I want to create a play structure for a super swing. A super swing is like a tire swing in that it can travel in all directions and spin like crazy. I used to have it on a tree branch but we moved to a house with no suitable limbs.
I was planning on using two 6x6x12 vertical posts set 2 feet deep in concrete with one 6x6x16 cross bar. I was going to use two diaginal pieces in the interior to help with any bowing.
I am mostly worried that the cross bar will break from the forces of the swing. I can set the posts deeper to reduce the forces (or if the depth is insufficient), but I would like to maintain the 10 feet above ground if possible.
Any other advice or suggestions appreciated.