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Message: <blockquote data-quote="fabianyee" data-source="post: 297258" data-attributes="member: 6">it does work to a certain extent...swirling of air flow increase the effective speed provided the angle of flow is worked out correctly... Just like they design the gun barrel to spin the bullet as it go thru the barrel.. And how the feather on the arrow spins the arrow as it go thru the air... Why the manufacturer do not use them.. Bcos they want to avoid the liability if the device breaks.. Imagine they sell cars in the hundreds of thousands.. even if there's 1 percent failure, that's a lot of cars affected... Less components, less headaches...However, I'm not saying it's a good product just that it does work to a certain extent . Just a matter of whether it's worth the money for a seemingly simple device...</blockquote>