Since I'm new to this site don't razz me to bad since I suck at any type of mathematical equasions. 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 is about 8' x 4' tall I will attach a picture. My question is how big of an I beam will I need before I get any deflection from lifting about 800lbs.? The I beam will be about 3-4' in the ground with a concrete base. The rest of the I beam will be above ground level and free standing at about 10' tall. I'm just not sure if a 8" I beam will be strong enough to hold what I'm trying to do. Here is the idea that I have.