So just weighed mine (the one above in Dave's photos) and its 12.6kg or 27.7 pounds with a Jetcat 130, that's uat full and tiny bit of fuel in the sump of the main tank, I have now put my retract battery (850ma) in the front tray, turbine battery on main tank and needed 75g of lead at the front to balance at 400mm, once test flown will teak as needed.