I built it from two Tower kaos 40 kits. Alot of modifying other then combining them to make them look like the old Bridi kaos's. Any way they have old OS .46 SF's one counterrotating, one normal. One set of radio gear in each fuse (one aileron, elevator, rudder, and throttle servos and battery switch reciever in each fuse). Flys excellent. It's 7, 8, or so years old and has hundreds of flights on it.