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HOW CAN THAT BE POSSIBLE?. The combination of the steep leading edge angle, and material stiffness, enables the air to flow over the vane in a manner that actually creates lift and leaves the tip of each vane inside undisturbed air.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.