Originally posted by slade
yes its the coanda effect. 
. i did a report on that last year. it is what creates the lift from backspin, like with a flatline barrel, and is also what causes lift in an airplane, contrary to the popular beleif. you can prove the coanda effect if you take a thin strip of paper (like 1 cm by 10 cm) and create a curve in it, and then hold one end of it with the convex side up, and blow along the strip. the piece of paper will lift and straighten out. you can also test this by running the water in your sink, and touching the convex side of a spoon (or other curved object) to the falling water. this will cause the water to change course:
. i did a report on that last year. it is what creates the lift from backspin, like with a flatline barrel, and is also what causes lift in an airplane, contrary to the popular beleif. you can prove the coanda effect if you take a thin strip of paper (like 1 cm by 10 cm) and create a curve in it, and then hold one end of it with the convex side up, and blow along the strip. the piece of paper will lift and straighten out. you can also test this by running the water in your sink, and touching the convex side of a spoon (or other curved object) to the falling water. this will cause the water to change course: The water's path in that pic can be more attributed to its properties of cohesion, coanda effect aside.
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