This isn't quite radio control, but it's the closest newsgroup I could think of. Please bear with me.
I recently heard about some people that work with museums (and the like) and kids. They have the kids build simple airplanes from wood. Then an electric motor/battery is mounted on the airplane. Two kids fly and try and try crash into each other. The motors/batteries are then switch to the next pair of planes. Supposedly done indoors.
Not the normal use for model airplanes, but I wasn't wondering if anybody had heard of this or could provide me with pointers to any further information?