I was just browsing the forum when I saw this thread and felt compelled to point out a fact that everybody here disappointingly seems to have missed. Thus, I registered and here I am!
The fact that I would like to point out is that
a skydive simulator using wind/fans cannot in any way ever convincingly simulate free fallMy reasoning is as follows,
In sky-diving, or the simulation thereof, you do not simply "float around". Sky-diving is not easy, and it takes training to do it safely. The most minor twist in your angle compared to the wind will cause you to move, in some cases dangerously so. For those without the power of imagination to simulate the case I describe, let me show you:
Case 1: A man in virtual free fall. He's fine, everything works, doesn't it? No, because now we move down to..
Case 2: The man shifts his angle 45 degrees, the air presses against him in a wildly different fashion and he slams into the wall. Ouch. I wonder what would happen were he to shift a further 45 degrees..
Case 3: If you will forgive the comical interpretation, I should say that it's obvious that free fall simply cannot be simulated in this fashion

If we take another case, where he is in effective free-fall when horizontal, if he shifts his angle 90 degrees he would simply fall down to either get hacked to pieces by the fan mechanism, or if security measures were in place, fall down onto the fan and consequently feel gravity when he isn't supposed to.
It comes to mind that you might then point out that you could simply have the entire simulation capsule in free-fall, but this is not the case either. The only way to do that would be to have the capsule fall for several minutes uninterrupted either by dropping it from very high up, or dropping it down a very, very deep hole. Of course, I shouldn't have to explain why neither of these are even remotely feasible.