Recent content by _greg

I am trying to figure out how much thrust would be lost in redirecting it. I understand that that harrier jets redirect their thrust downwards to generate upward thrust but surely they lose some efficiency due to turbulence and friction inside the redirection duct. My question is how much is...

If a circular pipe with diameter 4ft has an airspeed of 100mph which then funnels through an orface(sp?) with diameter 2ft, what is is the air speed after the air passes though the hole? Any help would be very much appreciated. I am completely lost...