Bike Anti-Porn - When Things Go Wrong

The Flying Gate was revolutionary.

Not really, and it (along with all the other bent, offset, dimpled and split seat tubes) was a blind alley caused by attacking the problem (rear triangle isn't stiff enough) in exactly the wrong way.

1. The beam is not stiff enough
   2, A shorter beam of the same section and material is stiffer
   
2. Let's shorten the beam
   
   

It was, and still is, a poor solution, because it makes uncomfortable and poor handling bikes. The correct solution is to increase the section of the beam, which yields vast increases in stiffness for small amounts of extra material, keeps the pleasant steering and comfort of a longer wheelbase, and allows a slacker seat tube angle for a given amount of tyre clearance, so you don't have to use set back seat posts.