I got an email back from the creator of http://www.brickbending.com/. He said the maximum bending angle for 1x2 bricks is between 6 and 7.5 degrees.
I'll have to dig through my Lego in storage to see what I can come up with.
Jeff Wrote:If you don want to push the limits of the bricks, you can safely get a 6 degree angle between two bricks in a bend (i.e. a 60 brick circle doesn't put too much stress on the bricks). I tend push the limits in my designs, so when a circle is called for I'll typically use 48 bricks (7.5 degree angles).
I'll have to dig through my Lego in storage to see what I can come up with.