Dennis,,

You are probably referring to the Veco "21 Series" stunt tanks. The cutaway picture they showed in their T-21 advertisement from 1960 has a longitudinal baffle that ran from end to end. The baffle has a single row of holes along the vertical centerline. I can't tell if the baffle was flat (probably) or had a vee in it to help feed the outboard chamber. The venting shown was almost certainly conventional, not uniflow, with both tubes exiting the upper surface in the forward inboard corner. For the grand sum of $1.10 you could own one yourself back then. No boxtops required.

I have taken apart a few old tanks to see if they were worth fixing up and using again. None had this baffle. (An old tank that was well-used--maybe even abused for never having cleaned it--are generally is going to be usable since it was coated with castor and protected. A brand new tank? Probably not....)

I have not put a baffle in any of the tanks I have built. Haven't seen the need so far, but maybe I should try one on a setup that never seems to run right?

If I was going to build a baffled uniflow, I'd put the uniflow right out to the outboard edge just like usual. If you don't, you're starting to flirt with chicken-hopper features but without chicken-hopper operation. More work and no advantages that I can see.

Dave

I completed the Ringmaster tall tank. The tank is 1 3/8" wide, 1 3/4" tall and 2 1/4"long with uniflow and a GMA style pinched corner and baffle. Uniflow line is located outside the corner baffle. The tanks holds approximately 2 3/4 oz. which should be more than enough for the OTS pattern with the VECO 19BB. I am having trouble loading pictures so I may need more than one post to get them loaded.

Best,   DennisT