Bloke,
A bit of info as requested.
Hybrid PotWhy a hybrid in the first place….Cos it’s simple, easy to use, fairly fast and avoids the complexity of thumpers reflux balls etc. It’s very frugal on time as each run=a finished bourbon as I single run.
I’ve tried several hybrid designs mainly column height changes some not so successful but have settled on a design I've used for a few years now. A hybrid is nothing flash it's just a pot head with a long coil to improve reflux. I've found over time:
1 Too short a column and the burner will over power the coil and reflux is minimal at best. I call <600mm too short for a 3 ring burner even when run as 2 ring . Settled on 3 ring to get a balance between heating times and run temp control. I now use this puppy now but it’s overkill really, but fast heat time for a 50lt keg.
http://www.beerbelly.com.au/images/mongo23.gif2 Too tall and it will take better than a 3 ring burner to power it(especially if outside in winter) but gas cost too high for my liking...I call >850mm too tall.
I get roughly 4+ single runs from an 8.5kg gas bottle which I reckon is fair.
Coil/ placementTried several coils some like the cold finger type with double helix ¼” with ½ inner produced too much cooling and even at low flows with a pond pump using a waste gate induced too much reflux, produced a nice high abv so low 90’s abv but output was slow as <1.25lt/hr.
Current coil is a simple double helix std coil but its long ~ish at 25cm. The length seems to give you the “control” over abv range when matched to a pot height of about 680mm- 700mm i.e. it adds about 12 -14 abv pts and puts your start in the low 90’s abv (temp corrected btw) and allows you to target an abv you prefer. I target 80abv as it seems a good balance of run speed/output >=2.2lt/hr and flavour from grain based sugar washes generally.
Coil has the inner gap and gap between out coil and 2” column wall wrapped in stretched out SS scrubbers.
Coil is placed just before the 90 degree elbow heads off to a horizontal reducing Lyne arm. So picture one of McStill’s pot heads with a coil brazed in it before the elbow. Simple!
ProcessStarted like we all do making plenty of cuts but its simplified these days based on being generous with cuts. Only two cuts, 1 for foreshots and early heads and that’s a fair bit cos it re used to run an ethanol heater so don’t consider it a loss. I run down to 4.2lt at 80 abv when I’ve generally had enough and fanging for beer. Some would consider it wasteful but realistically I never have to worry about tails, blending, cuts what ever.
Air for a week, spring water down to 65 abv, in goes timber, black pepper corns, vanilla beans if keen. Let it sit for a few weeks in open 5lt jar with coffee filter on top for just.
Close lid, let it sit until out of jars then tip into a 20lt or 50Lt SS keg, reduce timber let it age.
Seasonal changeIn winter I use Saflarger yeasts which work out to about 4+ weeks at house spare room temp. The beer gurus would use a Fridgemate or Tempmate but I’ve never bothered as ambient seems to be spot on for Larger yeasts (also reduces cost of power C/F hot fast brews in winter)
In summer/Spring use specialist or general yeast with aquarium heaters to absolutely manipulate temp so I can choose either a 1week or 2 week ferment.
Done… simple, quick and easy. Cheers
bt1