I have seen similar videos of flights of these type of 3-D models, and they have light weight streamers on each wing tip. Makes a great affect and lets you really see the corners on pullouts and such. You might think that on fast aileron rolls, while going that slow, they might wrap around the tail or at least get caught up some way, but they never seem to. Some have reversable pitch props, and dive to the floor and stop inches from the floor and back straight up until they can pull out forward again. That's pretty cool! Wish I could do that with my Park Zone Champ!
Type at you later,
Dan McEntee