I will be aging 15 gallons of Flanders Red in an Oak Barrel using the Wyeast Roselare Blend (don't recall the number).
Another side question...
Say after a year I only bottle 10 gallons and leave 5 gallons in there, will I be able to brew 10 gallons of Flanders and top up the barrel and let age for a year without any ill effects? I was wondering if the barrel needs to be emptied and cleaned out after a long aging period or can it perpetually be used year after year as I just described?
Thanks for everyone's replies!!
One thing to note is that the empty part of a barrel will tend to dry out over time and may leak when you add beer to it later. It depends a lot on the barrel, the environment (humidity) and how long it is half empty. Of course it will seal itself up fairly quickly when you add the beer, but you don't want to see good beer leaking out until it does.