CCVs really suit Lager brewing and large scale commercial operations, when you want to know about Lager reach for Kunze.
Most of the tanks I have seen have 60 degree cones (1/2 circle), the transition from the cone to the streak (vertical sides) is critical. It really should be knuckle rolled, generally at not less than 50mm radius.
Tanks of any size are usually electro polished internally so the yeast does slide down the cone, remember that yeast slurry is a non-Newtonian fluid, if you want to model how yeast slurry behaves, fill a funnel with custard and watch how it fall out.
If the tank isnt going to be put in a fridge or cold room it is important to have differential cooling between the cone and the streak.
The attachments are a couple of pages from Kunze
Personally I think that unless you are brewing large volumes (over say 500 L) or are exclusively brewing Lager, or just really really love bling, I wouldnt bother, for Ale brewing stainless steel 50 L full enclosed tanks with rounded tops and bottoms work a treat, provided you rack occasionally.
MHB
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Sorry the other pick wont fit, i will try to rescan it in 2 pieces (later)
M