I had an unfortunate but lucky experience with a wooden propeller on an RC airplane. I accidentally hit the channel reversing switch on the transmitter while I was working over the plane. The propellor spooled up really quick and it my arm going really fast. Lucky for me, all I got was a 1.5 inch gash instead of a missing finger.
Moral of the story, think ahead like 4 steps in whatever you are doing. A lot of accidents will be prevented. I don't think you need a guard because it would be impractical but just be careful in what you do.
Have fun. 
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Teacher/Engineer/Machinist - Team 696 Circuit Breakers, 2011 - Present
Mentor/Engineer/Machinist, Team 968 RAWC, 2007-2010
Technical Mentor, Team 696 Circuit Breakers, 2005-2007
Student Mechanical Leader and Driver, Team 696 Circuit Breakers, 2002-2004
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