Please help. I made a swing for my kids and now am wondering how safe it is. The swing beam is pressure treated yellow pine 4x6 and 16 feet long. The swing hangers are attached to the 4 inch side of the wood. At one end it sits in a deck bracket on top of a 4x4 attached to a fort. The other end sits on a horizontal beam of an A frame attached with brackets and lag screws.This A frame is placed 12 feet from the fort portion so that the other 4 ft of beam extends past the A frame. There are 3 swing stations and then a trapeze on the far end past the A frame.
My concern is that when my 60lb kid uses the swings I notice "bounce" of the beam. The center of the beam visibly moves though the attached points at fort and a frame do not seem to move at all. Is this safe? Thanks so much.