>> How know what the original name of the "KR-2S" wings airfoil?
The RAF48. See http://home.hiwaay.net/~langford/kraf48.html for details and coordinates. But the only valid reason I can see to use it would be because some government agency forces you to. Details on the "new wing" are at http://www.krnet.org/as504x/ . Mark Langford, Huntsville, Alabama see KR2S project N56ML at http://home.hiwaay.net/~langford email to N56ML "at" hiwaay.net
