In THIS post in the Action Gallery I used my Pigeon Ignus to brew up my breakfast cuppa and in that post ... I got to thinking that it should be a simple job to make a roarer flame plate to give an option to convert the burner from silent to roarer whenever it took my fancy. Not a simple job! The only pattern that worked turned out to be more complex than I imagined! The silent burner (equipped with retaining wires to prevent it falling off and getting lost in transit) is actually a converter cap for a burner that’s of the usual ‘target’ flame plate pattern. Thinking that, I cut a flame plate out of brass sheet and dished it slightly with a ball pein hammer. It looked ok in place, but in use it created underburn (quite an achievement on something other than a silent burner!) with a flame front hovering around the jet and disrupting flames emitted above the flame plate. Probably reducing the ‘target’ disc size would have improved matters, but I was in a creative frame of mind (!) and formed a cone out of brass sheet, silbrazed to the underside of the flame plate, and silbrazed a brass rim in place on the flame plate spokes. The ring to the right is a packing shim to prevent the flame plate component from dropping off the burner in transit - the equivalent of the brass wires holding the silent burner converter cap on. Installing it on the burner ... Fuelled up, ready to try it out. Ignition! Action of the cone is to deflect the flame to where it’s wanted. John
@presscall Hej John, Very interesting what you have build! Some time ago I was thinking about a similar design to make roarers silent. Assuming the cone inhibits the impact of the stream onto the flame plate, which leads to the roaring turbulences. My project never came over theory, so I'm very courius about the loudness of your burner... I'm always fascinated of your ideas and how you turn them into reality! Ciao, Bastian
It’s unmistakeably a ‘roarer’ still Bastian! There’s some ‘target’ that the gas stream hits head on (the ‘spokes’ of the flame plate) but less than is usual for a ‘target’ roarer burner. The surplus kinetic energy in the gas that doesn’t impact on the spokes accounts for the longer flame spikes than is usual for a simple ‘target’ roarer burner. The energy dissipates as heat (of course) and about as much noise as before. John
Great job there John, When this lockdown is over I want to sort out equipment for brazing/silver soldering. I have a propane torch but need to look at MAPP? At the moment it just thought. Alan
Yes, MAPP Alan. Well, that’s what it’s commonly known as but with your background in the chemical industry you’ll know the gas is MethylAcetylene-Propadiene Propane, so ironically it contains propane but with stuff that gives it a bit more zap! The special blowtorch for it exploits that, but I find that installing a propane (blue) gas cylinder on my Rothenberger torch makes it work fine as a propane torch - yellow MAPP cylinder screwed on and the extra heat for silbrazing is on tap. “When this lockdown is over” has a good ring to it! John
@presscall Are you still using the flux coated brazing rods from B&Q or did you ever find a suitable, cheaper alternative? I’ve totally run out of silver solder/brazing rod so it’s time I got some more in.
@presscall Ok, thank you! Currently I'm brazing (small things) with a propane torch. For a further ptoject I'm also looking for a MAPP torch. Some of you are using one from Rothenberger, but which one? Can you recommend one? Ciao, Bastian
@Sternenlicht I use a Rothenberger ‘Superfire’ which is robustly built, has a piezo sparker that ignites the gas every time and there’s good spares availability. I’ve not needed spares but I did buy a finer flame nozzle, which came with its own (smaller jet orifice) jet and a hexagon key to faciliate the jet change. As well as the MAPP gas the torch is designed for ... ... it works well with propane too, producing not so hot a flame of course. Not a Rothenberger accessory (though I suppose the company markets one), I find a clip-on broader base is convenient. One other useful accessory - as large a kerosene (or gasoline) blowtorch as you can find. If silbrazing a pin-hole in a stove burner, for example, the kerosene torch gets the mass of brass up to red heat and the MAPP torch can be used to super-heat the spot to be silbrazed to get the silbraze molten and flow. The amount of metal in a larger component like that acts like a heat sink and leeches away the heat from the MAPP torch alone, making it slow going and heavy on gas to get the silbraze spot hot enough. John
Presscall ,please can you have a look at my new tread re 155 optimus with a cracked nut, I know you have posted a lot on the 155 ,I`m a sailor and not much experience on repairing stoves but can turn my hand and follow most things .Sorry I`ve jumped in on this thread but didn`t know how else to contact
You just needed to do an ‘Alert’ with the @ symbol in front of my username. So, @presscall No matter, I see your enquiry.
