We too have survived a couple front flats going down hill. Top speed only 20-22 mph but that is plenty fast for us. Once on a gentle curve that required some steering. Gives a whole new meaning to having a supple tire! My stoker is very good at maintaining a neutral position and that helps a lot.

I have only dumped the stoker once and it was pretty funny. Pulled in after 70 windy miles at a charity ride and we were both really tired. Pulled to a stop on very smooth asphalt and using the "proper method" I put left foot down - it slips and as we tilt left 30 degrees or so I am shocked as I am lifted off the ground in slow motion. I turn on the way up and see my stoker still clipped in at a 30-45 degree angle and leaning way back like a rodeo cowboy. I continue slowly up and she slowly down. She touches softly down changing the weight distribution and I flop straight left on my side. We (along with bystanders) were both laughing before we hit the ground. No skin lost just my perfect record. I now have shoes with some rubber tread for stopping.

I am surprised locking the rear wheel managed to collapse the front wheel. What type of wheel collapsed?

zonatandem wrote:

Descending a hill at 30-some mph (coasting) the chain somehow dropped/bounced from the small rear cog to between rear dropout and cog:
Instant stop! Buckled front wheel.