Whooooa there!
Just catching up on this very good thread and had to comment on something quite important: 1m/s equals 60m/min equals approx 200fpm in my head. The exact figure according to
Online conversions is 1 meter/second = 196.8503937 foot/minute. (Nice place for conversions by the way).
Oops, just read D3's post again and maybe he already took half away from it to get the critical Vi, in that case forget this post except the part about online conversions...
Cheers!
/2beers