Controlling ABV on Alembic Type Still (w/ a lentil)

[Kill-Devil]

Observations:

Running a low ABV (5-8%) wash with the refining lentil in place yields starting output ABV 83%
Running a low ABV wash without the refining lentil in place yields starting output ABV 80%

Running a high ABV wash (wash with feints added) with the refining lentil in place yields starting output ABV 90%
Running a high ABV wash without the refining lentil in place yields starting output ABV 85%

The slower the still is run, the higher the ABV% (more reflux, right?)
I understand that the onion shape produces reflux. As does the lentil.

Questions:
Should I be trying to reduce the starting ABV output to around 80% ? After the heads cut, the output still seems way too "neutral" (85% ABV) - though eventually the ABV drops and I get to the sweet+flavorfull hearts.
I'd like to do a series of strip runs and then do a spirit run (as is common practice around here and seems very time efficient), but I'm afraid I going to end up with a bunch of tasteless product. Is the "multiple strips + single spirit run" feasible with this type of still?

http://www.copper-alembic.com/shop/imag ... /72500.jpg

thanks a lot,
KD

[Husker]

Multi strip / spirit runs are possible. However, dump the lentil if you plan on this. If running the lentil (even if just for the spirit run) you are gonna have little flavor left.

Also, on the strip runs, run them FAST, and run until the ethanol is gone.

H.

[Kill-Devil]

Thanks, Husker.

Is it ever worthwhile (or necessary) to insulate the still to reduce reflux even more?

KD

[Husker]

You can on the strip runs. It will heat up faster and have less reflux. The problem it getting decent insulation over that onion head is not all that easy. I have done it before. I also distilled without it last winter, outside, and it was SLOOOOOOWWWWW. I will not do that again. Getting the copper hot enough to let any vapor flow was not easy to do.

H.

[Kill-Devil]

Upgraded to a much larger burner (Bayou Classic) which has helped immensely on the strip run and "ditched" the lentil
Lastest strip run of UJSSM took 2.5 hours. Stripped 40L - starting output (after discarding fores) at 65% and running down to 20% ABV.
Collected about 8 liters. The stripped wash seemed more "depleted" than usual, which I took as a good sign.

-KD

[Hack]

Sounds like you're right in the ball park there.

[plonker]

That really is a nice looking still...

[Kill-Devil]

I'm pretty happy with it. The metal work is first class and I certainly could never have made anything close. It has since lost its shine, but the dull patina has a lot of character imho.

-KD