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Hello Friends,

To drill a Reverse calabash, we drill two chambers, a chamber of combustion and a chamber of condensation. But how to drill for the best the hole of smoke between the two chambers ? I saw R.C. drilled under the chamber of combustion. What is the best ?

Thanks and all the best for all !

Lag

You can drill secondary chambers wherever you want, depending on the design of the pipe. The hard part is making sure it looks good in the overall composition.

I cannot speak with any authority in regards to where the second chamber should or should not be located in relation to the bowl. Every RC I've made has the chamber in the shank. The hole diameter between the two chambers (regardless of how far apart they may be) is the same as it is for everything I make: .156 or 4mm and it all works well.

sandahlpipe wrote:You can drill secondary chambers wherever you want, depending on the design of the pipe.

Not so according to Anthony Harris. The "connector" airway has to be some minimum (or maximum? I can't recall which) length for the design to work right. There's also a minimum chamber size.

Maybe he mentions design constraints/dimensions here: (If not there are some purty pictures )

http://acmepipes.com/Double-Chamber.php

A small drawing to illustrate my question:

http://s1375.photobucket.com/user/Lag2/ ... ent&page=1

LatakiaLover wrote:

sandahlpipe wrote:You can drill secondary chambers wherever you want, depending on the design of the pipe.

Not so according to Anthony Harris. The "connector" airway has to be some minimum (or maximum? I can't recall which) length for the design to work right. There's also a minimum chamber size.

Maybe he mentions design constraints/dimensions here: (If not there are some purty pictures )

http://acmepipes.com/Double-Chamber.php

Sorry George but references inre Anthony Harris are not allowed as he is not of this planet. Humans only.

I didn't see the specifics on the connector airway or chamber dimensions on Anthony Harris's website. My best-smoking reverse calabash is currently a little chubby apple where the second chamber is directly under the chamber with maybe 1/4" airway between. I have others with varying sizes of chamber in varying positions. I've seen Chris Asteriou make a second chamber in the shank where the stem appears to fit on sideways. And of course Revyagin puts second chambers any variety of places. Sure, to do a proper job of cooling the smoke, it's got to be large enough to allow smoke to cool, but I don't know that the position really makes that big a difference.

Thanks for your opinions.

The question isn't so much the placement of the chamber as the functionality of the chamber itself. The second chamber MUST BE the proper size to cool the smoke or the only thing you have done is made a pipe with a ridiculously over-sized mortise a-la a system pipe. Much the same as with a Gourd Calabash there must be a certain number of square inches (and no, I don't know what it is...but, Anthony does because he actually did the math) for the cooling to take place.

I'm not saying that a smaller second chamber is a waste of time...sometimes they look cool and I'm sure the pipe smokes wonderfully.

LAG- your picture looks good to me. Make one and see how it goes.

Generally speaking, the larger the chamber, the cooler the smoke. I don't think anyone makes larger chambers than Anthony Harris.

If you're interested in some measurements, there's some science behind it here: http://tobaccodays.com/articles/100-pro ... ler-smoke/

Thanks, Scottie and Jeremiah. Very interesting paper about R.C. and temepratures of smoking.

I made 2 RC but I was not sure I drilled the secondary chamber correctly. Now I think that is about right.

http://s1375.photobucket.com/user/Lag2/ ... sort=3&o=9

http://s1375.photobucket.com/user/Lag2/ ... sort=3&o=8

What do you think about that

sandahlpipe wrote:Generally speaking, the larger the chamber, the cooler the smoke. I don't think anyone makes larger chambers than Anthony Harris.

If you're interested in some measurements, there's some science behind it here: http://tobaccodays.com/articles/100-pro ... ler-smoke/

There is no generally speaking. Unless the chamber is at least a specific size there is NO ADVANTAGE to the secondary chamber. Again, I don't know and don't need to know the math/science as Anthony has figured it all out and I have spoken with him on more than one occasion regarding the double chambered pipes. And until I decide to make one I have better things to worry about.

Anthony actually doesn't make his chamber too big, but exactly the right size to maximize the cooling of the smoke. Anything smaller than what he makes his there isn't enough volume to effectively cool the smoke (again, backed by his numbers). And anything larger than that the smoke is damned near stale by the time it makes it through the stem. Again, this is a math/science thing that he has taken the time to figure out. Anyone who is truly interested in the math/science behind it and not just supposition should seriously consider giving him a call.

AND AND AND AND......what I find so fucking funny about this article is that the pipe pictured has a HUGE secondary chamber. It might not be one of Anthony's pipes, but it's damned close to the size of the secondary chambers in his. And the numbers don't lie....his pipe was by far the coolest of the three RCs used.

I made a RC whose secondary chamber is equal to the combustion chamber. It works well. I also did a CR which the secondary chamber is equal to 50% of the combustion chamber. It works well too and shape is more balanced.

Lag.