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Post by spmp09 on Jul 7, 2012 3:04:11 GMT -8
Thankyou Peter, Yes lack of stable draw, yet atm, generally lack of draw. 8) (no matter how we improve we still want MORE 8) The pipe protrudes ~500mm outside, with the height just above that of the feed tube inlet. To make mattes worse it exits into a corner which I surmise creates an area of high pressure when the wrong wind is present, with the RMH being the easiest exit 8) (i.e don't us it on a windy day). This is this weeks mission to make a 90deg. bend and raise the exit above the roofline into the winds slipstream.
As for leaving out insulation, what is the critical insulation we are missing?
Thanks for your comment. What is your current state of research? How did things develop after the 'small scale developments' design?
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Post by peterberg on Jul 7, 2012 5:51:41 GMT -8
This is this weeks mission to make a 90deg. bend and raise the exit above the roofline into the winds slipstream. That will be a good thing to do, when all else failed. With strong winds prevailing, don't make the mistake to open a door or window at the off-wind side of the house only. An under-pressure will be created and you will be smoked out. As for leaving out insulation, what is the critical insulation we are missing? As far as the pictures show, there's none around the burn tunnel and the lower end of the feed tube. You raised the stove from the floor by means of a couple of bricks and a metal plate. That's a successful recipe for dissipating heat at the spot where it's most needed. What is your current state of research? How did things develop after the 'small scale developments' design? I'm doing research on a rocket with enlarged, horizontal feed at the moment. The small scale developments, on the other hand, resulted in a deal to license the design. Coming to market this fall hopefully.
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Post by satamax on Jul 7, 2012 12:19:07 GMT -8
Smp, i think to get the hang of the draw, make yourself an all metal, insulated rocket, and see how it sucks air!
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Post by spmp09 on Jul 9, 2012 16:19:50 GMT -8
This is this weeks mission to make a 90deg. bend and raise the exit above the roofline into the winds slipstream. That will be a good thing to do, when all else failed. With strong winds prevailing, don't make the mistake to open a door or window at the off-wind side of the house only. An under-pressure will be created and you will be smoked out. Raised the chimney using tinfoil as a make shift 90deg... proof of concept -- smoke free operation, draws much better, but way too much heat in the exhaust gasses, time to build the 'mass' bit 8) We have plenty of experiences of mushroom clouds in the lounge due to wind pressure changes... As far as the pictures show, there's none around the burn tunnel and the lower end of the feed tube. You raised the stove from the floor by means of a couple of bricks and a metal plate. That's a successful recipe for dissipating heat at the spot where it's most needed. What would you suggest I do to keep the fire off the floor? I suppose filling the gap with polite will not be sufficient. What is your current state of research? How did things develop after the 'small scale developments' design? I'm doing research on a rocket with enlarged, horizontal feed at the moment. The small scale developments, on the other hand, resulted in a deal to license the design. Coming to market this fall hopefully. Wow thats pretty amazing going! Smp, i think to get the hang of the draw, make yourself an all metal, insulated rocket, and see how it sucks air! And lucky me... I have a friend who runs a great big laser cutter and is always looking for exciting projects to do with offcuts in the downtime... We did consider this to be the logical direction to take, I thought of using an RHS called cattle rail here (RHS with rounded sides on the thin side). It will be some time away before I can do this, but any suggestions as to dimension and shape? Looking a the small scale development thread had some interesting shapes, considering the laser cutter can cut any shape what should we do? Ive only got to do the welding and find a metal rubbish tin 8) I can always leave the DXF's in the public domain for the next person to try... I was also thinking about the p-channel, and wondered if there is any need to have a dual one with an exit somewhere in, or at the end of the burn chamber, and of course the other with the exit at the beginning of the burn chamber. cheers
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Post by satamax on Jul 9, 2012 20:07:06 GMT -8
Jasper, i reiterate, your burn tunnel needs to be insulated, not for protection, but for conservation of the heat. On my first metal rocket, you could have it empty after a burn, no ashes or anything, let say ten minutes or even may be twenty, the thick steel was soo hot that you could just put splinters of wood in there and it would light up again without any source of heat or flame. I'm having problems to burn anywhere as clean with refractories (bricks, clay, refractory castable, refractory clay tubing etc) as with steel, but they take the heat far better.
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Post by spmp09 on Jul 13, 2012 3:10:28 GMT -8
Gardammn! Just as I thought it was all going so well! Wind still destroys it! I put a hat on the flue, still no use. The wind was directly towards the side of the roof that the chimney rises 'above', its about 1m higher than the gutter. Do I need more height? Or some kind of hat that creates negative pressure behind it?
TIA
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Post by Rinchen on Jul 13, 2012 3:24:18 GMT -8
Its really best to lead your flue to the highest point of the roof and exit the house there. Inside flues will always do better then outside ones and you have to get higher than the highest point of your house (given there are no other wind obstacles around your area)
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