The following article is taken from the AMA National Newsletter.
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This article is from the Alabaster Radio Control Association.

PROP SAFETY

Install the prop with the curved side of the blade facing forward and tighten the prop nut or bolt with the proper size wrench.

Check the tightness of the nut or bolt often, especially on wood props which tend to compress and loosen more often.

When starting the engine, keep spectators at least 20 feet away from the model and out of the path of the propeller.

Keep hands away from the prop as much as possible. Use a chicken stick or an electric starter.

Keep face and body out of prop arc as engine is started and run.

Make all adjustments from behind the prop except on pusher prop installations.

Never throw anything into the prop to stop the engine. Use a kill switch or pinch off the engine's fuel supply.

Discard any prop with nicks, scratches, splits, cracks, or any other sign of damage. Never attempt to repair, alter, or bend a prop.

Don't run an engine in areas of loose gravel or sand. The prop can throw such material into your face and eyes. It's not a bad idea to wear eye protection.

Keep loose clothing, shirt sleeves, and other such items away from the prop and avoid carrying objects that can fall into the prop such as pens or screwdrivers.

Be sure to keep the glow driver wire out of the prop path.

If a spinner is used, be certain that its edges are not in contact with the propeller blades.

from Alabaster Radio Control Association
http://rcclubs.com/arca/