Here, shipyard workers are using a cutting torch while
replacing fairings on the starboard shaft. You can also see the starboard
propeller or screw, covered in plastic sheathing to protect it. The CROMWELL
has two, three bladed, controllable pitch propellers, 5.5 feet in diameter.
Controllable pitch propellers always turn at the same speed and in the same
direction. We control our speed and whether we are going ahead or astern by
changing the angle that the blades meet the water (this angle is called the
'pitch').