"Morris Dovey" wrote

Propulsion will be essentially a straight path with a tee connection to
the engine between a pair of check valves. During the expansion half of
the cycle water will be discharged rearward, and during the contraction
half of the cycle water will be sucked in from the forward direction.

I don't need to go fast - I just need to come _back_.

Wasn't it Mr Natural who said that you didn't need to move fast. Just look
cool.

He also said, "Keep on truckin'."