For your own safety, keep body parts, loose clothing, or anything for that matter away from the propellers of your radio control planes. Make necessary adjustments to the craft from behind the plane.
Once you have finished your preflight check, there are a few more safety tips to consider. The most important: check the frequencies of other radio control planes or other radio control craft in the area. Most sites designated for the use of radio control craft have a board where frequencies are reported. Check to make sure you arent about to create chaos by launching a craft in a frequency already being used. If there is a pilot with the same frequency, share airtime so that you both can enjoy the day.
Keep spectators at a distance when you are starting your plane. For that matter, keep your plane away from spectators during all times of operation. A low fly by near people may look good in the movies, but it is not very appreciated in the radio control planes world. There are too many opportunities for parts to come loose or the plane to simply reel out of control creating a dangerous situation for someone who just wants to see some good flying. Dont endanger other people.