A PA28 pilot attempting a simulated soft field takeoff from a high altitude airport ran off the end of the runway into a corn field.

Narrative

In retrospect what I honestly feel caused the problem was my mind set that I have done this before and I can do it again. We were within weight and balance limits and takeoff performance limits. I even checked the field conditions. After configuring the airplane for soft field takeoff I started the takeoff roll; but should have aborted immediately at the first sign of a problem. Initial acceleration was a bit slow but soon after the airplane felt like it wanted to fly. My mind was only listening to the clues that pertained to taking off; not the ones telling me we would not make it. I got too focused on taking off. It is amazing how that mind set can creep into your brain so quickly and stay there and ignore reality. I always teach and talk about how the act of flying is not difficult; it is the decision making that gets people in trouble. My decision to continue on a takeoff roll and get so focused on taking off was the problem. As a CFI I have already incorporated more safety and decision making procedures into my teaching. I am also doing the same for me.