Iain
The still in the plans is a CM (Cooling Management) still which is controlled by adjusting the flow of cooling water to the coil so that a proportion of the vapour is allowed past the coil.
LM (Liquid Management) stills condense all the vapour and allow you to remove an adjustable amount of condensate.
VM (Vapour Management) stills work by allowing part of the rising vapour to be diverted to the condenser before it reaches the coil.
It is generally acknowledged that LM & VM stills work better than the CM variety, which one to build is down to cost, skills, material availability. LM versions are better at compressing the fore shots and heads whilst the VM are better at compressing the tails. LM stills are cheaper to build and require a needle valve, VM stills are more straightforward to build and require a gate valve.
Here is a great read for LM stills
http://wiki.homedistiller.org/index.php ... w_To_BuildAnother for VM stills
viewtopic.php?f=15&t=787It is possible to combine the two types of still and build a LM/VM Combo that gives you the best of both worlds. Many people start off with one type and then add the other facility at a later date.
Here is a link to a thread combining the two systems.
viewtopic.php?f=15&t=1437Iain you may have read the links before but I posted them for the benefit of other readers as well.