An emergency procedure if for some reason the electrical starter doesn't work. If you are gliding around the prop is feathered, that is the pitch angle is set very high to lessen drag. To start the engine you lower the nose to increase speed and change the prop angle to allow the prop to produce thrust. The increased airspeed turns or windmills the prop which the spins the crankshaft to start the engine. The prop pitch angle is manually changed using a level located on the bottom of the instrument panel.

@@tomconte2847 not just an emergency. If you soar long enough you could inadvertently drain the batteries far enough to not be able to use the starter. That means you've had a good flight 🤤

@@TheSoaringChannel Or you might be having a self-launch endorsement or checkride in a Ximango, and this is a required maneuver for those...