View Single Post
Old 07-19-2010, 09:09 PM   #4 (permalink)
EcoModding Lurker
Join Date: Apr 2010
Location: Santa Barbara, CA
Posts: 2
Thanks: 0
Thanked 0 Times in 0 Posts
air multiplier

Originally Posted by Rokeby View Post
Ok, they say more air moved through the ring than pumped in through
the base...
But who's to know?
What volume/pressure of air is being moved/pumped through the base?
It's the "pumped" thing... that requires energy,
and there has to be losses... no free lunch and all that.
How much energy in?
From what I understand it creates low pressure behind the fan to drawn in air (induction) and then the flow of the air out brings in more (entrainment). I'm not sure if the second part would help create force but the first might.

If not a car, then what about a hovercraft powered by a "bladeless fan"?
  Reply With Quote