Todd - you suggested that I try it under "real world" conditions... Well, I did. Extensively. I played with this bow with every conceivable arrow/weight/speed setup imaginable - and I documented everything. Fact is: If you understand what that simple ballistics calculator is telling you - it is dangerously close to the real world results.

Even after the arrow slows down, and the sight line comes into play - it's close. And that's what I'm getting at. The reason it's close - is Newton's Law of Falling Bodies. When we're talking about an arrow that's only in flight for a fraction of a second...the "real world" factors of wind drag, altitude, pressure, rain, fog- they really don't have much time to affect the flight. It's just too fast. It's not in a vacuum, but it might as well be.