Thats a start but we had a 40 size trainer come in dead stick and ended up hitting the door of a members pickup. I was suprised at the size of the dent. What if that were some unsuspecting kid getting hit in the back of the head? The kid would not even hear it coming just gliding like that and it was stated that where the kids fly it is downhill from the field so the pilot may not even be able to see where his plane going.