# meanings of "NACA 64(2)-A015" digits

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 July 5, 2011, 03:17 meanings of "NACA 64(2)-A015" digits #1 Member   Join Date: Nov 2009 Posts: 65 Rep Power: 9 Dear all, Sorry for my basic question. I'm working in a wind turbine project and would like to optimize an airfoil of vertical axis wind turbine. As a start, I've heard the NACA 6 series were good initial profile. Thus, I modeled the profile of NACA 64(2)-A015 but some questions arose. Q1) Is there some function describing thickness distribution (y) along chord line(x) like yU=fU(x) and yL=fL(x) (upper and lower lines) for 6-digit series as exists for NACA 4 and 5 digit series ? Q2)Meanings of "64(2)-A015" As stated in Wikipedia, The number "6" indicating the 6 series. "4" digit describing the distance of the minimum pressure area in tens of percent of chord, i.e., 40% of chord. The subscript "(2)" digit gives the range of lift coefficient in tenths above and below the design lift coefficient in which favorable pressure gradients exist on both surfaces A hyphen. "A" ???? One digit "0" describing the design lift coefficient in tenths. Two digits "15" describing the maximum thickness in tens of percent of chord, i.e., 15% of chord Then, what the "A" digit means ? Regards, waku2005

 July 5, 2011, 11:48 #2 Senior Member   Join Date: Apr 2009 Posts: 129 Rep Power: 10

July 6, 2011, 04:52
#3
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Join Date: Nov 2009
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f-w

Thanks a lot !

waku2005

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