On a 6" system the chart reads 4-5/16" for base. What are you calling the base? I see everything else labeled or easy to figure out, but that one is confusing me. Is the masonry portion of the riser undersized and then a 6" riser placed on top of that? I have build a couple rocket stoves and see a much more practical application to the batch box design. Thanks for your help.
What is called "the base" is in in fact a base measurement, used to scale all the dimensions of the batch rocket. The base has a fixed relationship to the diameter of the riser. So it isn't the physical base of the firebox or whatever.
The riser need to be the same diameter and shape from top to bottom in order to avoid friction in the flame path which is spiralling up. One side of a square riser is used as the fictional diameter, because of the aerodynamic disadvantages of a square duct as opposed to a round one. An octagon riser is a close approximation to a circle, so those can be the same cross section area.
Speaking of riser height... For a 6" the base # is about 4.3125, math shows about 44" or so from floor of firebox, right? Morticcio's build appears to have a shorter than suggested riser. What's the lower limit on height? Eric VW
Approx. 1000mm (40") - the riser in the batch box is 350mm (14") + the riser extension (as in the bit that sits on top of the cast batch box) is 650mm (26") long.
Not in the house yet - daughter got married just before Christmas so wasn't allowed any distractions! She now wants one in Italy so I can see that being built before this one!
worse places to be than italy. can be cold this time of year though depending on where you are. when i was working over there near bolonia, and we needed the sort of stuff you get in B and Q i was pleasantly suprised how well stocked the local hardware shop was.
Thank you so much for all the work and results posted. I am new and as I start my design of the mass heater in my head, I have a few questions.
1)The P channel on a 150 diam system is 54W x 16H, what is the length of the port overhang? Is there some method to figure this out or trial and error?
2)Is it possible to have a dual exhaust (mass bench on either side), say 75mm left and 75mm right of the stove to meet back up to a 150 exhaust up a chimney? or would I want 150mm both sides to not restrict flow?
This is all very new to me and I can't wait to create a working rocket.
Thank you again and I look forward to the point when I can have a real discussion with all of you.
The firebox internal dimensions are 30cm wide 30cm high and 50cm deep. When a 18cm riser calls for 26 wide 39 high, and 52 deep.
I was wondering if it was Worth narrowing the firebox. Since it's ceilling is lower. CSA of the firebox is 900cm² while the 26x39 makes out for a 1014cm². Pretty close. Air speed in my firebox should be a smidge faster. But when burning fully, i have a bit more wood surface exposed. So more unburned gases.
I know that as a barbie core, exept when fully hot, it was smoking. But my riser is only in the 80cm range, while it needs to be about 130cm.
I can always make another firebox. But for the moment, i'd rather not.
What do you say? It would have door, P channel. I barrel on top. Followed by bells.
mercedes: Not sure where this question will end up...I just registered. HOW THICK SHOULD PERLITE/VERMICULATE/CLAY INSULATION BE BEHIND THE THERMAL BATTERY/COB BENCH IF IT BACKS UP TO A STRAW BALE WALL? Thanks! Can you please also post me: firstname.lastname@example.org thnx!!
May 28, 2018 20:05:23 GMT -8
kkp: Mercedes: Benches don't get real hot. In fact, they are rather cool compared to other areas. You shouldn't need a mix like you described
Jun 7, 2018 18:10:52 GMT -8
maartenmartens: beste Peter, ik heb je eergisteren een mail gestuurd via het contact formulier op je website , heb je die goed ontvangen ? mvg Maarten Martens, architect - geobioloog (mail betreffende de bouw van onze eigen RMH)
Jun 20, 2018 13:21:57 GMT -8
martinm: any one here with info \ experience with heat (from a mass heater) distribution with ducts throughout two storey house ?
Sept 8, 2018 22:58:52 GMT -8
padica: Good morning, this is a wonderful subject, please someone can help me with the theme of double and triple combustion, how it is achieved, theory and design, thank you
Sept 15, 2018 7:13:40 GMT -8
wiscojames: I'm afraid you won't get a response to such a vague question - I suggest reading through some of the threads related to your questions before asking for an explanation. People will be very generous with their knowledge if your question is more specific.
Sept 18, 2018 4:48:00 GMT -8
daniel: in my experience as I am working now on something of that nature, I have thought of making a heat exchanger and distributing the heat through vents using a slower fan. Now after a few years I realize that mass heaters give out primarily radiant heat, for
Nov 30, 2018 12:48:38 GMT -8
coastalrocketeer: Anyone posting in this shout box... if you have something you want people to see and respond to, create a thread in the appropriate forum section... this is not the place...
Dec 16, 2018 18:10:49 GMT -8
vesuvius: High Temperature Glass options,
Jan 4, 2019 16:28:17 GMT -8
vesuvius: Do any of you have experience with using the glass from home oven doors on a rocket stove? I'd like to have a viewing port on my stove but don't want to fork out for new ceramic glass. Any thought as to whether it would take the heat of a rocket stove?
Jan 4, 2019 16:30:40 GMT -8
yaya: you dont need the blowair for that temp..
Jan 13, 2019 16:43:57 GMT -8
flybywire: Glass window from an old washing machine is designed to take high temps. Cheap solution to your need.
Jan 27, 2019 0:10:58 GMT -8
coastalrocketeer: Anyone posting in this shout box... if you have something you want people to see and respond to, create a thread in the appropriate forum section... this is not the place to have a discussion... it is for short announcements
Feb 7, 2019 0:11:23 GMT -8
coastalrocketeer: you won’t likely get replies to questions here, and it is not a spot that makes holding an ongoing discussion possible...
Feb 7, 2019 0:12:22 GMT -8
TexasGonzo: Sooooo glad I found this site! Its always rewarding to find such a super group of folks! To any and all, feel free to PM me anytime. Thanks for having me!
Mar 11, 2019 18:56:41 GMT -8
jlmtech: GADGET: CONSIDER USING A JET PUMP INSTEAD OF A BLOWER FAN TO INDUCE DRAFT; NO CLOGGING.
Mar 26, 2019 8:19:28 GMT -8
michaelegan: i am unable to open the sketchup files on my mac. I used sketchup a few years back but apparently the company now requires a subscription. does anyone have any advice/instructions on how to use the program or how to view pictures without spending money?
Aug 20, 2019 18:41:48 GMT -8
mannytheseacow: michaelegan: download AutoCAD student version for free... import .SKP
Aug 23, 2019 13:33:44 GMT -8