1. The fixed-pitch propeller is used when low weight, simplicity, and low cost are desired and is ideal for neither climb nor cruise.
2. Constant speed propellers:
Decrease the blade's angle of attack as the engine accelerates thus reducing overspeed.
Cause the engine to maintain a set speed by increasing the blade's angle of attack as the engine tries to accelerate.
Allow a fixed throttle setting that causes the engine to accelerate at the same rate as the aircraft.
3. A feathering propeller is a constant-speed unit that can rotate the blades until they are nearly aligned with the relative wind.
4. Constant speed propellers:
Have an independent oil supply that provides lubrication to the blades as they rotate in the hub.
Redirect oil from the engine into the prop, and use oil pressure to change the pitch of the blades.
Have a governor that feathers the propeller.
5. Nicks and scratches on the propeller blade less than 1/8 inch deep are not significant enough to weaken the blade and maintenance can be deferred.
6. The best way to reposition the airplane when it is parked is to:
Drag out the tow bar to move it.
Pull gently on the propeller.
Push gently on the spinner.
7. The root cause of mechanically induced accidents is almost always neglect.
8. A governor failure on either a multi- or single-engine aircraft will cause overspeed.
9. In the unfortunate event of a gear-up landing, at the first sound of the prop hitting the runway, the pilot should:
Add full power immediately and go around.
Add partial power to determine prop damage, and if able, go around.
Not attempt a go-around, but rather ride the belly landing to a stop.
10. Propellers must be overhauled:
At the calendar time limit (typically 5 years).
At the flight time limit (typically 1,500-2,000 flight hours).
At either the calendar or time limit, whichever occurs first.