...my ARF (with a bunch of added tail weight) weighs around 4 lb. 13-14oz. - i didn't seal the hinges, but there's very little gap - Dubro 2-56 linkages - i have a lot of throw...but i'm getting flutter at half throttle, neutral ailerons...

...maybe it's just vibration, but it sounds like flutter - not even a hard landing yet...but i'll check for broken glue joints - except for vertical, i fly it only at low throttle settings...