Aerodynamics / Aerodynamic Cost / Aero parts

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hippy in reply to @Bugno

http://www.racecar-engineering.com/articles/technology/can-dimpled-aerodynamic-surfaces-reduce-drag/

http://www.aerospaceweb.org/question/aerodynamics/q0215.shtml

"The reason we do not see dimples on other shapes, like wings, is that these particular forms of boundary layer trips only work well on a blunt body like a sphere or a cylinder. The most dominant form of drag on these kinds of shapes is caused by pressure, as we have seen throughout this discussion. More streamlined shapes like the airfoils used on wings are dominated by a different kind of drag called skin friction drag."

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Bugno in reply to @hippy

Thanks, what I had in mind was cylindrical objects like seatposts and tyres but I guess a small fairing behind them like in aero seatposts and high profile wheels solves the problem much more efficiently. What about dimpled brake cables though? ;)

Dimpled legs anyone?

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svenhöek in reply to @Bugno

Dimples need a certain size/speed to work (just under the critical spot where drag changes dramatically)

I put cinelli bumpy tape on my road bars and tried to calculate if it helps :) With 2mm bumps on a 3cm cylinder going 20-40km/h they are just outside the range that actually works.

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