Steve, I did that on my f18HT! It has a very low boom. I was crewing and on one tack I didn't duck low enough, when I went under the boom the outhaul block (near the forward boom, hung down just like the one pictured above) tore the back of my life jacket wide open! I had to buy a new jacket, the rip was so big that most of the foam flew overboard! It's so much easier to drive...