Guys, just to clarify, our objective here is to find a formula for the length of chain a given gearing will require on a specific bike. While related, this isn't the same thing as the gear inches of the gearing.

DiegoFrogs, any luck? I'm, like, eagerly awaiting your solution. I was thinking that beyond just helping me with my issue (can I make a two-gear s/s bike that doesn't require rear wheel adjustment upon changing gears), this could also help show the range of gearing one could use on a flip flop hub. All you'd have to do is measure the range of distances your dropouts allow and enter that in along with your preferrred gearing.