Wow ! was not expecting it to go 3 page ! But it is good read !!
I like a bit of diversion on topics - not too much to invite the thread locker (*ducks*) - but enough to keep it interesting. It is more fun !
I will have to check out Steve's picture when I get home. At work, the picture won't pull up.
As most of you already stated, the back pressure I am talking about is the wind rushing in from the side and back and hitting me. Someone in the older forum mentioned the vent on the Calci prevents the vacuum that causes this affect. And then there was someone else that cut some nice looking holes on a VStream and was pretty happy with the result.
On another note, I do not know my materials well - is the Cee Baily Acrylic or polycarbonate?