I was JRA (Just Riding Along). I swear. When, as I approach a very slight climbing corner, I stood up and upon exiting heard a "pop" and "th,th,th" that I initially thought was a puncture.
Stopped. Examined both tires and both appeared firm. Spun both wheels and no sound. Remounted the bike and started to pedal away, "th,th,th".
Repeated the above examinations and got on the bike again. This time I looked down for the noise and saw that the rear, drive side, dropout had cracked and was allowing the tire to rub the chainstay near the bottom bracket.
I knew Mrs. Fred was out for a run. Her parents were visiting, but, I knew that trying to give them directions to my location would result in two lost seniors and me still on the side of the road. So, I elected to attempt to ride home. Up hill was actually easier than down. As long as I kept steady pressure on the pedals throughout the entire revolution, chain tenstion would keep the crack closed up. But, down hill I had to grab as much front brake as my hand was capable of in order to pedal softly against that resistance and keep things tight. Fearing that the other side might let go at any moment I didn't dare go any faster than I was willing to crash:-)
I initially planned to only go as far as the nearest coffee shop and then call for help with an address and business name the olds could find. But, by the time I reached the first one I was so close to home that I simply carried on.
Now, for the reparations.
In the meantime it's back to the old Caad4 and 180mm cranks for me. Riding the shorter cranks for the last few rides has certainly convinced me that the longer, proportional cranks are the way to go for me. I would be curious to ride some 190s in addition to the 200s on Bierwagen. But, the 200s are certainly superior to the 180s for me.
Check out the framebuilders forum if you want to follow the repair efforts.