This my cheapest flying wing i got from Hobby King for jus $20 as a kit.  Extemely tank durable because its made from elastic impact resistant EPP foam and super simple electronics setup on aboard.  Hand launched i can glide all day and soaring above the coastal sea on just 2s 1000mah 20c lipo battery pack.  I fly it during my lazy days, lol.  Before the UAV Z-84 this was my first attempt to build autonomous flying wing on APM but didn't work out well.  So i just stick it as normal setup for normal fun flying.

photo