opaqueice;214902 Wrote: > It's not about prediction - despite the symmetry, even golf ball dimples > are designed mostly by trial and error. It may be counterintutive, but > Tyler is right. Rough surfaces create a layer of turbulent air around > the object, and that often lowers the overall drag force.
Sorry, guys. I gotta call a BS on this. A rough surface increases drag. Dimples and other effects that control vortices can improve performance by managing air separation over the surface. On airplanes, we use vortex generators to do this. Dirt on a car or airplane slow it down. I once read a CAFE study that tried to determine the performance impact of waxing an airplane. They concluded there was none, but discovered about a 1% increase in top speed by removing bugs and dirt from all surfaces. -Ben -- Ben Diss 'SB3' (http://www.slimdevices.com/pi_squeezebox.html) -> 'Lavry DA10' (http://www.lavryengineering.com/productspage_da_10.html) -> 'BAT VK-31SE' (http://www.balanced.com/products/line/Vk-31SE/index.html) -> 'Halo A21' (http://www.parasound.com/halo/a21.php) -> 'B&W 803D' (http://www.bwspeakers.com/index.cfm/fuseaction/products.models/label/Model%20803D) ------------------------------------------------------------------------ Ben Diss's Profile: http://forums.slimdevices.com/member.php?userid=4289 View this thread: http://forums.slimdevices.com/showthread.php?t=36854 _______________________________________________ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
