on that note, however, park flyers in my neck of the woods are the worst offenders of safety. they will launch a plane for the first time at a feild crowded with people enjoying the park. a dozen people will straddle a popular walkway flying their 3D foamies. they will fly above your head, buzzing like a killer bee. they will crash everywhere. they have no regard for "flight line" as they are almost always flying behind it around the pit area. more than once i've had an electric crash right next to me, one time hitting my friend in the back. luckily the injuries have been minor but they are a menace. i doubt any of them have any insurance. so while a park flyer may not need a failsafe, they do need the same respect for safety!