I would have to agree with this statement. I have not actually stabbed ribs, but I have shot wide bladed arrows clean through many deer during hunts over the years...and I recall after dressing them out one could actually see very clean slice-through on the ribs where the arrow entered. That was very thin and relatively fragile (compared to a sharp sword) blades that had no issues with parting bone as cleanly as flesh. And remember, that little blade only had a mere 50-60 ft. pounds of force behind it. Besides, if you look at the manuals lots of the thrusts (like in Talhoffer) show the blades in position not to access ribs, but winding in all sorts of positions to get the technique to the opponent. Blade orientation seems more a function of connecting rather than penetrating after the connection. Living bone is different than dead, hardened up stuff.
Stacy Clifford wrote:We did some test cutting on a fresh deer carcass here a few years ago, which was set up hanging from a post. John was there and picked up my type XIV (Del Tin I think, but I got it second hand and there's no maker's mark) and did a thrust at the deer's chest perpendicular to the ribs. This sword is not particularly sharp, and John did not put a great deal of force into the thrust, just extended his arm and stepped forward. It passed all the way through and out the other side going in almost to the hilt, severing three or four ribs on the near side and leaving a stab wound the width of my four fingers together. My conclusion: ribs don't count as armor. Just connect, the blade will do its job.
Rod W. Thornton, Scholar Adept (Longsword)
ARMA-Virginia Beach Study Group