Well you bring some information that I didn't think about. As for the arm swing it will rotate 180º and after pricing I beams at $2400 for a 20 foot length I think that an I beam is out of the equasion.
So what I'm thinking is a 6 X 6 square tubing 3/8" thick with some reinforcements along...
Since I'm new to this site don't razz me to bad since I suck at any type of mathematical equations.
Anyways, I am building a "Jib" arm and was planning on putting an I beam in the ground with concrete. Although the I beam will have to be free standing and about 10' tall. The "jib" arm...