"Sure thing!" Frank replied.  "I've been thinking it all out.  We'll do it this way: When we get ready we'll put on full speed ahead on the motors, with the prow turned against that obstruction below. Then we'll hop into the Wolf and shut everything down tight.  The Black Bear will weaken the jam below, and the sharp nose of the Wolf will poke through the rest of the logs and canoes.  And there you are!"