Well, 3D really can be extra dangerous as can low altitude high speed passes over the runway.. If you get a person who doesnt know their limits and they try to do too much, too low it can get extremely dangerous. There was a guy a few weeks ago with a 46% H9 Ultimate that thought he was a good enough 3D pilot to get low and right on the runway with a crowd at the field... He lost control and before he knew it the plane was flying about 3' off the ground right through a crowded pit area. It was an EXTREMLY close call.. The point is, its ok to get low and close.. But be please dont gamble.. Be sure you know EXACTLY what you are doing, how you are going to do it and when to do it. What you do when you are all alone or with a consenting buddy at the field is 1 thing, thats where you push the limits a little bit at a time. We all have to know our limits and stay within them,

If there is 1 thing about RC flying period.. not just 3D,,, its people who either dont know their limitations or just ignore them and try to go for it anyway.. A person should always know if they are in control,, and will be in control in 2-3-5 10 seconds. If you arent 100% sure then you need to get out of there, resituate yourself and start over.. Not only can you kill yourself but worse you can hurt or kill someone else.