Originally Posted by
Joda
Huh? An airplane is not a boat. You don't steer it with the rudder. You bank the airplane to redirect the lift vector so it will turn. You use the rudder to keep the airplane coordinated (i.e., the ball in the center, not slipping or skidding). The rudder is not turning the airplane. The wings are. Read the FAA's "Airplane Flying Handbook" (FAA-H-8083-3B), starting on page 3-10. The section titled "level turns" will give you the whole scoop. One quote from the handbook that is germane to this discussion:
"The pilot uses the rudder to offset any adverse yaw developed by wing’s differential lift and the engine/propeller. The rudder does not turn the airplane. The rudder is used to maintain coordinated flight."
Note that it specifically states that the rudder does not turn the airplane.
Getting back to spins, others have already stated that you can enter a spin from either a slip or a skid. If the airplane is coordinated during the stall, it won't spin. If it's uncoordinated, it may spin. Keep the ball in the center and all is well!