Filo
New Member
Posts: 8
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Post by Filo on Jan 22, 2022 0:26:00 GMT -8
Hello,
1. Peter many times wrote that 20% shorter firebox isn't problem. What with width of firebox ? the same rules ? Can I reduce depth of fireplace about 20% and also make fireplace 20% wider ?
Of course sizes of rising channel will be as nominal. I assume that upper box in this case will be in size like reduced firebox depth + riser depth and width like extended firebox width, ok ?
2. The connection between rising box (splits) and around skin bricks should be dry or with mortal ? Any thin insulation between them as slide surface can be use or it is not necessary at all ?
Best, Filo.
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Post by peterberg on Jan 22, 2022 2:19:02 GMT -8
1. Peter many times wrote that 20% shorter firebox isn't problem. No, I did not. What I wrote was: lengthening the firebox by 25% didn't pose a problem in the development stage. Nothing about shortening what so ever. See my post of just 3 days ago: donkey32.proboards.com/post/37236/threadThe DSR2 design is as strict as the normal batchrocket. This is what has been tested very extensively, the modifications you are talking about are not. You are planning to do it in a different way? Fine with me, go ahead, but please don't say/write "Peter said it can be done". The feeling that I get from your post: a shorter design would suit you better. That said, a layout similar to the sidewinder configuration would stand a good chance though. The port in one of the side walls, centered in the short riser and the top box at right angles with the firebox. This is a non-tested configuration but it is along the lines of an already proven layout. |
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Filo
New Member
Posts: 8
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Post by Filo on Jan 22, 2022 2:39:55 GMT -8
I'm sorry that I wrote many times - that is true but only for lengthening as You wrote. I remembered: "DSR2 exhaust
Dec 8, 2019 at 2:49pm QuotelikePost OptionsPost by peterberg on Dec 8, 2019 at 2:49pm
Can't read the .skp file, it's in a newer version of SketchUp than what I am using.
To answer your question directly: no, you can't place a chimney elbow on the exhaust of the DSR2, simply because it's too hot in that spot. The exhaust need to be on top, not to the side. Changing the overall design will result in a system that doesn't work, almost quaranteed. Stick to the specifications that is known to work, it will save you from doing a lot of work with results that are highly questionable. All that said, what is known as allowing some slack is the total depth of the firebox. Make that 20% shorter as a maximum and keep it to the same proportions. That might or might not be enough, but I expect it would do just as well. By the way, a 200 mm system is a really big cannon, you need a large space to utilise that. You could also opt for a 180 mm system I'd say. My development model is just 125 mm and already surprisingly powerful. Even more so than a straight batchrocket." from topic: donkey32.proboards.com/thread/3612/dsr2-exhaust Mine English is poor so maybe I didn't understand correct it. Best, Filo. |
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serg247
Junior Member
The mountain can not be conquered, it can allow it to ascend...
Posts: 111 
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Post by serg247 on Jan 22, 2022 2:59:45 GMT -8
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Post by peterberg on Jan 22, 2022 3:15:29 GMT -8
Filo, you are right, but... I wrote the above in the context of a 200 mm system. Which doesn't mean it is true for every size of firebox. A shorter 200 mm straight batchrocket system has been built years ago and performed as expected, yes. I know about a 200 mm DSR2 sidewinder in existence, is that what you want to build?
This DSR2 is not entirely built to specifications and coupled to a 200 mm piped bench which poses too much friction to the gas stream, in my opinion. But at the end it did work, as I understand it.
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