An ounce or three depending on the battery you choose. On a 20 pound jet there is probably 2 ounces of dead bugs on the leading edges. For ARF guys, Get a dremmel tool out and grind away that extra glue seeped out of over glued joints that isn't doing anything but riding along without a ticket, that's 6 ounces right there. Even on a Wren 44 powered model (and I don't think you can get auto start on something that small) 2 ounces will even be manageable I'd think. If it's too heavy, then it's too heavy somewhere else.