At 08:20 PM 6/21/2006, you wrote: >What makes the wheel pants a pressure recovery type?
It is based on the thickness profile of the airfoil. It is one way of describing a profile that will support the formation of a significant amount of laminar flow and minimize the formation of any airflow separation. Its point of maximum thickness is far back and the trailing edge tapers rapidly. In general terms, you can compare the shape of a NACA 63-015 to a NACA 66-015. The point of maximum thickness of the 66 series is much farther back than on the 63 series. At a Reynolds number of 3 Million, a 63-015 has a minimum coefficient of drag of 0.0060 and will go to approximately +/- 4 degrees angle of attack with no change in the drag. At the same Reynolds number, a 66-015 will have a minimum coefficient of drag of 0.0045 but will only go to approximately +/- 3 degrees angle of attack with no change in the drag. That means that a NACA 66-015 would be a much better basis for wheel pants than a NACA 63-015. Don Reid - donreid "at" peoplepc.com Bumpass, Va Visit my web sites at: AeroFoil, a 2-D Airfoil Design And Analysis Computer Program: http://aerofoilengineering.com KR2XL construction: http://aerofoilengineering.com/KR/KR2XL.htm Aviation Surplus: http://aerofoilengineering.com/PartsListing/Airparts.htm EAA Chapter 231: http://eaa231.org Ultralights: http://usua250.org VA EAA Regional Fly-in: http://vaeaa.org
