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Old 10-21-2008, 10:21 PM
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Quote:
Originally Posted by Dad
I don't see any advantage in using double (aerofoil) vanes over single vanes. Anyone?
the aero foil (spelt wrong am sure ) type are used for higher pressure systems..
a single blade cannot stand the high air movement and buckles also the double bladed ones act like a airplane wing to decrease turbulance and get the air even smother..
they are also used in elbows where the depth of the elbow is just so large tht using a single just is not sturdy enough..
um.. thats bout all i can remember from school
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