I did this on the Missouri a couple of years ago. Worked Great. Made a steady 2.5 MPH into a brutal headwind that had the canoers pulling over. I just sat with my feet up holding a PBR in one hand and my hat in the other and shouted HEADWINDS A BITCH at all the grumpy people on shore.The most common method for river sailing is a bucket system. Typically, one ties a chain of buckets to a bow line and drop them into the river current.