Now that I’m back from San Diego, I finally get to post about my boat.
This boat features a drive system known as the Voith Schneider propeller (VSP), which is those blades you see sticking out of the bottom of the ship. Wikipedia has a more detailed explanation of how the system works , but in short the system works by rotating the blades in a circle while changing their angle, in effect “scooping” water in a particular direction when the blades are not tangential to the circle they rotate in. The direction of thrust can be changed by moving a control rod that controls the center of tangency (?) of the blades (the blue dot in this diagram.)