Just hemp

[bingo6104]

I haven't had much luck with hemp yet. I am using the 12 strand that BJ linked earlier. I am trying on my fogger for now before I try on my 91%.
I can't get it to wick fast enough..if I put less hemp in it it floods.

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[BJ43]

I haven't had much luck with hemp yet. I am using the 12 strand that BJ linked earlier. I am trying on my fogger for now before I try on my 91%.
I can't get it to wick fast enough..if I put less hemp in it it floods.

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Let it soak up juice for about an hour. it takes hemp a while to swell and really start wicking. When it does it is 4 times faster than cotton. I have four foggers and four Russians with 1.3 to 1.5 ohm vertical R41 coils. I chain vape at 14 to 18 watts and hemp is the only wick that has kept up. The best thing, it is lasting several weeks. BTW, I no longer use wick thru the coil since I discovered the vertical nano on the vacuum systems. IMO the vertical is just so much better than any setup I ever made in many years with wick thru the coil that I doubt I will ever go back. If you do not have hemp fiber to pack around a vertical, you can break down the 12 strand until it is basic fiber.

 

[bingo6104]

Thanks BJ,I'll give it another go soon. I tried the v coil on my 91 . It vape pretty good. But since the coil is small it seem like I was sucking on a old school McDonalds milkeshake. I like more of a airy draw. Especially on sub builds.

I replace my cotton every other day or so.it would be nice not having to do so much.

Btw how so you prepare the hemp when you do the v coil since it is string? Going to cruise back in this thread again.

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[JeremyR]

Word on the vertical build, I've been strictly vertical for months since the dragon thread lead me to come up with an external wrap in my Odessyus clone.

It seems I need more hemp fiber around the coil to act as a juice reserve. Unravel the string as much as possible. And with a 1/16 you should have a fine draw unless you have wick blocking the bottom or top of coil. Keep the bit in the coil while you hemp it .

Dice has a number of vertical Russian build photos in the Vcore thread.

 

[BJ43]

Thanks BJ,I'll give it another go soon. I tried the v coil on my 91 . It vape pretty good. But since the coil is small it seem like I was sucking on a old school McDonalds milkeshake. I like more of a airy draw. Especially on sub builds.

I replace my cotton every other day or so.it would be nice not having to do so much.

Btw how so you prepare the hemp when you do the v coil since it is string? Going to cruise back in this thread again.

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I have gone to larger diameter vertical, 1.8 to 2mm coils. This eliminates the tight draw and clogging after a few days.. I use hemp fiber and pack it tight around the coil and the coil is pressed down tight on the base. The balance of the hemp fiber is packed firm to fill the whole cavity leaving one wrap of coil above the hemp...

 

[bingo6104]

I have gone to larger diameter vertical, 1.8 to 2mm coils. This eliminates the tight draw and clogging after a few days.. I use hemp fiber and pack it tight around the coil and the coil is pressed down tight on the base. The balance of the hemp fiber is packed firm to fill the whole cavity leaving one wrap of coil above the hemp...

Cool thanks for the info. I'll give it a try again. Took a bit to learn the right amount of cotton. Just another learning curve . Since I have that 12 strand hemp I don't have to degum that ? That is just for fluff correct ? Since I do have the twine what do you recommend on how to use it in a v coil?



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[BJ43]

Cool thanks for the info. I'll give it a try again. Took a bit to learn the right amount of cotton. Just another learning curve . Since I have that 12 strand hemp I don't have to degum that ? That is just for fluff correct ? Since I do have the twine what do you recommend on how to use it in a v coil?



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Take the 12 strand and break it down. Break apart the individual strands down to fiber. Wrap this fiber tight around the vertical coil, then pack the cavity with more. No degumming needed.

 

[bingo6104]

Thanks again..I'll give it a go like you mentioned .

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[BJ43]

IMO the vertical coil is only an advantage if you are drawing all your air thru the coil. I see many just sticking a vertical in cotton or hemp in drippers and other rbas with side air holes. Can't really see any advantage over horizontal. My quest for flavor, was always to reduce the air chamber, the smallest air chamber possible is just the coil and !00% of the air going thru it.

 

[dice57]

Agree with BJ43. With rba's that have the air intake below the coil, then a vertical build will give the best performance. On the Flashi that has a side air hole I have the horizontal build with through the coil hemp wick, the flavor and performance is fantastic with this setup and see no advantage of going vertical with it. Possibly a nano Dragon build may see an improvement, will have to see when I feel inclined to rebuild. Right now though, all my rba's are vaping so well that the only thing I need to do is mix up some more juice.

 

[DrMA]

Actually side air intakes work well with hollow coils (wicking material on the outside), provided you direct the air stream to pass thru the coil.

 

[BJ43]

provided you direct the air stream to pass thru the coil.

View attachment 291812View attachment 291813

All the lab tests done several years ago showed that over 90% of the air goes directly up from the inside of the airhole to the mouthpiece. Test were done in a lab with clear caps and colored smoke drawn thru the side airhole. There is a large aerodynamic difference between blowing air thru a small hole into an atmospherically balanced chamber and sucking air into a vacuum chamber where the suction is 90 degrees above the inlet. My point was not that hollow coils don't work, just that vertical has no advantage on a horizontal unless on a below the coil inlet that you can actually flow all the air thru the coil. I use horizontal hollow coils on all my drippers with hemp fiber and they work great, but IMO the only thing that can compare to sub ohm vaper is a vertical at high wattage. I personally consider sub ohm on mechanical just to much of a hassle for all day use.

 

[junquedujour]

hemptraders.com is continuing their 10% off sale and it looks like they have the degummed fiber back in stock. code is: JAN14

 

[DrMA]

All the lab tests done several years ago showed that over 90% of the air goes directly up from the inside of the airhole to the mouthpiece. Test were done in a lab with clear caps and colored smoke drawn thru the side airhole. There is a large aerodynamic difference between blowing air thru a small hole into an atmospherically balanced chamber and sucking air into a vacuum chamber where the suction is 90 degrees above the inlet. My point was not that hollow coils don't work, just that vertical has no advantage on a horizontal unless on a below the coil inlet that you can actually flow all the air thru the coil. I use horizontal hollow coils on all my drippers with hemp fiber and they work great, but IMO the only thing that can compare to sub ohm vaper is a vertical at high wattage. I personally consider sub ohm on mechanical just to much of a hassle for all day use.

You might have missed this, but the cap in that picture has a short tube installed on the inside (it points down in the photo), that delivers air directly to the hole within the hollow coil.

 

[BJ43]

You might have missed this, but the cap in that picture has a short tube installed on the inside (it points down in the photo), that delivers air directly to the hole within the hollow coil.

Yes, extension tubes help, the lab tests used extension tubes, extension cones in various shapes including a fan cone. None really showed much more than 2mm of horizontal air flow.

 

[DrMA]

Is there a link to this study?

 

[BJ43]

Is there a link to this study?

I did not do the test, it was an aerodynamic engineer at a Pratt and Whitney lab. The pics I had got erased when my pic quota filled on ECF a couple years ago and I asked joker to erase my pics to make room for new. This was before I knew about photo bucket. The test were actually done thru a request from a German forum. They started the wave of reduced caps, also the most efficient cap was a cap that was a duel cap, an intake hole then the inner cap with the coil had an outlet hole 180 degrees opposite the intake. The air would come in then travel horizontally being sucked out the back hole into the main cap and up to the mouth piece.

 

[JeremyR]

You might have missed this, but the cap in that picture has a short tube installed on the inside (it points down in the photo), that delivers air directly to the hole within the hollow coil.

I respect your creative birdhouse builds. And I'm sure the tube improved its performance. But it is not the same.

the negative pressure is at the mouth piece not at The other end of coil. The air will flow to negative pressure like a magnet... Now on the other hand If you added positive pressure outside the air hole then it would be more forced into the coil like a water hose.. if aimed Right with enough pressure.

As you see in our builds the air intake enters the chamber directly under or even inside the coil. The negative Pressure is at the top of the coil, ie other side, thus the air is drawn directly through the coil.

Vape on!

(So are you ever gonna try a vertical? Do you have any rbas to try it on)

 

[DrMA]

I have done many verticals, most recently in a Kayfun (hemp wick) and a Fogger (ceramic-hemp hybrid). There are pics of these builds floating around the Modding forum.

As for the airflow theories, I can't speculate. What I can tell you for sure from extensive use is that the RSST birdhouse pictured above with the side air tube works like a charm. One of my favorite setups and faithful travel companion.

 

[JeremyR]

I'm sure it does work great for you. I don't doubt that by the looks of it. I was thinking a 'dragon coil' with an air punch.

We're just saying there is a difference in the air flow dynamics.

So... you notice no difference, whatsoever. between a rsst birdhouse and a true vertical in the kayfun?