The Subsoiler frame is angled back 45 degrees so it requires less horespower, less fuel, and allows travel at a faster speed. The first shank cracks and lifts the ground. The second shanks break up the ground partilay cracked by the first shank. The third shanks break up the ground that was cracked by the second shanks, ...and so on. The forward rows of shanks break up the ground for the row behind them, similar to geese flying in a "V" formation to break up the air resistance for each other.
In the fall you might see geese heading south for the winter flying along in the "V" formation. The goose in front breaks the wind for the goose to the side and behind. As each bird flaps its wings, it creates an uplift for the bird following.  By flying in a "V" formation, the whole flock adds at least 71% greater flying range than if each bird flew on its own.