I wonder how big of a payload you could carry if you made a plane like that on a larger scale...
I was thinking about getting an X8.
Check out our Hairfire FPV Delta wing--> http://www.youtube.com/watch?feature=player_embedded&v=-jMXskhhw7E
It has a 48" wingspan and is designed to carry a 2lb payload.
Included in the Kit:
· 48 inch Wing Cores with Wing Shucks
·  G-10 Fiberglass Spars
· Pre-Cut 132 inches ³ Payload Area
· Magnetically Secured Hatch Cover
· Balsa Wing Trailing Edge
· Balsa Wing Tip Plates
·  Balsa Stabilizer Fins
· Tractor Motor Mount (made to fit Rimfire.25 4240 1000 Brushless Outrunner or similar)
·  Nylon Motor Mount Bolts