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Message: [QUOTE="old man dave, post: 955205, member: 1009"] This is sorta correct, you are ignoring flow drag of fluids moving in a duct. Fluid near a duct wall is almost not moving, the fluid flow is only near the center of the duct only. So, real gains due to increased duct size is more than what the ratio of squares indicate. Drag surface varies by the increase in circumference, a linear function, the area with flow increases by the square. Picture a (as an example only) dead flow thickness of 1/32" in the tube. The area of dead flow increases linearly (C=pi xD)as the duct size goes up, the area of actual flow increases by the square (piR squared), the thickness of dead flow doesn't change much if at all with a duct size increase. You do the math. Actual flow increase is better than what your example says.:popcorn: [/QUOTE]

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