it's second hand airplane, originally it flew with webra bully 120 so i guess the weight was 10lb but since i am going to put the SAP-180 and also my dual battery NICD packs it will be 11lb. i am F3A sport flier and my only concern is first time to have real unlimited vertical ability. after 27 years in the hobby i puting my hopes on the SAP.... i guess 1lb should have no real problem to achive my goal....