Like i said mine is 15.5 Dry. 1 servos per elevons. 2 Jr Extra 6V 1100mah pack + one 3 cells (3.6V) 1100mah for fuel pump, my Wren is hand start. I have the Big (heavy)Robart 630 with strut on it. So if you put lighter landing gears and LiPo cell you should be able to take down some weight, maybe 1 to 1.5 pounds...

As you see in the vids, it will take off in less than 300' even on a not so good grass field.