Im gonna opt for the improvised/free version. Free is good. Just keep in mind the following disclaimer: Use this rocket stove outside. If you would not start a campfire in the middle of your kitchen countertop then dont use this stove in the middle of your kitchen countertop. Dont lay your bare hand on the trivet-top to see if its hot and ready to cook. Dont pour gasoline on the flames to see what happens. Dont toast firecrackers on the griddle. And do be careful of the raw edges on the sheet-metal door; theyll cut you. This last bit is for real. Read other articles by Gaye Levy here. Enjoy your next adventure through common sense and thoughtful preparation! Gaye Levy, theSurvivalWoman, grew up and attended school in the Greater Seattle area. After spending many years as an executive in the software industry, she started a specialized accounting practice offering contract CFO work to emerging high tech and service industries. She has now abandoned city life and moved to a serenely beautiful rural area on an island in NW Washington State. She lives and teaches the principles of a sustainable, self-reliant and stylish lifestyle through emergency preparation and disaster planning through her website at BackdoorSurvival.com. SurvivalWoman speaks her mind and delivers her message with optimism and grace, regardless of mayhem swirling around us. linkwithin_text=Related Articles: 