So, here's one for the, " Why didn't I think of that?" files....

Volvo's new inboard drives use counter rotating props placed In Front of the drive pillar, so they operate in hydrodynamically "clean" water, giving better performance, acceleration, handling and fuel economy.

Also available is a Joystick control, which allows easy docking and low speed maneuvering, simply twist and move the stick the direction you want to go, the props do the rest.

Some neat innovation.

Volvo North America