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The Atom Kerosene Stove  

A full size cooker for the micro-galley

Latest version (June 2008) This latest version has modified swing-in clamps that are even simpler to operate than the earlier sliding pan clamps.

Click photos to enlarge The 2008 version with three swing-in pan clamps secure this kettle in even the roughest sea.

Links:

Atom stove and parts price list (2011)

Atom Kerosene Stove Installation 
and Operating Instructions

Kerosene stove links

My 28-foot sailboat originally came equipped with a two-burner pressurized alcohol stove. Because the fuel was expensive or unavailable in the cruising areas I was bound for, I replaced it with a Primus-type single burner kerosene camping stove and a custom made gimbaled potholder of my own design. This basic kerosene pressure stove has been used successfully for decades by sailors and mountaineers and in the homes of native peoples throughout the less developed regions of the world. It has not commonly been used aboard American boats because there was no manufacturer of a complete gimbaled stove kit of a useable design and because it does require some maintenance and a relatively complicated operating procedure.

Though the propane range has become the standard cooker for big offshore cruising yachts, they are large, expensive, prone to dangerous leaks and explosion, require large sealed lockers for two propane tanks and the tanks can be a hassle to refill in foreign ports with different gas mixtures and bottle fitting sizes. Most people choose to deal with these issues because they want a large multi-burner stove and oven that is simple to operate. Smaller yachts often choose a modern non-pressurized Origo alcohol stove. It's flame is less hot making for longer cooking times and the expensive fuel is hard to locate in large quantities outside the US and Europe. Or small boat sailors can choose one of the little bulkhead mount single burner stoves such as the Force 10 Seacook, which use screw-on propane or butane canisters, but the canisters rust in storage and are not always available overseas and the gimbaled potholders will not hold large pots or frying pans. For local part-time cruising in your home waters these may make sense. But if you are living aboard full time and voyaging to foreign ports, the single burner Atom kerosene stove is a better choice for small cruising boats.  

In recent years I've imported these stoves and spare parts from the Indian factory where most of them are currently produced and I've fabricated about ten stove kits per year including the custom-made gimbaled potholder and mounting bracket. These simple gimbaled cookers have an advantage over other small boat stoves because they handle full size pots including a 10-inch frying pan or pressure cooker and have a moveable counterweight to balance large pan handles. Baking is done either in a thick-bottomed skillet with cover, a pressure cooker, or in a baking pan inside a heavy aluminum pot covered in aluminum foil. 

These stove kits are not cheap because the market is small and fabricating costs are high. Even so, discerning sailors with a traditional self-sufficient and minimalist attitude have asked me to provide them since there is nothing similar on the market. Some of my stoves are for customers I assist fitting out their boats for extended voyages. The only way to make this cost effective is to build several at a time and offer the others to customers online. The reason we import them is because we could not source stoves from a US supplier with solid brass parts and the needed spares to keep them functioning. What good is a marine stove with brass-plated steel parts that rust, no spares and no tech support? The one part that is steel on all these stoves is the pressure pump rod, which if in brass might be too soft for the job. Since it normally rests inside the tank it is easily maintained with a coating of petroleum jelly. 

(Update 2011: Alternatively,  a similar camp stove is available from St Pauls Merchantile for those who want to make their own gimbal system. His stoves have different burner thread size and pump diameter from mine, but he now sells spare burner and pump assemblies. His burner flame ring and preheat cup are plated steel instead of solid brass so if you're concerned about them rusting out I have spares in stock for those two parts.)

Feel free to copy my design and make your own gimbal system (check link at bottom of page) or have a metal fabricating shop make one for you. Although the design is simple and appears easy to fabricate, each stove kit takes about two days to assemble and then the TIG welded stainless steel components are sent out for electro-polishing. The potholder is 3/16-inch stainless round bar and the mounting bracket is 3/16-inch X 1 1/2-inch stainless flat bar. For Atom’s galley layout as pictured below, the stove uses only a single-leg mounting bracket, but a U-shaped mounting bracket is standard for most installations. Contact us for additional information.

ATOM KEROSENE STOVE  

Installation and Operating Instructions  

Installation 

The Atom Kerosene Stove kit comprises the brass stove, stainless steel gimbaled potholder, U-bracket mount, preheat wick, kerosene and alcohol bottles and assorted spares. The stove gimbal assembly bolts to the galley countertop or stove locker using a stainless steel U-bracket. An optional L-bracket and bulkhead mount plate or two slotted flat bulkhead mount plates are available for custom installation. Overall dimensions are 12 3/8-inch to top of U-bracket, 12 3/4-inch side to side at end of gimbal pins and 11 3/8-inch front to back, plus 7-inch swing room for gimbal. Your new stove’s burner is discolored because stove is tested prior to shipping. 

1. Stove location may already be fixed by the layout of your existing galley. If possible, it’s desirable to install the stove near the companionway with burner about 18 inches below a fiberglass, wood or Formica headliner. This is the best area for ventilation. Having heat from the stove run up the cabin headliner and directly out the open hatch will please the cook on hot days. Also, it will be less messy if soot from an occasional flare-up can rise out the hatch. If the stove is not near the companionway, consider installing a hatch or vent above the stove in the coach roof. In any case, vinyl or other fabric headliners above the stove should be avoided as they are difficult to clean and a fire hazard. A sheet of stainless can be attached to the overhead with stand-off clearance, if needed. A drip pan of stainless sheet metal can be installed on the countertop under stove, but Formica is flame resistant enough for brief spills of burning fuel. Orient the stove to gimbal side to side, not fore and aft. Pump slightly left of front center is standard position and should work for most installations. Tank is filled from above or rear with the supplied Kerosene fill bottle or a fuel funnel with a short hose leading to the tank filler.
2. If using U-bracket: Install the U-shaped bracket with 5/16-inch stainless steel bolts thru-bolted to the countertop. If there is some framing or obstruction under the countertop, use heavy lag screws instead of thru-bolts. There will be some spring in the U-bracket sufficient for you to pull the bracket arms outboard until the gimbal pins snap into the holes in the ends of the bracket. Cotter ring clips in the ends of the gimbal pins ensure a secure fit. Certain installations may require the U-bracket mount on the port or starboard cabin trunk side or a fore and aft cabinet face. This will work, but requires a different gimbal lock mechanism and a shorter U-bracket.
3. If using L-bracket: If one end of the stove is against a cabinet or other vertical surface you can use one upright L-bracket bolted to the countertop and one flat plate with a hole in the center for the gimbal pin to insert in, screwed to the vertical cabinet side or aft end of the coach roof. If there is no metal heat shield on the vertical cabinet side then to prevent scorching, a stand-off block of at least 1-inch hardwood should be placed under the flat mounting plate.
4. If using two slotted flat bulkhead mount plates: If the stove is set down into a narrow locker and you prefer not to use the U-bracket, then two drop-in slotted brackets screwed to the vertical cabinets can be used. In that case, you need to build out the width of the cabinet with hardwood blocks, to the correct width for the gimbal pins to insert into the two slotted bulkhead mount plates. A pin or bolt to lock the gimbal should be fit to at least one of the blocks. Don't mount the support brackets so close together that they bind the gimbal action.

Operating Instructions 

1. Open tank cap and fill with kerosene to just below top, using fill bottle. Tank capacity is 950ml (32 oz). You can also use Mineral Spirits from a hardware or paint store or Jet-A fuel from an airport. Never use gasoline or other camp stove fuels.
2. Tighten cap and loosen vent next to cap.
3. Clean burner nozzle tip occasionally with provided wire pick as needed to keep a full flame.
4. Unlock gimbal for use at sea by removing U-bracket lock bolts.
5. Place cooking pot on stove with water in it or whatever you’re cooking so as not to burn an empty pot. At sea, adjust pan clamps to fit small pots by spiraling them inward.
6. Preheat stove by dipping preheat wick in bottle of denatured alcohol and clip wick under burner above preheat bowl. Close bottle top. Light wick with butane lighter. (Lacking a wick, preheat bowl can be filled with alcohol and lit. You can also preheat with high-proof rum. Lacking alcohol, preheat with kerosene, setting stove in cockpit due to smoke.)
7. Once preheat flame has nearly burnt itself out after about 90 seconds, close tank vent by tightening vent knob. Pump the stove two to three pumps. Immediately light burner with a butane lighter. Wick can be left clipped under burner.
8. Pump more for higher flame. Loosen vent briefly for lower flame.
9. Swing lead counterweight outboard to compensate for the weight of a frying pan handle when using with unlocked gimbal. Lead weight locks in position with a wing nut.
10. To shut off stove, loosen tank vent. Do not retighten vent until next use or kerosene will drip out burner nozzle. 

Additional Notes and Troubleshooting: 

To operate a pressure kerosene stove successfully you must follow a simple methodical operating procedure and learn some basic troubleshooting. 

1. When pumping stove, support tank from behind with one hand. At sea when the gimbal is unlocked you may secure smaller pots with the three pan clamps if a heavy sea is running. When cooking ashore or anytime the stove is unsecured, use extreme caution to avoid spilling a hot cooking pot on yourself.
2. For kerosene to burn without smoke or odor, it must be vaporized by a hot burner preheated with denatured alcohol. Once stove is operating, heat from the burner flame itself keeps the burner hot enough to vaporize the kerosene. To ensure proper preheating, place your pot on top of stove before lighting the preheat wick. This prevents drafts from cooling the burner, gets you started cooking with the preheat flame and prevents scorching the boat’s overhead. If the stove emits black smoke the burner was not preheated enough or it was allowed to cool during operation. This can happen by leaving the flame extremely low for a long time or by a wind blowing across the burner. If this happens, release the pressure and allow burner to cool one minute. Begin again by preheating with alcohol. Whenever a sooty flare-up of the flame occurs, release pressure, let cool, clean nozzle with pick and start over by preheating with alcohol.
3. There are three types of kerosene burners. The Atom Stove burner is called a “roarer” because of its relatively loud hissing noise, which is useful because its volume tells you if flame is on high or low without requiring that you visually monitor it. The second type is the “silent” burner, which although having the questionable advantage of less noise, also has a lower tolerance for blowouts by wind. Even the roarer burner cannot take too much direct wind so you may need to set up a temporary windbreak next to the stove at times or partially close a hatch. The third type is a silent burner that has an adjustment knob on the side to regulate the flame instead of using the pump and vent knob for regulation. This burner has more parts to maintain and prone to valve leaks.
4. Although preheating stove can be done by squirting alcohol from a plastic bottle into burner’s preheat bowl, the provided preheat wick is safer. Fill the supplied plastic jar with alcohol and dip the wick into it until fully saturated. Always close jar lid before lighting wick. Keep a hatch open during preheat to reduce alcohol fumes eye-stinging effect. If unable to find denatured alcohol, you can use high-proof rum as a substitute. In rum producing countries it may be the cheapest available alcohol. Another source of alcohol is shellac thinner from a paint or hardware store. Or use a butane torch to preheat burner.
5. If flame is low despite pumping, check filler cap and vent are closed. There may be a leak at one of the three gaskets in the burner assembly. Try gently tightening burner to reseal gaskets and, if needed, disassemble and insert new gaskets above and below preheat cup. Between tank and burner riser tube is a lead washer. If tightening does not stop a leak here, insert a standard fiber washer gasket on top lead washer and retighten.
6. A plugged nozzle (burner jet) requires you release pressure to extinguish flame, use cleaning pick to clean nozzle, then pump stove and relight. If done within 20 seconds the burner will remain hot enough that you can relight without preheating. If you wait longer and allow the burner to cool, you must begin again by preheating with alcohol. To avoid a sooty flare-up, if in doubt, shut down and preheat again. It is essential to use clean filtered fuel and clean the nozzle tip occasionally with cleaning pick. If burner still produces sooty, erratic flame, it may be carbon plugged so replace with new burner and gaskets. Rarely, the one-way pump valve in tank could fail, requiring a new tank.
7. Obviously, another cause of a non-existent flame is an empty tank. Allow stove to cool for two minutes, refill with kerosene and preheat again. Keeping tank at least ¼ full will prevent overheating which decreases the life of the leather pump cup, gaskets and burner. Removing the rubber cap from supplied filler bottle may require pushing rather than pulling from end. Use a screened funnel to refill bottle if there is sediment in fuel. Check fuel level by flashlight, or by cutting a narrow slip of paper and dipping it into tank filler hole and noting fuel level mark on the paper. A full tank provides 4-5 hours cooking time. Mineral spirits can be used if kerosene is unavailable.
8. A dried-out leather pump cup can cause insufficient flame. If you feel little resistance on pump handle, remove pump assembly and apply petroleum jelly to leather pump cup. If this does not improve it, replace with a spare leather cup. Spares come with a wood dowel and bolt to keep the cup spread open. Grip pump shaft with locking pliers, remove nut and leather, unscrew brass cup assembly with pliers and screwdriver and reassemble with new leather cup. You can resurrect the dried-out cup by soaking overnight in a cup of vegetable oil with the wood dowel gently spreading open the end of the softened cup. Take care not to crack the leather. Spare leather cups can be covered in petroleum jelly and stored in a ziplock bag ready to reuse.
9. Always leave tank vent open when not using stove, otherwise temperature changes will cause some kerosene to spill out burner nozzle tip onto preheat wick or bowl. In this event, light preheat wick outside to burn off sooty kerosene. If storing stove out of its gimbaled bracket, empty kerosene from the tank to prevent it leaking out the nozzle tip.
10. To change burners, use a wrench to hold burner riser tube while turning burner counterclockwise using another wrench placed above preheat bowl. Replace fiber gaskets above and below preheat bowl. Carry a spare burner and gaskets.
11. The stove itself is small so having a spare stove is recommended. If something breaks, swap stoves and repair when convenient.
12. The stove can generate temporary cabin heat by placing an upturned clay flowerpot on stovetop. Allow sufficient ventilation for safety and to reduce condensation inside the boat.
13. An oven can be fashioned by placing a thick cast aluminum pot with lid on stovetop with a baking dish inside on a mini cake-cooling rack. To retain more heat, wrap aluminum foil over pot. Cornbread, tortillas, even pizza can be baked in a thick, covered frying pan. Some recipes use a pressure cooker to bake.
14. The stove can be taken ashore or used in the cockpit if you provide a windbreak and a board to set it on.
15. Polish the brass tank with Brasso or rub with a mixture of 1 part salt to 20 parts white vinegar then add flour to make a paste. Olive oil wiped on brass after polishing will retard tarnish.

Click here for sketches and building instructions 
for the Atom Stove gimbaled potholder.

 

Links for more info:

Operating a kerosene stove (Base Camp website)

Cruising Q&A Page (stove recommendations)

Kerosene Fuel Primer All you wanted to know about kerosene.

 

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