Wow - even on iPad1

Great simulation, very fluid (pun intended) on iPhone5.
Works great on iPad1 as well.

Only drawback is that the screen boundaries are not detected properly, it varies on each machine... Please test and fix, this is essential for creating funnel type barriers that stretch all the way to the borders of the "tunnel" !!

Lars Baumstark about Wind Tunnel -- for iPad, v1.3.1