Realdo, 1.6kg is quite a good weight for a .40 size plane. After you've included your fuel tank, engine, radio gear, etc., I think your plane would weigh in at around 2.5kg, which is about 5.5 pounds. My Hobbicco trainer weighs about 6 pounds and my other .40 size planes range between 6 to 6.8 pounds. Hope this helps...